TJA1121, MACsec Enabled ASIL B Compliant Automotive Ethernet 1000BASE-T1 PHY Transceiver

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Block Diagram


TJA1121 Block Diagram



  • IEEE802.1AE-2018 MACsec (1 Gbps line rate)


  • IEEE802.3bp compliant 1000BASE-T1 PHY
  • AEC-Q100 Grade 1
  • HVQFN 36-pin package (6 × 6 mm)
  • RGMII (TJA1121A) or SGMII (TJA1121B)
  • OPEN Alliance TC-10

Optimized for Automotive Use Cases

  • Functional Safety - ISO 26262, ASIL B
  • IEEE1588v2 and 802.1AS-rev 2-step timestamping support
  • Support for shielded and unshielded twisted-pair cable
  • Enhanced integrated pulse shaping for low RF emissions


  • Open Alliance TC-12 Advanced PHY Features
  • Built-in self-test (BIST)
  • Real-time monitoring of link stability and data quality


Quick reference to our documentation types.

2 documents


Quick reference to our software types.

2 software files

  • BSPs and Device Drivers

    TJA11xx Linux driver for IEEE 802.3 Clause 45 managed PHYs

  • BSPs and Device Drivers

    XJA11XX Ethernet Phy Real Time Drivers AUTOSAR 4.4 (ISO26262) License

Note: For better experience, software downloads are recommended on desktop.


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