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MAX4936, MAX4937, MAX4938, MAX4939

Octal High-Voltage Transmit/Receive Switches

Integrated T/R Switches Significantly Reduce Component Count While Reducing Power
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Active: In Production.


The MAX4936–MAX4939 are octal, high-voltage, transmit/receive (T/R) switches. The T/R switches are based on a diode bridge topology, and the amount of current in the diode bridges can be programmed through an SPI™ interface. All devices feature a latch-clear input to asynchronously turn off all T/R switches and put the device into a low-power shutdown mode. The MAX4936/MAX4938 include the T/R switch and grass-clipping diodes, performing both transmit and receive operations. The MAX4937/MAX4939 include just the T/R switch and perform the receive operation only.

The MAX4936/MAX4938 transmit path is low impedance during high-voltage transmit and high impedance during low-voltage receive, providing isolation between the transmit and receive circuitry. The high-voltage transmit path is high bandwidth, low distortion, and low jitter.

The receive path for all devices is low impedance during low-voltage receive and high impedance during high-voltage transmit, providing protection to the receive circuitry. The low-voltage receive path is high bandwidth, low noise, low distortion, and low jitter. Each T/R switch can be individually programmed on or off, allowing these devices to be used as receive path multiplexers also.

The MAX4936/MAX4937 feature clamping diodes to protect the receiver input from voltage spikes due to leakage currents flowing through the T/R switches during transmission. The MAX4938/MAX4939 do not have clamping diodes and rely on clamping diodes integrated in the receiver front end.

All the devices are available in a small, 56-pin, 5mm x 11mm TQFN package, and are specified over the commercial 0°C to +70°C temperature range.

Data Sheet

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Key Features

  • Low Power: Low Impedance (5Ω) with 1.5mA Bias Current Only
  • Low Noise < 0.5nV/√Hz (typ) with 1.5mA Bias Current Only
  • Wide -3dB Bandwidth 65MHz (typ)
  • Easy Programming with SPI Interface
  • High Density (8 Channels per Package)
  • Grass-Clipping Diodes with Low-Voltage Isolation (MAX4936/MAX4938)
  • Output Clamp Diodes for Receiver Protection (MAX4936/MAX4937)
  • Global Shutdown Control (CLR)
  • Each T/R Switch Can Be Individually Programmed On or Off
  • Low-Voltage Receive Path with High-Voltage Protection
  • Space-Saving, 5mm x 11mm, 56-Pin TQFN Package


  • High-Voltage Transmit and Low-Voltage Isolation
  • Medical/Industrial Imaging
  • Ultrasound

Key Specifications:

Switches and Multiplexers (Mid and High Voltage)
Part Number Functions Config. Channels VSUPPLY (Single)
VSUPPLY (Single)
min max max See Notes
MAX4936  Switch Diode bridge 8 -120 120 5 65 $18.51 @1k
See All Switches and Multiplexers (Mid and High Voltage) (312)

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.


MAX4936, MAX4937, MAX4938, MAX4939: Functional Diagram
Functional Diagram

More Information

New Product Press Release   2010-10-13 ]

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Information Index

Document Ref.: 19-5541 Rev 1; 2011-04-11
This page last modified: 2011-04-11