78Q2133/F

Overview

The Analog Devices Inc./Maxim Integrated 78Q2133/F is a MicroPHY Fast Ethernet transceiver designed for 10BASE-T and 100BASE-TX applications. It integrates MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and auto-negotiation functions within a compact 32-QFN package measuring 5x5 mm. The device operates from a single 3.3V ± 0.3V supply with typical power consumption of approximately 290mW. It supports full-duplex operation, automatic MDI/MDI-X crossover correction, and programmable LED indicators. Rated for an industrial temperature range of -40°C to +85°C, it interfaces directly to Cat-5 UTP cabling via dual 1:1 isolation transformers.

Feature Summary

• Integrated Media Independent Interface (MII) and full-featured auto-negotiation compliant with IEEE-802.3 standards
• On-chip pulse-shaper and low-power line driver eliminating the need for external filters
• Adaptive equalizer and baseline restoration circuitry for accurate clock and data recovery
• Automatic polarity correction during auto-negotiation and 10BASE-T signal reception

Applications

• Game consoles
• Broadband modems
• Printers
• Set top boxes
• Audio/video equipment

Procurement Notes

Verify the specific suffix '/F' against official documentation to confirm packaging or material specifications. Confirm that the industrial temperature rating (-40°C to +85°C) aligns with your system requirements. Ensure compatibility with the required 3.3V supply voltage and check for any lead-free or RoHS compliance certifications if mandated by your region.

Selection Notes

Select this component when a compact footprint is critical for embedded Ethernet designs. The integrated nature of the PHY reduces external component count compared to discrete solutions. Consider the 78Q2123 variant if commercial temperature range (0°C to 70°C) suffices for your application environment. Verify MAC interface timing requirements against the MII specifications provided in the datasheet.

Part Context

The 78Q2133 belongs to the MicroPHY family of Fast Ethernet transceivers, which are marketed as among the smallest 10/100 PHY devices available. This series includes the 78Q2123, which shares identical electrical and functional characteristics but is rated for the commercial temperature range. Both parts target space-constrained embedded networking applications requiring low power consumption.

Replacement Considerations

The 78Q2123 is a direct functional substitute with an extended temperature range difference. Verify pinout compatibility and register settings when swapping between these variants.