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The ISL28271 and ISL28272 are dual micropower instrumentation amplifiers (in-amps) optimized for single supply operation over the +2. 4V to +5. 5V range. Both devices feature an Input Range Enhancement Circuit (IREC) which maintains CMRR performance for input voltages equal to the positive and negative supply rails. The input signal is capable of swinging 10% above the positive supply rail and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail. The ISL28271 is compensated for a minimum gain of 10 or more. For higher gain applications, the ISL28272 is compensated for a minimum gain of 100. The in-amps have CMOS input devices for maximum input common voltage range. The amplifiers can be operated from one lithium cell or two Ni-Cd batteries.


  • 120µA typical supply current for both channels
  • 30pA max input bias current
  • 100dB CMRR, PSRR
  • 0.7µV/°C offset voltage temperature coefficient
  • 180kHz 3dB Bandwidth - ISL28271
  • 100kHz 3dB Bandwidth - ISL28272
  • 0.5V/µs slew rate
  • Single supply operation
  • Rail-to-rail input and output (RRIO)
  • Input is capable of swinging above V+ and below V- (ground sensing)
  • 0.081%1 typical gain error - ISL28271
  • -0.19%1 typical gain error - ISL28272
  • Pb-free available (RoHS compliant)


  • Battery- or solar-powered systems
  • Strain gauge
  • Sensor signal conditioning
  • Medical devices
  • Industrial instrumentations

Product Options

Orderable Part ID Part Status Pkg. Type Carrier Type Buy Sample
Obsolete QSOP Tube
Obsolete QSOP Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL28271, ISL28272 Japanese Datasheet Datasheet PDF 112 KB
ISL28271, ISL28272 Datasheet Datasheet PDF 1.01 MB
User Guides & Manuals
ISL2827xINEVAL1Z User Guide Manual PDF 194 KB
Application Notes & White Papers
AN1993: Voltage Feedback versus Current Feedback Operational Amplifiers Application Note PDF 564 KB
AN1298: Instrumentation Amplifier Application Note Application Note PDF 1.59 MB
AN1561: Radiated Interference in Audio Circuits Application Note PDF 556 KB
AN1556: Building an Accurate SPICE Model for Low Noise, Low Power Precision Amplifiers Application Note PDF 976 KB
AN1613: From SPICE Netlist to Allegro Design Sub-Circuit Application Note PDF 1.02 MB
AN1560: Making Accurate Voltage Noise and Current Noise Measurements on Operational Amplifiers Down to 0.1Hz Application Note PDF 2.04 MB
AN1694: The Four Basic Building Blocks of an Op Amp Application Note PDF 357 KB
AN535: Design Considerations for a Data Acquisition System (DAS) Application Note PDF 843 KB
PCN12091 - QSOP and SC-70 from Unisem to CAM as alternate assembly site Product Change Notice PDF 529 KB
TB514: Operational Amplifier Basics Other PDF 519 KB