Bcm89890 May 2026

The BCM89890 Deep Dive: Understanding Broadcom’s Automotive Ethernet Powerhouse

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Unlike traditional Ethernet, 100BASE-T1 does require isolation magnetics in the same way. However, the BCM89890 still requires a Common Mode Choke (CMC) on the MDI (Media Dependent Interface) lines to suppress EMI. Broadcom’s reference designs typically specify a specific CMC part number from TDK or Murata.

  1. A typical automotive wiring harness is the third-heaviest and most expensive component in a vehicle (after the chassis and powertrain). Replacing a standard 100BASE-TX dual-pair cable with the single-pair solution of the BCM89890 can reduce harness weight by up to 30% for infotainment and ADAS networks. bcm89890

    • It sends 100 Mbps of data over a single, unshielded twisted pair of copper wires.
    • It complies with the IEEE 802.3bw standard (BroadR-Reach).
    • It’s designed to survive the brutal environment of a vehicle: extreme temperatures, massive electrical noise from motors, and constant vibration.

    The BCM89890!

    The Future Role

    Power Efficiency:

    Features multiple low-power modes to reduce energy consumption. A typical automotive wiring harness is the third-heaviest

  2. Technical Specifications: