{"id":38153,"date":"2026-01-15T18:49:01","date_gmt":"2026-01-15T10:49:01","guid":{"rendered":"https:\/\/pcbcool.com\/?p=38153"},"modified":"2026-01-16T19:57:04","modified_gmt":"2026-01-16T11:57:04","slug":"field-guide-to-identifying-unknown-smd-components-on-pcb","status":"publish","type":"post","link":"https:\/\/pcbcool.com\/fr\/technical-guides\/field-guide-to-identifying-unknown-smd-components-on-pcb\/","title":{"rendered":"Guide de terrain pour l'identification des composants CMS inconnus sur PCB"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"38153\" class=\"elementor elementor-38153\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-6bff3ff e-flex e-con-boxed e-con e-parent\" data-id=\"6bff3ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-6abee4e e-con-full e-flex e-con e-child\" data-id=\"6abee4e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-de789ba color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"de789ba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>In 2024, I was called to troubleshoot a failed irrigation controller in Nakuru, a town in Kenya. The board had no schematic, no labels, and a charred 6-pin IC with only \u201cK17\u201d visible. The local technician had already replaced it with a \u201csimilar\u201d part, and ended up frying the microcontroller.<\/p><p>This isn\u2019t rare. Across East Africa, <strong>many field repairs involve unknown or misidentified components<\/strong>\u2014not because engineers lack skill, but because modern SMD parts often omit full part numbers, use cryptic codes, or are outright counterfeits.<\/p><p><em>You can\u2019t fix what you can\u2019t identify or understand.<\/em><\/p><p>This guide delivers a systematic identification protocol\u2014not just \u201cresistor = stripes,\u201d but how to decode:<\/p><ul><li>3-letter SOT-23 codes with no datasheet<\/li><li>Burnt components with zero markings<\/li><li>Fake ICs with swapped logos<\/li><li>Unmarked passives in 0201 packages<\/li><\/ul><p>No guesswork. Just forensic techniques that work in dusty workshops, humid labs, and under deadline pressure.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b8d21b1 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"b8d21b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Identification Hierarchy<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-57808ea color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"57808ea\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Never start with a multimeter\u2014start with context:<\/p><ol><li><em>Package Type<\/em> \u2192 Narrows the possibilities to roughly 10\u201350 functions<\/li><li><em>Position on Board<\/em> \u2192 Reveals likely role (e.g., near USB = ESD protection)<\/li><li><em>Markings<\/em> \u2192 Even partial codes can often be matched<\/li><li><em>Circuit Topology<\/em> \u2192 Adjacent components hint at function<\/li><li><em>Failure Symptom<\/em>s \u2192 Shorted? Open? Thermal damage?<\/li><\/ol><p><strong>Real Win:<\/strong><\/p><p>A \u201cmystery\u201d 5-pin chip near a 24\u202fV rail was identified as a current sense amplifier (TI INA180), not a voltage regulator, because it sat between a shunt resistor and an ADC.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5afd5a wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"d5afd5a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Decoding SMD Marking Systems (The 5 Code Families)<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3feae81 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"3feae81\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">1. SMD Resistors (0201 to 2512)<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d1c771 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"6d1c771\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><em>3-Digit Code:<\/em> First two = value, third = multiplier (e.g., 103 = 10 \u00d7 10\u00b3 = 10\u202fk\u03a9)<\/li><li><em>4-Digit Code (1% tolerance):<\/em> 4701 = 470 \u00d7 10\u00b9 = 4.7\u202fk\u03a9<\/li><li><em>\u201cR\u201d for Decimal:<\/em> R47 = 0.47\u202f\u03a9, 4R7 = 4.7\u202f\u03a9<\/li><\/ul><p><strong>Caution:<\/strong><\/p><p>Burnt resistors change value. Always de-solder one leg before measuring.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bd59138 elementor-widget elementor-widget-image\" data-id=\"bd59138\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"597\" height=\"386\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SMD-Resistor-Code-Chart-3-Digit-4-Digit-and-R-Notation.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38171\" alt=\"SMD Resistor Code Chart 3 Digit, 4 Digit, and \u201cR\u201d Notation\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SMD-Resistor-Code-Chart-3-Digit-4-Digit-and-R-Notation.jpg 597w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SMD-Resistor-Code-Chart-3-Digit-4-Digit-and-R-Notation-150x97.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SMD-Resistor-Code-Chart-3-Digit-4-Digit-and-R-Notation-400x259.jpg 400w\" sizes=\"auto, (max-width: 597px) 100vw, 597px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 1: SMD Resistor Code Chart -3-Digit, 4-Digit, and \u201cR\u201d Notation<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-53a45fd wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"53a45fd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">2. SMD Capacitors (Mostly Unmarked)<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9882755 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"9882755\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>95% of ceramic capacitors have no markings. Identification relies on:<\/p><ul><li><em>Package Size:<\/em> 0402 \u2248 0.01\u20131\u202f\u00b5F; 1206 \u2248 1\u2013100\u202f\u00b5F<\/li><li><em>Color:<\/em> Brown \u2248 X7R; Gray \u2248 C0G\/NP0 (typical, not absolute)<\/li><li><em>Location:<\/em><ul><li>Near IC VCC \u2192 decoupling (0.1\u202f\u00b5F typical)<\/li><li>In power path \u2192 bulk (10\u2013100\u202f\u00b5F)<\/li><\/ul><\/li><\/ul><p><strong>Pro Tip:<\/strong><\/p><p>Use an LCR meter at operating frequency\u2014capacitance can drop under high bias.