50 Ohm, Dual SPST Analog Switches in UCSP

Please check latest availability status for a specific part variant.


The MAX4731/MAX4732/MAX4733 low-voltage, dual, single-pole/single-throw (SPST) analog switches operate from a single +2V to +11V supply and handle rail-to- rail analog signals. These switches exhibit low leakage current (0.1nA) and consume less than 0.5nW (typ) of quiescent power, making them ideal for battery-powered applications.

When powered from a +3V supply, these switches feature 50Ω (max) on-resistance (RON) with 3.5Ω (max) matching between channels, and 9Ω (max) flatness over the specified signal range.

The MAX4731 has two normally open (NO) switches, the MAX4732 has two normally closed (NC) switches, and the MAX4733 has one NO and one NC switch. The MAX4731/MAX4732/MAX4733 are available in 9-bump chip-scale packages (UCSP™), along with 8-pin TDFN and 8-pin µMAX® packages. The tiny UCSP occupies a 1.52mm x 1.52mm area and significantly reduces the required PC board area.
MAX4731, MAX4732: Pin Configuration MAX4731, MAX4732: Pin Configuration Enlarge+

Key Features

  • 1.52mm x 1.52mm UCSP Package
  • Guaranteed On-Resistance (RON)
    • 25Ω (max) at +5V
    • 50Ω (max) at +3V
  • On-Resistance Matching
    • 3Ω (max) at +5V
    • 3.5Ω (max) at +3V
  • Guaranteed < 0.1nA Leakage Current at TA = +25°C
  • Single-Supply Operation from +2.0V to +11V
  • TTL/CMOS-Logic Compatible
  • -108dB Crosstalk (1MHz)
  • -72dB Off-Isolation (1MHz)
  • Low Power Consumption: 0.5nW (typ)
  • Rail-to-Rail Signal Handling


  • Audio/Video Signal Routing
  • Battery-Powered Systems
  • Cell Phones
  • Communications Circuits
  • Low-Voltage Data-Acquisition Systems
  • PDAs
Part NumberFunctionsConfig.ChannelsNormal PositionVSUPPLY (Single)
VSUPPLY (Single)
minmaxmaxmaxmaxmaxSee Notes
MAX4731 SwitchSPST2Open211503000.1150607.54020
UCSP (B)/9
$0.79 @1k
MAX4732 Closed7.5
UCSP (B)/9
$0.82 @1k
MAX4733 Open/Closed-
UCSP (B)/9
$0.79 @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 1073 Tiny Analog Switch Alleviates I²C Address Conflicts

Quality and Environmental Data

Request Reliability Report for: MAX4733 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX4733

CAD Symbols and Footprints

  • MAX4733ETA+T
  • MAX4733EUA
  • MAX4733EUA+
  • MAX4733EUA+T
  • MAX4733EUA-T
  • 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.

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    Related Resources

    Ultra-Small, Low-RON, Beyond-the-Rails DPST Analog Switches

    • Distortion-Free Beyond-the-Rails Signaling
    • Low Supply Current 65µA (typ) at 1.6V
    • ESD Protection on COM_,NO_