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The Intersil ISL5120, ISL5121, ISL5122, ISL5123 devices are precision, bidirectional, dual analog switches designed to operate from a single +2. 7V to +12V supply. Targeted applications include battery powered equipment that benefit from the devices’ low power consumption (5μW), low leakage currents (100pA max), and fast switching speeds (tON = 28ns, tOFF = 20ns). Cell phones, for example, often face ASIC functionality limitations. The number of analog input or GPIO pins may be limited and digital geometries are not well suited to analog switch performance. This family of parts may be used to “mux-in” additional functionality while reducing ASIC design risk. Some of the smallest packages are available, alleviating board space limitations and making Intersil’s newest line of low-voltage switches an ideal solution. The ISL5120, ISL5121, ISL5122 are dual single-pole/single-throw (SPST) devices. The ISL5120 has two normally open (NO) switches; the ISL5121 has two normally closed (NC) switches; the ISL5122 has one NO and one NC switch and can be used as an SPDT. The ISL5123 is a committed SPDT, which is perfect for use in 2-to-1 multiplexer applications.


  • Improved (lower rON, faster switching), pin compatible replacements for ISL84541, ISL84542, ISL84543, ISL84544
  • Fully specified at 3.3V, 5V, and 12V supplies
  • ON resistance (rON): 19Ω
  • rON matching between channels: ≤1Ω
  • Low charge injection: 5pC (Max)
  • Single supply operation: +2.7V to +12V
  • Low power consumption (PD): <5μW
  • Low leakage current: 10nA
  • Fast switching action
  • tON: 28ns
  • tOFF: 20ns
  • Guaranteed break-before-make (ISL5122/ISL5123 only)
  • Minimum 2000V ESD protection per method 3015.7
  • TTL, CMOS compatible
  • Available in SOT-23 packaging
  • Pb-free (RoHS compliant)


  • Battery powered, handheld, and portable equipment Cellular/mobile phones Pagers Laptops, notebooks, palmtops
  • Communications systems Military radios PBX, PABX
  • Test equipment Ultrasound Electrocardiograph
  • Heads-up displays
  • Audio and video switching
  • Various circuits +3V/+5V DACs and ADCs Sample and hold circuits Digital filters Operational amplifier gain switching networks High frequency analog switching High speed multiplexing Integrator reset circuits

Product Options

Orderable Part ID Part Status Pkg. Type Carrier Type MOQ Buy Sample
Obsolete SOT23 Reel 3000

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL5120, ISL5121, ISL5122, ISL5123 Datasheet Datasheet PDF 956 KB
Application Notes & White Papers
AN535: Design Considerations for a Data Acquisition System (DAS) Application Note PDF 843 KB
AN557: Recommended Test Procedures for Analog Switches Application Note PDF 468 KB
TB363: Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Other PDF 293 KB