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-44da746 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"44da746\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">3. SMD Diodes &amp; Zeners<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-203c381 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"203c381\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><em>Marking:<\/em> Cathode band + code (e.g., M7 = 1N4007, BZ = BZV55-C3V3)<\/li><li><em>SOD-323\/SOD-523:<\/em> Often just a color dot or letter<\/li><li><em>TVS\/ESD Diodes:<\/em> CM12, SRV05\u2014look for symmetrical placement on data lines<\/li><\/ul><p><strong>Failure Signs:<\/strong><\/p><p>Shorted diode = low \u03a9 in both directions; Open = infinite \u03a9<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b529680 elementor-widget elementor-widget-image\" data-id=\"b529680\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"464\" height=\"349\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Common-SMD-Diode-Markings.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38181\" alt=\"Common SMD Diode Markings\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Common-SMD-Diode-Markings.jpg 464w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Common-SMD-Diode-Markings-150x113.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Common-SMD-Diode-Markings-400x300.jpg 400w\" sizes=\"auto, (max-width: 464px) 100vw, 464px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 2: Common SMD Diode Markings<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7da38f7 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"7da38f7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">4. Transistors &amp; MOSFETs (SOT-23, SOT-223)<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4ea27b3 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"4ea27b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>This is where engineers often get stuck. A 3-pin SOT-23 marked 1A could be:<\/p><ul><li>BC847 (NPN)<\/li><li>PMBT3904 (NPN)<\/li><li>DMG2307 (P-channel MOSFET)<\/li><\/ul><p><strong>Resolution Protocol:<\/strong><\/p><ol><li><em>Check Pinout:<\/em><ul><li>B-C-E = bipolar<\/li><li>G-D-S = MOSFET<\/li><\/ul><\/li><li><em>Measure In-Circuit:<\/em><ul><li>Bipolar: ~0.6\u202fV B-E drop<\/li><li>MOSFET: Diode drop D-S, G = open<\/li><\/ul><\/li><li><em>Use SMD Codebook:<\/em><ul><li>Cross-reference with SMD Code Finder (offline database)<\/li><\/ul><\/li><\/ol><p><strong>Critical:<\/strong><\/p><p>Many MOSFETs use manufacturer-specific codes\u2014for example, K17 corresponds to AO3401A from Alpha &amp; Omega.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-02d18d1 elementor-widget elementor-widget-image\" data-id=\"02d18d1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"679\" height=\"292\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SOT-23-Pinout-Variants-Bipolar.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38182\" alt=\"SOT 23 Pinout Variants Bipolar\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SOT-23-Pinout-Variants-Bipolar.jpg 679w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SOT-23-Pinout-Variants-Bipolar-150x65.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SOT-23-Pinout-Variants-Bipolar-600x258.jpg 600w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/SOT-23-Pinout-Variants-Bipolar-400x172.jpg 400w\" sizes=\"auto, (max-width: 679px) 100vw, 679px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 3: SOT-23 Pinout Variants -Bipolar<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0503ca6 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"0503ca6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">5. ICs (SOIC, TSSOP, QFN)<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7446a33 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"7446a33\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><em>Full Part Number:<\/em> Best case (e.g., LM358DR)<\/li><li><em>Top-Mark Code:<\/em> 2\u20135 characters + date code (e.g., L358 + 2412)<\/li><li><em>No Markings:<\/em> Common on QFNs\u2014use X-ray or decap (not DIY)<\/li><\/ul><p><strong>Pro Method:<\/strong><\/p><ul><li>Search \u201cmarking [code] site:alldatasheet.com\u201d<\/li><li>Or use Octopart SMD Marking Search (offline cache recommended)<\/li><\/ul><p><strong>Case Study:<\/strong><\/p><p>K17 on 6-pin SOT-23-6 \u2192 AO3401A P-MOSFET, confirmed by gate threshold test<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ff404e elementor-widget elementor-widget-image\" data-id=\"8ff404e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"598\" height=\"399\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/IC-Marking-Anatomy-Decoding-Date-Codes-Lot-Numbers-and-Top-Marks.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38183\" alt=\"IC Marking Anatomy Decoding Date Codes, Lot Numbers, and Top Marks\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/IC-Marking-Anatomy-Decoding-Date-Codes-Lot-Numbers-and-Top-Marks.jpg 598w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/IC-Marking-Anatomy-Decoding-Date-Codes-Lot-Numbers-and-Top-Marks-150x100.