10/100 Fast Ethernet MicroPHY

MicroPHY is the Smallest Ethernet PHY in the Industry

Please check latest availability status for a specific part variant.


Housed in a 32-pin, 5mm x 5mm QFN package, the MicroPHY® is the smallest Fast Ethernet PHY available that provides a full 802.3 media independent interface (MII) to the system media controller.

The 78Q2123/2133 MicroPHYs are designed to meet the growing demands of nontraditional networked applications such as game consoles, set-top boxes, and digital TVs. The tiny size gives designers an edge when board space is at a premium, and its single 3.3V supply requirements eliminate the need for 1.8V regulators or additional voltage conversion capacitors.

The integrated HP Auto MDI/MDI-X function, a must for consumer electronic applications, automatically compensates for crossover cable problems eliminating one of the most common items for consumer help lines.

The MicroPHY’s full MII allows the device to easily interface to any 802.3-compliant MAC. The MicroPHY offers all the essential pins for embedded applications including reset pin, power-down pin, programmable LEDs and more. On-chip regulators masterfully achieve supply-noise isolation among the various blocks while reducing the number of off-chip supply filtering components. A semidigital architecture and digital clock recovery unit are used in the receiver to maximize circuit noise immunity.

The MicroPHY includes integrated ENDECs, scrambler/descrambler, dual-speed clock recovery, and full-featured autonegotiation functions. The transmitter includes an on-chip pulse-shaper and a low-power line driver. The receiver has an adaptive equalizer and a baseline restoration circuit required for accurate clock and data recovery. The transceiver interfaces to Category-5 unshielded twisted pair (Cat-5 UTP) cabling through 1:1 isolation transformers without the need for external filtering.

Key Features

  • Low Power and Flexible Power-Supply Management
    • Power-Down/Save and Transmitter Disable
    • Power-Off State Dissipation < 20mW
  • Single 3.3V Supply Operation with Low Power Dissipation
    • Optimized Low Power Design
  • HP Auto-MDI/MDI-X Automatic Cable Crossover Correction
  • Fully Integrated 802.3u Fast Ethernet Transceiver
  • Commercial and Industrial Temperature Ranges


  • Digital Video Recorders/Players
  • High Definition 1080P/1080i DTVs
  • High-Performance Satellite, Cable, and IPTV Set-Top Boxes
  • IP-PVR and Video Distribution Systems
  • Multimedia Residential Gateways

Quality and Environmental Data

Request Reliability Report for: 78Q2133 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • 78Q2133/F
  • 78Q2133R/F
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources

    IO-Link Transceiver with Integrated Protection

    • High Configurability and Integration Reduces SKU
    • Integrated Protection Enables Robust Systems
    • Optimized for Small Designs

    100Mbps Full-Duplex 3V/5V RS-485/RS-422 Transceiver with High EFT Immunity

    • High-Speed Operation
    • Integrated Protection Increases Robustness
    • Flexibility for Many Different Applications

    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.