{"id":4527,"date":"2025-11-03T11:12:00","date_gmt":"2025-11-03T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/knowledge-center\/rj45-connectors-with-ethernet-transformers-advantages\/"},"modified":"2026-06-22T05:39:38","modified_gmt":"2026-06-22T05:39:38","slug":"rj45-connectors-with-ethernet-transformers-advantages","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/rj45-connectors-with-ethernet-transformers-advantages","title":{"rendered":"Connecteurs RJ45 avec transformateurs int\u00e9gr\u00e9s : des r\u00e9seaux plus compacts, plus rapides et plus fiables"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f.webp\" alt=\"RJ45 Connectors with Magnetics\" class=\"wp-image-4524\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/c0e57b81d0b543cfaf53a4694cd1062f-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">As modern networks evolve toward higher performance, compact form factors, and power-over-Ethernet (PoE) applications, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm\"><strong>RJ45 connectors with integrated Ethernet transformers<\/strong><\/a> (also called <strong>Magnetic RJ45<\/strong> or <strong>MagJack<\/strong>) have become the preferred choice for engineers and device manufacturers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">These components combine <strong>the mechanical RJ45 interface with built-in magnetic circuitry<\/strong>, giving networking equipment higher reliability, improved EMI performance, and simplified PCB design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this article, we explain the key advantages of Magnetic RJ45 connectors and why they are widely used in <strong>industrial automation, smart buildings, PoE devices, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/what-is-a-router-key-functions-types\/\"><strong>routeurs<\/strong><\/a><strong>, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ip-internet-protocol-cameras-overview\/\"><strong>cam\u00e9ras IP<\/strong><\/a><strong>, IoT gateways, and network switches<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50What Is an Integrated RJ45 Connector?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm\">Connecteurs RJ45 avec magn\u00e9tiques int\u00e9gr\u00e9s<\/a> combine:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>RJ45 Ethernet port<\/p><\/li>\n\n\n\n<li><p>Transformateur d\u2019isolation<\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/ethernet-common-mode-choke-cmc-guide\/\" target=\"_blank\" rel=\"\">Common-mode choke<\/a><\/p><\/li>\n\n\n\n<li><p>EMI filter network (depending on model)<\/p><\/li>\n\n\n\n<li><p>PoE magnetics (optional)<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This design simplifies hardware architecture by removing the need for external magnetic modules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Common names:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 306px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"306\"><p>Industry Term<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Signification<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"306\"><p>Magnetic RJ45<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RJ45 with built-in magnetics<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"306\"><p>MagJack<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Magnetics-integrated RJ45<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"306\"><p>Integrated Ethernet connector<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>RJ45 + transformer in one housing<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 Key Advantages of Magnetic RJ45 Connectors<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Space-Saving &amp; High-Density Design<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-17548-lan-transformer.htm\">integrated transformers<\/a>, designers can free PCB space and support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Multi-port Ethernet switches<\/p><\/li>\n\n\n\n<li><p>Compact IoT devices<\/p><\/li>\n\n\n\n<li><p>Industrial controllers and HMI systems<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is especially valuable in <strong>layer-2\/3 switches, embedded boards, network appliances, and edge devices<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. Simplified PCB Layout &amp; Faster Development<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352-1024x608.webp\" alt=\"LPJG0926HENL Gigabit Magjack\" class=\"wp-image-4525\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352-18x12.webp 18w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/bdb30e0e76b3426e98c204f8e671e352.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Traditional Ethernet designs require external magnetics and precise signal routing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/439792.htm\">Magnetic RJ45 modules<\/a> eliminate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Extra transformer components<\/p><\/li>\n\n\n\n<li><p>Matching and EMI tuning challenges<\/p><\/li>\n\n\n\n<li><p>Complex layout constraints<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Engineers benefit from <strong>faster design cycles and fewer signal-integrity issues<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. Superior EMC\/EMI Performance<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Since the isolation and filtering circuit is factory-tuned, magnetic RJ45 modules offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Strong common-mode noise suppression<\/p><\/li>\n\n\n\n<li><p>Consistent impedance control<\/p><\/li>\n\n\n\n<li><p>Improved EMC test pass rates<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This contributes to stable, low-noise communication in harsh environments.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. Higher Reliability &amp; Manufacturing Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">With fewer external components, manufacturers gain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Reduced soldering and assembly steps<\/p><\/li>\n\n\n\n<li><p>Lower failure rate<\/p><\/li>\n\n\n\n<li><p>Improved quality consistency<\/p><\/li>\n\n\n\n<li><p>Easier supply-chain management<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This is especially important for <strong>high-volume OEM production<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. Built-In PoE Support<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Many models support <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/ieee-802-3af-vs-ieee-802-3at-vs-ieee-802-3bt\/\"><strong>les normes PoE IEEE 802.3af\/at\/bt<\/strong><\/a>, permettant :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Power + data over the same cable<\/p><\/li>\n\n\n\n<li><p>Stable power delivery for <a