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Low voltage 0.5 ohm max dual single-pole double-throw analog switch with break-before-make
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The AS21P2TLR is a high-speed CMOS single-pole double-throw (SPDT) analog switch or dual 2:1 multiplexer/demultiplexer bus switch fabricated using silicon gate C²MOS technology. Designed to operate from 1.65 to 4.3 V, this device is ideal for portable applications.

It offers very low ON resistance (RON< 0.5 Ω) at VCC= 3.6 V. The nIN inputs are provided to control the independent channel switches nS1 and nS2. The switches nS1 are ON (connected to common ports Dn) when the nIN input is held high and OFF (state of high impedance exists between the two ports) when nIN is held low. The switches nS2 are ON (connected to common ports Dn) when the nIN input is held low and OFF (state of high impedance exists between the two ports) when IN is held high. 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 and excess transient voltage immunity.

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Key Features

  • Ultra low power dissipation: ICC= 0.2 μA (max.) at TA= 85 °C
  • Low ON resistance VIN= 0 V:
  • RON= 0.50 Ω (max. TA= 25 °C) at VCC= 4.3 V
  • RON= 0.50 Ω (max. TA= 25 °C) at VCC= 3.6 V
  • Wide operating voltage range: VCC(OPR) = 1.65 to 4.3 V single supply
  • 4.3 V tolerant and 1.8 V compatible threshold on digital control input at VCC= 2.3 to 4.3 V
  • Latch-up performance exceeds 300 mA (JESD 17)
  • ESD performance: HMB > 2 kV (MIL STD 883 method 3015)

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS10225: Low voltage 0.5 Ω max dual single-pole double-throw analog switch
1.0 431 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**
AS21P2TLRQActiveVFQFPN 10 1.8x1.4x0.5Tape And Reel-4085_Free Samples.31Distributor reported inventory date: 2015-12-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30006000
Farnell Element14Order NowEUROPE791

(*) 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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