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/IC-Marking-Anatomy-Decoding-Date-Codes-Lot-Numbers-and-Top-Marks-400x267.jpg 400w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 4: IC Marking Anatomy -Decoding Date Codes, Lot Numbers, and Top Marks<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b02fa4e wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"b02fa4e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Identifying Burnt SMD Components<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2e8245c wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"2e8245c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">Resistors \/ Capacitors<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4f6a300 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"4f6a300\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><em>Resistor:<\/em> Charred or blackened\u2014value may increase; always measure out of circuit.<\/li><li><em>Capacitor:<\/em> Bulging, cracked, or vented \u2192 always replace (mainly applies to electrolytic or tantalum types).<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-36b7a77 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"36b7a77\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">ICs \/ Transistors<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f56063e color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"f56063e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li><em>Note Package and Pin Count<\/em><\/li><li><em>Check Surrounding Circuit:<\/em><ul><li>If near motor \u2192 likely H-bridge or MOSFET<\/li><li>If near VCC \u2192 likely regulator or supervisor<\/li><\/ul><\/li><li><em>Trace Power Path:<\/em> Identify input and output pins \u2192 deduce function<\/li><li><em>Assume Worst-Case Specs:<\/em> Replace with higher voltage\/current rating<\/li><\/ol><p><strong>Field Hack:<\/strong><\/p><p>Use a thermal camera (or IR thermometer) on a powered good board\u2014hotspots reveal regulators and drivers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0bbbacf elementor-widget elementor-widget-image\" data-id=\"0bbbacf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"715\" height=\"482\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Components-on-the-PCB-Were-Completely-Burned-Through.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38193\" alt=\"Components on the PCB Were Completely Burned Through\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Components-on-the-PCB-Were-Completely-Burned-Through.jpg 715w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Components-on-the-PCB-Were-Completely-Burned-Through-150x101.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Components-on-the-PCB-Were-Completely-Burned-Through-600x404.jpg 600w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Components-on-the-PCB-Were-Completely-Burned-Through-400x270.jpg 400w\" sizes=\"auto, (max-width: 715px) 100vw, 715px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 5: Components on the PCB Were Completely Burned Through<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b3ffcdd wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"b3ffcdd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">How to Spot Fake Components<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3c9a24e color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"3c9a24e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>In 2025, an internal audit estimated that 22% of low-cost dev boards in Nairobi contained fake or remarked ICs (JKUAT). Red flags:<\/p><table><thead><tr><th>Sign<\/th><th>Real Part<\/th><th>Fake Part<\/th><\/tr><\/thead><tbody><tr><td>Marking depth<\/td><td>Laser-etched (smooth)<\/td><td>Ink-printed (smudges with IPA)<\/td><\/tr><tr><td>Pin finish<\/td><td>Matte tin<\/td><td>Shiny (often leaded)<\/td><\/tr><tr><td>Date code<\/td><td>Matches production<\/td><td>Future date (e.g., \u201c2548\u201d in 2025)<\/td><\/tr><tr><td>Package alignment<\/td><td>Precise mold lines<\/td><td>Crooked logo, offset markings<\/td><\/tr><\/tbody><\/table><p><strong>Tests:<\/strong><\/p><ul><li><em>Curve Tracer:<\/em> Fake MOSFETs show soft breakdown<\/li><li><em>LCR Meter:<\/em> Fake capacitors have wrong capacitance or high ESR<\/li><\/ul><p><strong>Pro Insight:<\/strong><\/p><p>Buy only from authorized distributors (Mouser, Digi-Key, LCSC)\u2014never AliExpress for critical parts.<\/p><p>For commercial projects, using a <a href=\"https:\/\/pcbcool.com\/services\/component-sourcing\/\">professional component sourcing service<\/a> such as PCBCool\u2019s component procurement can further reduce risk while leveraging volume purchasing to lower overall costs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4dd1fc9 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"4dd1fc9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Package Anomalies That Fool Engineers<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1fe69f wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"d1fe69f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">\u201cSOIC-8\u201d Isn\u2019t Always SOIC-8<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1b701b1 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"1b701b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li><em>Microchip:<\/em> Uses NS suffix = narrow SOIC (150\u202fmil)<\/li><li><em>TI:<\/em> Uses D = standard SOIC (300\u202fmil)<\/li><\/ul><p><strong>Caution:<\/strong><\/p><p>Same footprint, different width \u2192 won\u2019t fit socket<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ec073bf wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"ec073bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">0805 vs. 0806 Capacitors<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8cff679 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"8cff679\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>Visually identical\u2014but 0806 has a higher voltage rating<\/li><li>Swapping can cause field failures<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c4c229f wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"c4c229f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-medium text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h3 class=\"woodmart-title-container title wd-fontsize-xl\">QFN with Exposed Pad<\/h3> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-79847f5 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"79847f5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ul><li>Must be soldered to GND plane<\/li><li>If left floating \u2192 thermal runaway<\/li><\/ul><p><strong>Pro Tip:<\/strong><\/p><p>Always check the mechanical drawing in the datasheet\u2014not just the pinout<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-952dea3 elementor-widget elementor-widget-image\" data-id=\"952dea3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"598\" height=\"329\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Package-Dimension-Comparison-SOIC-Narrow-vs.-Wide-Caliper-Measurement.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-38203\" alt=\"Package Dimension Comparison SOIC Narrow vs. Wide (Caliper Measurement)\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Package-Dimension-Comparison-SOIC-Narrow-vs.-Wide-Caliper-Measurement.jpg 598w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Package-Dimension-Comparison-SOIC-Narrow-vs.-Wide-Caliper-Measurement-150x83.jpg 150w, https:\/\/pcbcool.com\/wp-content\/uploads\/2026\/01\/Package-Dimension-Comparison-SOIC-Narrow-vs.-Wide-Caliper-Measurement-400x220.jpg 400w\" sizes=\"auto, (max-width: 598px) 100vw, 598px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Figure 6: Package Dimension Comparison - SOIC Narrow vs. Wide (Caliper Measurement)<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e89fc35 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"e89fc35\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">5-Step Field Identification Protocol<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9a4470a color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"9a4470a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<ol><li><em>Capture:<\/em> Take a photo and note the package, pins, markings, and location<\/li><li><em>Isolate:<\/em> De-solder if possible\u2014or use in-circuit diode test<\/li><li><em>Contextualize:<\/em> Determine what it\u2019s connected to\u2014Power? Signal? Ground?<\/li><li><em>Cross-Reference:<\/em> Use offline SMD code database and circuit topology<\/li><li><em>Verify:<\/em> Replace with a known-good part; test function\u2014not just resistance<\/li><\/ol><p><strong>Golden Rule:<\/strong><\/p><p>If you\u2019re unsure, don\u2019t power the board. A misidentified MOSFET can take down a $200 processor.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e5baa3 wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"5e5baa3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Final Thoughts<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7bbfb84 color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"7bbfb84\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Identifying components isn\u2019t about memorizing codes\u2014it\u2019s about thinking like a failure. Every marking, every footprint, every scorch mark tells a story of voltage stress, thermal overload, or supply chain risk.<\/p><p>The best field engineers don\u2019t just read labels\u2014they interrogate the board, question assumptions, and verify before they act.<\/p><p>Because in hardware, a wrong guess doesn\u2019t just waste time\u2014it destroys evidence, burns components, and erodes trust. Know what you\u2019re replacing. Or don\u2019t replace it at all.<\/p><p>When you work with <a href=\"https:\/\/pcbcool.com\/\">PCBCool<\/a>, you don\u2019t have to guess. Our expert sourcing, verified components, and <a href=\"https:\/\/pcbcool.com\/services\/pcb-assembly\/\">PCBA assembly support<\/a> ensure that every part is genuine, properly rated, and ready for your project\u2014so you can focus on design and troubleshooting without risking burned boards or failed prototypes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"wd-negative-gap elementor-element elementor-element-6fb8fca e-flex e-con-boxed e-con e-parent\" data-id=\"6fb8fca\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9c373aa wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"9c373aa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-primary wd-title-style-underlined wd-title-size-large text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<h2 class=\"woodmart-title-container title wd-fontsize-xxl\">Frequently Asked Questions (FAQ)<\/h2> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f3571ad e-con-full e-flex e-con e-child\" data-id=\"f3571ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-1bb72fd e-con-full e-flex e-con e-child\" data-id=\"1bb72fd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a8ce272 elementor-widget elementor-widget-wd_accordion\" data-id=\"a8ce272\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t<div class=\"wd-accordion wd-style-default wd-titles-left wd-opener-pos-left wd-opener-style-arrow\" data-state=\"first\">\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn wd-active\" data-accordion-index=\"0\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ1: How Can I Tell If an SMD Component Is Counterfeit Without a Lab?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content wd-active\" data-accordion-index=\"0\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Look for inconsistent markings, unusual pin finishes, crooked logos, or mismatched date codes.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"1\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ2: Can a Burnt Resistor Still Be Accurately Measured In-Circuit?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"1\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Usually not\u2014burnt resistors can drift or open.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"2\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ3: How Do I Distinguish Between Similar-Looking SMD Capacitors?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"2\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Check package size, color code, location in the circuit, and measure with an LCR meter at operating frequency.vallis torquent elit accumsan eu est pulvinar pretium congue a vestibulum suspendisse scelerisque condimentum parturient quam.Aliquet faucibus condimentum amet nam a nascetur suspendisse habitant a mollis senectus suscipit a vestibulum primis molestie parturient aptent nisi aenean.A scelerisque quam consectetur condimentum risus lobortis cum dignissim mi fusce primis rhoncus a rhoncus bibendum parturient condimentum odio a justo a et mollis pulvinar venenatis metus sodales elementum.Parturient ullamcorper natoque mi sagittis a nibh nisi a suspendisse a.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"3\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ4: What Tools Are Essential for Field Identification of Unknown SMD Parts?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"3\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Digital microscope, LCR meter, multimeter, curve tracer, thermal camera, and offline SMD code database.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"4\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ5: How Important Is Circuit Context in Identifying a Component?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"4\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Extremely. Connections to power, ground, or signal paths often reveal a component\u2019s function faster than markings.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8d5ce1b e-con-full e-flex e-con e-child\" data-id=\"8d5ce1b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2ef7d32 elementor-widget elementor-widget-wd_accordion\" data-id=\"2ef7d32\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\n\t\t<div class=\"wd-accordion wd-style-default wd-titles-left wd-opener-pos-left wd-opener-style-arrow\" data-state=\"first\">\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn wd-active\" data-accordion-index=\"0\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ6: Can a 3-Pin SOT-23 Component Be Both a Transistor and a MOSFET?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content wd-active\" data-accordion-index=\"0\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Yes. Pinout, in-circuit voltage drop tests, and code cross-referencing are needed to differentiate.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"1\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ7: How Do I Avoid Damaging a Board While Testing Unknown Components?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"1\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Follow the 5-step field identification protocol: capture, isolate, contextualize, cross-reference, verify. Never power the board if uncertain.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"2\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\t Q8: How Reliable Are Manufacturer Top-Mark Codes?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"2\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: They\u2019re usually accurate, but some MOSFETs or ICs use manufacturer-specific codes, and counterfeits may copy them. Cross-check with datasheets or codebooks.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"3\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ9: How Can I Verify the Rating of an Unknown Capacitor?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"3\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: Measure capacitance with an LCR meter at operating frequency, and check voltage rating from package size and location context.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"4\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ10: Is Memorizing SMD Codes Necessary?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"4\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: No. Understanding code families, package types, and functional context is more effective than memorization.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"wd-accordion-item\">\n\t\t\t\t\t<div class=\"wd-accordion-title wd-role-btn\" data-accordion-index=\"5\" tabindex=\"0\">\n\t\t\t\t\t\t<div class=\"wd-accordion-title-text\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span>\n\t\t\t\t\t\t\t\tQ11: Are Thermal Patterns Reliable for Component Identification?