{"id":3754,"date":"2025-08-03T08:54:00","date_gmt":"2025-08-03T00:54:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3754"},"modified":"2025-08-02T18:25:55","modified_gmt":"2025-08-02T10:25:55","slug":"key-parameters-of-pcb-circuit-boards","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/","title":{"rendered":"Param\u00e8tres cl\u00e9s des cartes de circuits imprim\u00e9s"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#Detailed_Explanation_of_Key_PCB_Parameters\" >Explication d\u00e9taill\u00e9e des principaux param\u00e8tres de la carte de circuit imprim\u00e9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#1_Electrical_Performance_Parameters\" >1. Param\u00e8tres de performance \u00e9lectrique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#2_Thermal_Performance_Parameters\" >2. Param\u00e8tres de performance thermique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#3_Mechanical_Performance_Parameters\" >3. Param\u00e8tres de performance m\u00e9canique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#4_Structural_Characteristics\" >4. Caract\u00e9ristiques structurelles<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#5_Reliability_Testing_Metrics\" >5. Mesures des tests de fiabilit\u00e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#6_Environmental_Process_Compliance\" >6. Respect de l'environnement et des processus<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#PCB_Board_Classification_and_Selection\" >Classification et s\u00e9lection des cartes de circuits imprim\u00e9s<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#1_Common_PCB_Materials\" >1. Mat\u00e9riaux courants des circuits imprim\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#2_PCB_Material_Grades_Comparison\" >2. Comparaison des qualit\u00e9s de mat\u00e9riaux des circuits imprim\u00e9s<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/#3_How_to_Choose_the_Right_PCB_Material\" >3. Comment choisir le bon mat\u00e9riau pour les circuits imprim\u00e9s ?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Detailed_Explanation_of_Key_PCB_Parameters\"><\/span><strong>Explication d\u00e9taill\u00e9e des principaux param\u00e8tres de la carte de circuit imprim\u00e9<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Electrical_Performance_Parameters\"><\/span><strong>1. Param\u00e8tres de performance \u00e9lectrique<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Les propri\u00e9t\u00e9s \u00e9lectriques d'une carte de circuit imprim\u00e9 ont une incidence directe sur l'int\u00e9grit\u00e9 des signaux, en particulier dans les circuits \u00e0 haute fr\u00e9quence et \u00e0 grande vitesse.<\/p><ul class=\"wp-block-list\"><li><strong>Constante di\u00e9lectrique (Dk)<\/strong> - Mesure la capacit\u00e9 d'un mat\u00e9riau \u00e0 stocker l'\u00e9nergie \u00e9lectrique. Les valeurs de Dk inf\u00e9rieures (par exemple, le PTFE avec Dk\u22482,2) permettent une transmission plus rapide des signaux, ce qui les rend id\u00e9ales pour les applications de la 5G et des ondes millim\u00e9triques.<\/li>\n\n<li><strong>Facteur de dissipation (Df\/Tangente de perte)<\/strong> - Indique une perte d'\u00e9nergie du signal. Les applications \u00e0 haute fr\u00e9quence (par exemple, radar, communication par satellite) requi\u00e8rent un Df &lt; 0,005.<\/li>\n\n<li><strong>R\u00e9sistivit\u00e9 surface\/volume<\/strong> - La r\u00e9sistance d'isolation \u00e9lev\u00e9e (&gt;10\u00b9\u00b2 \u03a9-cm) emp\u00eache les courants de fuite, ce qui est crucial pour les circuits imprim\u00e9s \u00e0 haute tension (par exemple, les modules de puissance).<\/li>\n\n<li><strong>Tension de rupture<\/strong> - Le FR4 standard supporte \u226520 kV\/mm, tandis que les substrats c\u00e9ramiques peuvent supporter jusqu'\u00e0 50 kV\/mm.<\/li>\n\n<li><strong>Contr\u00f4le de l'imp\u00e9dance<\/strong> - Les circuits imprim\u00e9s \u00e0 grande vitesse (par exemple, DDR5, PCIe 6.0) exigent une tol\u00e9rance d'imp\u00e9dance \u00e9troite (\u00b15%) pour minimiser les r\u00e9flexions de signaux.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters.jpg\" alt=\"Param\u00e8tres du PCB\" class=\"wp-image-3756\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Thermal_Performance_Parameters\"><\/span><strong>2. Param\u00e8tres de performance thermique<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>La r\u00e9sistance \u00e0 la chaleur d'un circuit imprim\u00e9 d\u00e9termine sa fiabilit\u00e9 dans les environnements \u00e0 haute temp\u00e9rature, en particulier pour la soudure sans plomb et la stabilit\u00e9 \u00e0 long terme.<\/p><ul class=\"wp-block-list\"><li><strong>Temp\u00e9rature de transition vitreuse (Tg)<\/strong> - Le FR4 standard a une Tg\u2248130\u00b0C, tandis que les circuits imprim\u00e9s \u00e0 haute Tg (Tg\u2265170\u00b0C) sont utilis\u00e9s dans l'\u00e9lectronique automobile et militaire.<\/li>\n\n<li><strong>Temp\u00e9rature de d\u00e9composition thermique (Td)<\/strong> - Les mat\u00e9riaux ayant un Td &gt; 325\u00b0C (par exemple, Isola 370HR) sont pr\u00e9f\u00e9rables pour le brasage sans plomb.<\/li>\n\n<li><strong>Conductivit\u00e9 thermique<\/strong> - Le FR4 a une faible conductivit\u00e9 thermique (~0,3 W\/m-K), alors que les circuits imprim\u00e9s \u00e0 noyau m\u00e9tallique (aluminium, par exemple) peuvent atteindre 10 W\/m-K, ce qui les rend id\u00e9aux pour le refroidissement des LED.<\/li>\n\n<li><strong>Coefficient de dilatation thermique (CTE)<\/strong> - Le CTE de l'axe Z doit \u00eatre &lt;50 ppm\/\u00b0C pour \u00e9viter la d\u00e9lamination dans les PCB multicouches (les substrats IC n\u00e9cessitent un CTE\u22486 ppm\/\u00b0C).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Mechanical_Performance_Parameters\"><\/span><strong>3. Param\u00e8tres de performance m\u00e9canique<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>La r\u00e9sistance m\u00e9canique a une incidence sur les processus d'assemblage et la durabilit\u00e9 \u00e0 long terme.<\/p><ul class=\"wp-block-list\"><li><strong>R\u00e9sistance \u00e0 la flexion<\/strong> - Le FR4 standard se situe entre 400 et 600 MPa, tandis que les PCB flexibles (polyimide) n\u00e9cessitent plus de 200 MPa.<\/li>\n\n<li><strong>Force du peeling<\/strong> - L'adh\u00e9rence du cuivre doit \u00eatre sup\u00e9rieure \u00e0 1,0 N\/mm (norme IPC) pour \u00e9viter le d\u00e9tachement de la feuille pendant la soudure.<\/li>\n\n<li><strong>Absorption de l'eau<\/strong> - La faible absorption d'humidit\u00e9 (&lt;0,2%) emp\u00eache la formation de cloques ; les stratifi\u00e9s haute fr\u00e9quence conservent g\u00e9n\u00e9ralement une temp\u00e9rature inf\u00e9rieure \u00e0 0,1%.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Structural_Characteristics\"><\/span><strong>4. Caract\u00e9ristiques structurelles<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>La pr\u00e9cision de fabrication est essentielle pour <a href=\"https:\/\/www.topfastpcb.com\/fr\/products\/hdi-pcb\/\">interconnexion \u00e0 haute densit\u00e9 (HDI)<\/a> et des conceptions miniaturis\u00e9es.<\/p><ul class=\"wp-block-list\"><li><strong>Tol\u00e9rance sur l'\u00e9paisseur du cuivre<\/strong> - Le cuivre standard de 1 oz a une tol\u00e9rance de \u00b110%, alors que les circuits de pr\u00e9cision requi\u00e8rent \u00b15%.<\/li>\n\n<li><strong>Pr\u00e9cision de l'enregistrement d'une couche \u00e0 l'autre<\/strong> - Les circuits imprim\u00e9s HDI exigent un alignement de &lt;25 \u03bcm, alors que les circuits multicouches standard permettent un alignement de &lt;50 \u03bcm.<\/li>\n\n<li><strong>Trace minimale\/espace (L\/S)<\/strong> - Les circuits imprim\u00e9s standard utilisent 0,1 mm\/0,1 mm, tandis que les substrats IC avanc\u00e9s atteignent 20 \u03bcm\/20 \u03bcm.<\/li><\/ul><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1.jpg\" alt=\"Param\u00e8tres du PCB\" class=\"wp-image-3757\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Reliability_Testing_Metrics\"><\/span><strong>5. Mesures des tests de fiabilit\u00e9<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Les PCB doivent subir des tests rigoureux pour garantir leur stabilit\u00e9 \u00e0 long terme.<\/p><ul class=\"wp-block-list\"><li><strong>R\u00e9sistance du filament anodique conducteur (CAF)<\/strong> - Evalue les risques de court-circuit dans des conditions humides (85\u00b0C\/85% RH pendant 1000 heures).<\/li>\n\n<li><strong>R\u00e9sistance d'isolation de surface (SIR)<\/strong> - Doit d\u00e9passer 10\u2078 \u03a9 (selon les normes JIS).<\/li>\n\n<li><strong>Essai de cyclage thermique<\/strong> - R\u00e9siste \u00e0 100 cycles (-55\u00b0C \u00e0 125\u00b0C) sans se fissurer (les circuits imprim\u00e9s automobiles n\u00e9cessitent des tests plus stricts).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Environmental_Process_Compliance\"><\/span><strong>6. Respect de l'environnement et des processus<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><p>Les r\u00e9glementations environnementales (par exemple, RoHS, REACH) sont \u00e0 l'origine des progr\u00e8s r\u00e9alis\u00e9s dans le domaine des mat\u00e9riaux pour PCB.<\/p><ul class=\"wp-block-list\"><li><strong>Indice de suivi comparatif (CTI)<\/strong> - Les dispositifs m\u00e9dicaux n\u00e9cessitent la classe 3 (400-600 V), tandis que les contr\u00f4les industriels n\u00e9cessitent la classe 2.<\/li>\n\n<li><strong>Sans halog\u00e8ne<\/strong> - La teneur en chlore\/brome doit \u00eatre inf\u00e9rieure \u00e0 900 ppm pour r\u00e9duire les \u00e9missions toxiques.<\/li>\n\n<li><strong>Retardateur de flamme (UL94)<\/strong> - V-0 est l'indice le plus \u00e9lev\u00e9, obligatoire pour les applications a\u00e9rospatiales.<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Board_Classification_and_Selection\"><\/span><strong>Classification et s\u00e9lection des cartes de circuits imprim\u00e9s<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Common_PCB_Materials\"><\/span><strong>1. Mat\u00e9riaux courants des circuits imprim\u00e9s<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>FR4<\/strong> - Stratifi\u00e9 \u00e9poxy standard pour l'\u00e9lectronique grand public.<\/li>\n\n<li><strong>CEM-3<\/strong> - Substrat composite, rentable pour les circuits imprim\u00e9s simples \u00e0 double face.<\/li>\n\n<li><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/products\/high-tg-rigid-pcb\/\">PCB \u00e0 haute teneur en Tg<\/a> (Tg\u2265170\u00b0C)<\/strong> - R\u00e9sistant \u00e0 la chaleur pour les applications automobiles et militaires.<\/li>\n\n<li><strong>Stratifi\u00e9s haute fr\u00e9quence (par exemple, Rogers RO4003C)<\/strong> - Faible Dk\/Df pour les applications 5G\/radar.<\/li>\n\n<li><strong><a href=\"https:\/\/www.topfastpcb.com\/fr\/products\/metal-core-pcb\/\">Circuits imprim\u00e9s \u00e0 \u00e2me m\u00e9tallique<\/a> (aluminium\/cuivre)<\/strong> - Excellente gestion thermique pour les LED et les modules de puissance.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_PCB_Material_Grades_Comparison\"><\/span><strong>2. Comparaison des qualit\u00e9s de mat\u00e9riaux des circuits imprim\u00e9s<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Qualit\u00e9 des mat\u00e9riaux<\/th><th>Caract\u00e9ristiques<\/th><th>Applications typiques<\/th><\/tr><\/thead><tbody><tr><td><strong>94HB<\/strong><\/td><td>A base de papier, non retardateur de flamme<\/td><td>Electronique grand public \u00e0 bas prix<\/td><\/tr><tr><td><strong>94V0<\/strong><\/td><td>Substrat en papier ignifug\u00e9<\/td><td>Tableaux de commande d'appareils m\u00e9nagers<\/td><\/tr><tr><td><strong>CEM-1<\/strong><\/td><td>Fibre de verre simple face<\/td><td>Circuits simples<\/td><\/tr><tr><td><strong>CEM-3<\/strong><\/td><td>Demi-verre double face<\/td><td>Circuits imprim\u00e9s double couche \u00e0 faible co\u00fbt<\/td><\/tr><tr><td><strong>FR4<\/strong><\/td><td>Fibre de verre standard<\/td><td>Electronique grand public, contr\u00f4les industriels<\/td><\/tr><tr><td><strong>FR4 \u00e0 haute teneur en Tg<\/strong><\/td><td>R\u00e9sistant aux hautes temp\u00e9ratures<\/td><td>Automobile, a\u00e9rospatiale<\/td><\/tr><\/tbody><\/table><\/figure><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3.jpg\" alt=\"Param\u00e8tres du PCB\" class=\"wp-image-3758\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/08\/PCB-parameters-3-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_How_to_Choose_the_Right_PCB_Material\"><\/span><strong>3. Comment choisir le bon mat\u00e9riau pour les circuits imprim\u00e9s ?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Applications haute fr\u00e9quence<\/strong> \u2192 Mat\u00e9riaux \u00e0 faible Dk\/Df (Rogers, Taconic).<\/li>\n\n<li><strong>Environnements \u00e0 haute temp\u00e9rature<\/strong> \u2192 Mat\u00e9riaux \u00e0 haute Tg (\u2265170\u00b0C) ou \u00e0 haute Td (&gt;325\u00b0C).<\/li>\n\n<li><strong>Dissipation de la chaleur \u00e0 haute puissance<\/strong> \u2192 Noyau m\u00e9tallique ou FR4 \u00e0 haute conductivit\u00e9 thermique.<\/li>\n\n<li><strong>Exigences \u00e9cologiques<\/strong> \u2192 Mat\u00e9riaux sans halog\u00e8ne, conformes \u00e0 la directive RoHS.<\/li><\/ul><p>La s\u00e9lection des param\u00e8tres des circuits imprim\u00e9s a une incidence directe sur les performances, la fiabilit\u00e9 et le co\u00fbt des produits. Les ing\u00e9nieurs doivent s\u00e9lectionner les mat\u00e9riaux appropri\u00e9s (FR4, CEM-3, PCB \u00e0 Tg \u00e9lev\u00e9, etc.) en fonction du sc\u00e9nario d'application (haute fr\u00e9quence, haute temp\u00e9rature, haute puissance) et optimiser la conception pour am\u00e9liorer l'int\u00e9grit\u00e9 du signal, les capacit\u00e9s de dissipation de la chaleur et la r\u00e9sistance m\u00e9canique.<\/p>","protected":false},"excerpt":{"rendered":"<p>Les performances des circuits imprim\u00e9s d\u00e9pendent de plusieurs param\u00e8tres cl\u00e9s, tels que la constante di\u00e9lectrique (valeur DK), la temp\u00e9rature de transition vitreuse (Tg), la r\u00e9sistance \u00e0 la chaleur (Td), l'indice de fluage (CTI) et le coefficient de dilatation thermique (CTE). Diff\u00e9rents mat\u00e9riaux de cartes (tels que FR4, CEM-3 et PCB \u00e0 haute Tg) conviennent \u00e0 diff\u00e9rentes applications, telles que les communications \u00e0 haute fr\u00e9quence, l'\u00e9lectronique automobile ou les \u00e9quipements \u00e0 haute puissance.<\/p>","protected":false},"author":1,"featured_media":3759,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112],"tags":[336],"class_list":["post-3754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-pcb-parameters"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Key parameters of PCB circuit boards - Topfastpcb<\/title>\n<meta name=\"description\" content=\"Key parameters of PCB circuit boards, including dielectric constant (DK value), glass transition temperature (Tg), heat resistance (Td), CTI, CTE, etc. Understand the characteristics and application scenarios of different board materials (FR4, CEM-3, high Tg PCB) to optimize PCB design and improve performance and reliability.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.topfastpcb.com\/fr\/blog\/key-parameters-of-pcb-circuit-boards\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Key parameters of PCB circuit boards - 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