href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/poe-pd-powered-device-guide\/\" target=\"_blank\" rel=\"\">powered devices (PD)<\/a><\/p><\/li>\n\n\n\n<li><p>Optimized thermal and insertion-loss performance<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Popular applications include PoE:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>cam\u00e9ras IP<\/p><\/li>\n\n\n\n<li><p>Wireless APs<\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/rj45-magnetic-jacks-in-voip-phones\/\" target=\"_blank\" rel=\"\">t\u00e9l\u00e9phones VoIP<\/a><\/p><\/li>\n\n\n\n<li><p>Industrial sensors and controllers<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 Applications of RJ45 Magnetics<\/h2>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 254px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>Market<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Application Examples<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>Automatisation industrielle<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/plc-programmable-logic-controller-for-industrial-automation-guide\/\">PLCs<\/a>, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/glossary\/what-is-scada-systems\/\">serveurs SCADA<\/a>, gateways, HMIs<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>Smart Buildings<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>PoE lighting, access control, IP intercoms<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>Telecom &amp; Networking<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Switches, <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/fr\/knowledge-center\/onu-vs-ont-understanding-the-main-distinctions-guide\/\">ONU\/ONT<\/a>, routers, CPE<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>IoT &amp; Edge Devices<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Smart gateways, Linux SBCs, embedded PCs<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"254\"><p>Security &amp; Surveillance<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>NVRs, IP cameras, AI video analytics systems<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 Why Engineers Prefer Integrated RJ45 Magnetics<\/h2>\n\n\n\n<figure class=\"wp-block-table\">\n<table class=\"has-fixed-layout\">\n<colgroup><col style=\"width: 239px;\"\/><col style=\"min-width: 25px;\"\/><\/colgroup><tbody><tr><th colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Fonctionnalit\u00e9<\/p><\/th><th colspan=\"1\" rowspan=\"1\"><p>Avantage<\/p><\/th><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Isolation &amp; EMC<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Improved signal reliability<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Component Reduction<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Lower BOM and cost<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Efficacit\u00e9 spatiale<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Compact, high-density design<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Prise en charge PoE<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Built-in PoE transformer for PD\/PSE<\/p><\/td><\/tr><tr><td colspan=\"1\" rowspan=\"1\" colwidth=\"239\"><p>Faster Time-to-Market<\/p><\/td><td colspan=\"1\" rowspan=\"1\"><p>Plug-and-play magnetics tuned by manufacturer<\/p><\/td><\/tr><\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 Expert Tip<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For industrial, telecom, and PoE designs, select magnetics that offer:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>1500Vrms isolation or higher<\/p><\/li>\n\n\n\n<li><p><a href=\"https:\/\/www.l-p.com\/store-17492-integrated-rj45-connector.htm?ca=200&amp;cv=1260\" target=\"_blank\" rel=\"\">Industrial temperature range<\/a> (-40\u00b0C to +85\u00b0C)<\/p><\/li>\n\n\n\n<li><p>IEEE 802.3 compliance (10\/100\/1000M\/2.5G\/10G)<\/p><\/li>\n\n\n\n<li><p>Integrated EMI shielding<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This ensures high reliability and certification success (<strong>CE\/FCC\/UL\/RoHS\/REACH<\/strong>).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">RJ45 connectors with built-in Ethernet transformers deliver:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2705 Smaller footprint<br>\u2705 Better EMC and signal integrity<br>\u2705 Reduced BOM and assembly cost<br>\u2705 Faster development cycles<br>\u2705 Higher reliability<br>\u2705 Strong PoE capability<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For compact, high-performance, and industrial Ethernet products, <strong>magnetic RJ45 solutions are the smarter and more future-proof design choice<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 FAQ<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q1: Are integrated RJ45 magnetics suitable for PoE?<\/strong><br>Yes \u2014 many models support IEEE PoE standards up to 802.3bt (90W).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q2: Do they improve EMC performance?<\/strong><br>Yes \u2014 factory-matched magnetics and shielding provide better EMI suppression than discrete circuits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q3: What speeds are supported?<\/strong><br>Options available for <strong>10\/100M, 1G, 2.5G, 5G, and 10G Ethernet<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q4: Which industries use magnetic RJ45s?<\/strong><br>Industrial automation, telecom, smart buildings, security, and IoT devices.<\/p>","protected":false},"excerpt":{"rendered":"<p>Les connecteurs RJ45 dot\u00e9s de transformateurs Ethernet int\u00e9gr\u00e9s am\u00e9liorent la suppression des interf\u00e9rences \u00e9lectromagn\u00e9tiques (EMI), la distribution de puissance PoE et \u00e9conomisent de l\u2019espace sur les cartes de circuits imprim\u00e9s (PCB). D\u00e9couvrez pourquoi les connecteurs RJ45 magn\u00e9tiques sont id\u00e9aux pour les dispositifs industriels et les \u00e9quipements de r\u00e9seautage intelligent.<\/p>","protected":false},"author":1,"featured_media":4526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[22,24],"class_list":["post-4527","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge-center","tag-integrated-rj45-connectors","tag-link-pp"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/comments?post=4527"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4527\/revisions"}],"predecessor-version":[{"id":10944,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/posts\/4527\/revisions\/10944"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media\/4526"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/media?parent=4527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/categories?post=4527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/fr\/wp-json\/wp\/v2\/tags?post=4527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}