\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<span class=\"wd-accordion-opener\"><\/span>\n\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<div class=\"wd-accordion-content wd-entry-content\" data-accordion-index=\"5\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<p>A: They are helpful. On a powered board, hotspots reveal regulators, drivers, or faulty parts, but don\u2019t rely on them alone.<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6c6ce4 elementor-widget elementor-widget-shortcode\" data-id=\"c6c6ce4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t\t<link rel=\"stylesheet\" id=\"elementor-post-35582-css\" href=\"https:\/\/pcbcool.com\/wp-content\/uploads\/elementor\/css\/post-35582.css?ver=1783499759\" type=\"text\/css\" media=\"all\">\n\t\t\t\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"35582\" class=\"elementor elementor-35582\" data-elementor-post-type=\"cms_block\">\n\t\t\t\t<div class=\"wd-negative-gap elementor-element elementor-element-f6159f8 e-flex e-con-boxed e-con e-parent\" data-id=\"f6159f8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-a03266c e-con-full e-flex e-con e-child\" data-id=\"a03266c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-09accce e-con-full e-flex e-con e-child\" data-id=\"09accce\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-773405d elementor-widget elementor-widget-image\" data-id=\"773405d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"250\" height=\"250\" src=\"https:\/\/pcbcool.com\/wp-content\/themes\/woodmart\/images\/lazy.svg\" data-src=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2025\/12\/George.jpg\" class=\" wd-lazy-fade attachment-full size-full wp-image-35271\" alt=\"George\" srcset=\"\" data-srcset=\"https:\/\/pcbcool.com\/wp-content\/uploads\/2025\/12\/George.jpg 250w, https:\/\/pcbcool.com\/wp-content\/uploads\/2025\/12\/George-150x150.jpg 150w\" sizes=\"auto, (max-width: 250px) 100vw, 250px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-39912a8 e-con-full e-flex e-con e-child\" data-id=\"39912a8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b1b555d wd-width-100 elementor-widget elementor-widget-wd_title\" data-id=\"b1b555d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"wd_title.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"title-wrapper wd-set-mb reset-last-child wd-title-color-default wd-title-style-default wd-title-size-default text-left\">\n\n\t\t\t\n\t\t\t<div class=\"liner-continer\">\n\t\t\t\t<div class=\"woodmart-title-container title wd-fontsize-l\">George | Electrical Engineer and Embedded Systems Specialist<\/div> \n\t\t\t\t\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0a641fa e-con-full e-flex e-con e-child\" data-id=\"0a641fa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d15406f color-scheme-inherit text-left elementor-widget elementor-widget-text-editor\" data-id=\"d15406f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>George is a certified electrical engineer with experience in PCB design, embedded systems, and IoT hardware development. He works with PCBCool to turn real engineering experience into practical guides for developers and engineers.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b70a6bd elementor-widget elementor-widget-html\" data-id=\"b70a6bd\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<div class=\"custom-btn-wrapper\">\r\n  <a href=\"https:\/\/pcbcool.com\/author\/george\/\" class=\"custom-btn\">Read More Articles by George \u2192<\/a>\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Guide pratique pour l'identification des composants CMS inconnus sur les circuits imprim\u00e9s. Apprenez \u00e0 d\u00e9coder les marquages, \u00e0 analyser les types de bo\u00eetiers, \u00e0 d\u00e9panner les composants br\u00fbl\u00e9s, \u00e0 rep\u00e9rer les composants contrefaits et \u00e0 appliquer des techniques \u00e9prouv\u00e9es sur le terrain pour une identification pr\u00e9cise.<\/p>","protected":false},"author":8,"featured_media":38218,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"slim_seo":{"title":"Guide de terrain pour l'identification de composants CMS inconnus sur PCB | PCBCool","description":"Guide pratique pour l'identification des composants CMS inconnus sur les circuits imprim\u00e9s. Apprenez \u00e0 d\u00e9coder les marquages, \u00e0 analyser les types de bo\u00eetiers, \u00e0 d\u00e9panner les composants br\u00fbl\u00e9s, \u00e0 rep\u00e9rer les composants contrefaits et \u00e0 appliquer des techniques \u00e9prouv\u00e9es sur le terrain pour une identification pr\u00e9cise."},"footnotes":""},"categories":[113],"tags":[],"post_folder":[],"class_list":["post-38153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-guides"],"_links":{"self":[{"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/posts\/38153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/comments?post=38153"}],"version-history":[{"count":0,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/posts\/38153\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/media\/38218"}],"wp:attachment":[{"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/media?parent=38153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/categories?post=38153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/tags?post=38153"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/pcbcool.com\/fr\/wp-json\/wp\/v2\/post_folder?post=38153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}