The ISL21440 is a micropower, FGA reference, and comparator on a single chip. Drawing less than 6. 5μA supply current across the full operating temperature range, the ISL21440 operates from a single 2V to 11V supply and can also be used with split bipolar supplies. The ISL21440’s on-board reference provides a 1. 182V ±0. 5% output. It features programmable hysteresis and TTL/CMOS compatible outputs that sink and source current. Low bias currents permit high value divider resistors for typical circuit current drains of


  • 6.5μA supply current across the full temperature range
  • Wide supply range: 2V to 11V
  • Precision 1.182V ±0.5% voltage reference
  • Comparator with user programmable hysteresis
  • Temperature range: -40°C to +125°C
  • 8 Ld MSOP and 8 Ld TDFN packages
  • Pin compatible upgrade to MAX921 and LTC1440


  • Low Battery Detector
  • Low Voltage Reset
  • Overvoltage Monitor
  • Window Comparator

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active TDFN Tube 100
Active TDFN Reel 6000
Active MSOP Tube 80
Active MSOP Reel 2500


Title language Type Format File Size Date
Datasheets & Errata
ISL21440 Datasheet Datasheet PDF 1019 KB
Application Notes & White Papers
AN177: Voltage Reference Application and Design Note Application Note PDF 1.39 MB
AN9675: A Tutorial in Coherent and Windowed Sampling with A/D Converters Application Note PDF 503 KB
AN9705: A Theoretical View of Coherent Sampling Application Note PDF 287 KB
PCN17014 - Data Sheet Electrical Specification change for ISL21440* Product Product Change Notice PDF 383 KB
PCN16032 - Wafer Fabrication Site and Datasheet change for Listed Intersil ISL21440* Products Product Change Notice PDF 414 KB
PCN12094 - Alternate Manufacturing Site for Assembly of the Listed Intersil Packaged Products - Amkor Technology, Philippines (ATP) Product Change Notice PDF 98 KB
PCN12084 - Manufacturing Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia Product Change Notice PDF 135 KB
PCN11020 - Data Sheet Electrical Specification Change for Intersil ISL21440* Product Product Change Notice PDF 79 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB