{"id":10378,"date":"2026-07-19T13:07:26","date_gmt":"2026-07-19T13:07:26","guid":{"rendered":"https:\/\/ic-vendor.com\/ksz8081rnbia\/"},"modified":"2026-07-19T13:07:26","modified_gmt":"2026-07-19T13:07:26","slug":"ksz8081rnbia","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/ksz8081rnbia\/","title":{"rendered":"KSZ8081RNBIA"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The KSZ8081RNBIA is a single-port 10\/100 Ethernet PHY transceiver from Microchip with RMII v1.2 MAC interface. It integrates on-chip termination resistors, a 1.2V core regulator, and HP Auto-MDIX for automatic crossover cable detection. The industrial-grade (-40 to +85C) variant is in a 32-pin QFN (5x5mm) package with EtherCAT support.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Device Type<\/td>\n10\/100 Ethernet PHY Transceiver<\/td>\n<\/tr>\n
Line Speed<\/td>\n10\/100Mbps (10BASE-T, 100BASE-TX)<\/td>\n<\/tr>\n
MAC Interface<\/td>\nMII \/ RMII v1.2<\/td>\n<\/tr>\n
Auto-MDIX<\/td>\nHP Auto-MDI\/MDI-X<\/td>\n<\/tr>\n
EtherCAT Support<\/td>\nYes<\/td>\n<\/tr>\n
On-Chip Termination<\/td>\nYes (differential pairs)<\/td>\n<\/tr>\n
Integrated Regulator<\/td>\n1.2V core (single 3.3V supply)<\/td>\n<\/tr>\n
LinkMD Cable Diagnostics<\/td>\nYes (TDR-based)<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n3.3V<\/td>\n<\/tr>\n
Digital I\/O Voltage<\/td>\n1.8V \/ 2.5V \/ 3.3V<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n32-QFN (5x5mm, EP)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40\u00b0C to +85\u00b0C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Single-chip 10BASE-T\/100BASE-TX IEEE 802.3 transceiver<\/li>\n
  • RMII v1.2 with 50MHz reference clock output to MAC<\/li>\n
  • HP Auto-MDI\/MDI-X eliminates crossover cable concerns<\/li>\n
  • On-chip termination resistors reduce BOM cost<\/li>\n
  • LinkMD TDR cable diagnostics<\/li>\n
  • EtherCAT fieldbus support<\/li>\n
  • Baseline wander correction<\/li>\n
  • Programmable interrupt and LED outputs<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Industrial Ethernet and EtherCAT slaves<\/li>\n
    • IP cameras and NVRs<\/li>\n
    • Printers and multifunction peripherals<\/li>\n
    • Game consoles and set-top boxes<\/li>\n
    • Embedded Ethernet for MCU\/SoC<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The KSZ8081RNBIA is a single-port 10\/100 Ethernet PHY transceiver from Microchip with RMII v1.2 MAC interface. It integrates on-chip termination resistors, a 1.2V core regulator, and HP Auto-MDIX for automatic crossover cable detection. The industrial-grade (-40 to +85C) variant is in a 32-pin QFN (5x5mm) package with EtherCAT support. Key Specifications Device Type […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,20],"tags":[1649,1682,1675],"chip_brand":[134],"class_list":["post-10378","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-interface-ics","tag-ethernet-phy","tag-ksz8081rnbia","tag-rmii","chip_brand-microchip"],"acf":{"brief_explanation":"10\/100 Ethernet PHY, RMII\/MII, HP Auto-MDIX, EtherCAT, 32-QFN(5x5), -40~85\u00b0C","date_code":"","package_case":"32-QFN (5x5mm), Exposed Pad","in_stock":9200,"datasheet":"https:\/\/www.microchip.com\/en-us\/product\/KSZ8081","price":"","product_introduction":"The KSZ8081RNBIA is a single-port 10\/100Mbps Ethernet PHY transceiver from Microchip with RMII v1.2 and MII MAC-side interface support. It integrates on-chip termination resistors for the differential pairs and a low-noise 1.2V core regulator, enabling single 3.3V supply operation and reduced BOM cost. HP Auto-MDI\/MDI-X automatically detects and corrects straight-through and crossover cable connections. LinkMD TDR-based cable diagnostics identify faulty copper cabling. The industrial-grade device in 32-pin QFN (5x5mm) supports EtherCAT fieldbus applications.","working_principle":"The KSZ8081 implements 10BASE-T and 100BASE-TX physical layers. For 100BASE-TX, it performs 4B5B encoding\/decoding, MLT-3 signaling, and digital adaptive equalization with echo cancellation. For 10BASE-T, Manchester encoding is used. The RMII interface transfers data to the MAC using 2-bit wide TXD\/RXD buses at 50MHz reference clock. The 25MHz crystal input is multiplied internally to generate the 50MHz RMII clock output. Auto-negotiation determines the best speed and duplex with the link partner. HP Auto-MDIX detects and corrects MDI\/MDI-X polarity, eliminating the need for specific cable types. LinkMD uses TDR to measure distance to cable faults.","pin_description":"
      Interface<\/th>Signals<\/th>Function<\/th><\/tr>
      RMII\/MII<\/td>TXD[3:0], RXD[3:0], TXEN, RXDV, REF_CLK<\/td>MAC data interface<\/td><\/tr>
      MDIO\/MDC<\/td>2 pins<\/td>Management interface<\/td><\/tr>
      Line Side<\/td>TXP\/TXN, RXP\/RXN<\/td>Twisted-pair signals<\/td><\/tr>
      Crystal<\/td>XTAL1\/XTAL2<\/td>25MHz reference<\/td><\/tr><\/table>","application_scenarios":"
      • Industrial EtherCAT slave PHY interface<\/li>
      • IP camera and NVR 10\/100 Ethernet port<\/li>
      • Printer and MFP embedded LAN<\/li>
      • Game console and set-top box Ethernet<\/li>
      • General embedded MCU\/SoC Ethernet PHY<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Speed<\/th>Notes<\/th><\/tr>
        Microchip<\/td>LAN8742A-CZ-TR<\/td>10\/100<\/td>RMII, WoL, 24-QFN<\/td><\/tr>
        Realtek<\/td>RTL8201F-CG<\/td>10\/100<\/td>RMII PHY, lower cost<\/td><\/tr>
        TI<\/td>DP83848CVV<\/td>10\/100<\/td>MII\/RMII, 48-LQFP<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10378"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10378\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10378"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}