10/100/1000 Base-T Ethernet LAN Switch

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The MAX4890/MAX4891/MAX4892 high-speed analog switches meet the needs of 10/100/1000 Base-T applications. These devices switch the signals from two interface transformers and connect the signals to a single 10/100/1000 Base-T Ethernet PHY, simplifying docking station design and reducing manufacturing costs. The MAX4890/MAX4891/MAX4892 can also route signals from a common interface transformer to two different boards in board-redundancy applications.

The MAX4890/MAX4891/MAX4892 switches provide an extremely low capacitance and on-resistance to meet Ethernet insertion and return-loss specifications. The MAX4891/MAX4892 feature one and three built-in LED switches, respectively.

The MAX4890/MAX4891/MAX4892 are available in space-saving 32- and 36-lead TQFN packages, significantly reducing the required PC board area. These devices operate over the -40°C to +85°C temperature range.
MAX4890, MAX4891, MAX4892: Typical Operating Circuit MAX4890, MAX4891, MAX4892: Typical Operating Circuit Enlarge+

Key Features

  • Single +3.0V to +3.6V Power-Supply Voltage
  • Low On-Resistance (RON): 4Ω (typ), 6.5Ω (max)
  • Ultra-Low On-Capacitance (CON): 6.5pF (typ)
  • Low < 200ps Bit-to-Bit Skew
  • -3dB Bandwidth: 1GHz
  • Optimized Pin-Out for Easy Transformer and PHY Interface
  • Built-In LED Switches for Switching Indicators to Docking Station
  • Low 450µA (max) Quiescent Current
  • Bidirectional 8 to 16 Multiplexer/Demultiplexer
  • Space-Saving Packages
    • 32-Pin, 5mm x 5mm, TQFN Package
    • 36-Pin, 6mm x 6mm, TQFN Package


  • Board-Level Redundancy Protection
  • Notebooks and Docking Stations
  • Servers and Routers with Ethernet Interfaces
  • SONET/SDH Signal Routing
  • T3/E3 Redundancy Protection
  • Video Routing and Switching Systems
Part NumberProtocolFunctionsConfig.ChannelsNormal PositionVSUPPLY (Single)
VSUPPLY (Single)
minmaxmaxmaxmaxmaxSee Notes
MAX4890 LANMux/DeMux1-to-24Open33.66.51000150406.53.5
$2.56 @1k
MAX4891 5
$2.69 @1k
MAX4892 7
$3.14 @1k
See All Switches and Multiplexers (Mid and High Voltage) (299)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 4653 FAQs about Analog Switches

Quality and Environmental Data

Product Reliability Reports: MAX4890.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
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

Type ID PDF Title
App Note 4653 FAQs about Analog Switches