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Low voltage high bandwidth dual single-pole double-throw analog switch
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The AS21P2THB is a high-speed CMOS low voltage dual analog SPDT (single pole double throw) switch or 2:1 multiplexer/demultiplexer switch fabricated in silicon gate C²MOS technology. It is designed to operate from 1.65 V to 4.3 V, thus making this device the ideal selection for portable applications.

The SEL input is provided to control the switch. The switch nS1 is ON (connected to common ports Dn) when the SEL input is held high and OFF (high impedance state exists between the two ports) when SEL is held low, the switch nS2 is ON (it is connected to common port Dn) when the SEL input is held low and OFF (high impedance state exists between the two ports) when SEL is held high. AS21P2THB has an integrated fail safe function to withstand over-voltage condition when the device is powered off.

The AS21P2THB also has an interrupt pin which sends a signal to the processor when the device is in dedicated port charging mode. Additional key features are fast switching speed, break-before-make-delay time and ultralow power consumption. All inputs and outputs are equipped with protection circuits against static discharge, giving them ESD immunity and transient excess voltage.

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Key Features

  • Ultra low power dissipation:
  • ICC= 1 μA (max.) at TA= 85 °C
  • Low “ON” resistance:
  • RON= 4.8 Ω (TA = 25 °C) at VCC= 4.3 V
  • RON= 5.9 Ω (TA = 25 °C) at VCC= 3.0 V
  • Wide operating voltage range:
  • VCC (opr.) = 1.65 V to 4.3 V
  • 4.3 V tolerant and 1.8 V compatible threshold on digital control input at VCC= 2.3 V to 3.0 V
  • Typical bandwidth (-3 dB) at 800 MHz on all channels
  • USB (2.0) high speed (480 Mbps) signal switching compliant
  • Integrated fail safe function
  • Interrupt function to indicate to the processor that the device is in dedicated port charging mode
  • Latch-up performance exceeds 500 mA per JESD 78, Class II
  • ESD performance exceeds JESD22:
  • Dn pins: 4000-V human body model (A114-A)
  • All other pins: 2000-V human body model (A114-A)

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS10224: Low voltage high bandwidth dual single-pole double-throw analog switch
1.0 485 KB

Presentations & Training Material


Description Version Size
ST offering in Wearable - Analog and Mixed Signal Portfolio
3.0 1,508 KB

Publications and Collaterals


Description Version Size
Analog ICs for wearable devices
2.0 981 KB
Brochure Wearables
0815 6,572 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Automotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
AS21P2THBQActiveVFQFPN 10 1.8x1.4x0.5Tape And Reel_Free Samples.46Distributor reported inventory date: 2015-12-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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