1000 Base-T, ±15kV ESD Protection LAN Switch

High-Speed Analog Switch for Gigabit Ethernet Applications that Switch the Signals from Two Interface Transformers and Connect Them to a Single Ethernet Controller


The MAX4927 meets the needs of high-speed differential switching, including that of Gigabit Ethernet (10/100/1000) Base-T switching as well as LVDS and LVPECL switching. The MAX4927 provides enhanced ESD protection up to ±15kV and excellent high-frequency response, making the device especially useful for interfaces that must go to an outside connection.

The MAX4927 offers extremely low capacitance (CON), as well as low on-resistance (RON), for low-insertion loss and very wide bandwidth. In addition to the four pairs of DPDT switches, the MAX4927 provides LED switching for laptop computer/docking station use.

The MAX4927 is pin-to-pin equivalent to the PI3L500-A and STMUX1000L. The MAX4927 can replace either device in those applications, improving ESD protection and eliminating external ESD components. The MAX4927 is available in a space-saving 56-pin TQFN package and operates over the extended -40°C to +85°C temperature range.
MAX4927: Functional Diagram MAX4927: Functional Diagram Enlarge+

Key Features

  • ESD Protection
    • ±15kV–IEC 61000-4-2 Air-Gap Discharge
    • ±8kV–IEC 61000-4-2 Contact Discharge
    • ±15kV–Human Body Model
  • Single +3.0V to +3.6V Power-Supply Voltage
  • Low 4Ω (typ), 6.5Ω (max) On-Resistance (RON)
  • Ultra-Low 8pF (typ) On-Capacitance (CON)
  • -23dB Return Loss (100MHz)
  • -3dB Bandwidth: 650MHz
  • 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
  • Standard Pin Out, Matching the PI3L500-A and STMUX1000L
  • Space-Saving Lead-Free Package
    • 56-Pin, 5mm x 11mm, TQFN Package


  • Board-Level Redundancy Protection
  • LVDS and LVPECL Switching
  • Notebooks and Docking Stations
  • Servers and Routers with Ethernet Interfaces
  • SONET/SDH Signal Routing
  • T3/E3 Redundancy Protection
Part Number Protocol Config. Channels VSUPPLY (Single)
VSUPPLY (Single)
Dynamic Range (max)
min max min max max max typ max min max See Notes
MAX4927  LAN 2-to-1 11 3 3.6 0 3.6 3.6 5.5 0.01 650 1000 50 50 6.5 $3.45 @1k
See All Switches and Multiplexers (Low Voltage) (172)
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.

Quality and Environmental Data

Request Reliability Report for: MAX4927 
Lead-Free Package Tin (Sn) Whisker Reports

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