The ISL28191 and ISL28291 are tiny single and dual ultra-low noise, ultra-low distortion operational amplifiers. They are fully specified to operate down to +3V single supply. These amplifiers have outputs that swing rail-to-rail and an input common mode voltage that extends to ground(ground sensing). The ISL28191 and ISL28291 are unity gain stable with an input referred voltage noise of 1. 7nV/√Hz. Both parts feature 0. 00018% THD+N at 1kHz. The ISL28191 is available in the space-saving 6 Ld UTDFN (1. 6mmx1. 6mm) and 6 Ld SOT-23 packages. The ISL28291 is available in the 8 Ld SOIC, 10 Ld 1. 8mmx1. 4mm UTQFN and 10 Ld MSOP packages. All devices are guaranteed over -40°C to +125°C.


  • 1.7nV/√Hz input voltage noise at 1kHz
  • 1kHz THD+N typical 0.00018% at 2VP-P VOUT
  • Harmonic Distortion -76dBc, -70dBc, fo = 1MHz
  • 61MHz -3dB bandwidth
  • 630µV maximum offset voltage
  • 3µA input bias current
  • 100dB typical CMRR
  • 3V to 5.5V single supply voltage range
  • Rail-to-rail output
  • Ground Sensing
  • Enable pin (not available in the 8 Ld SOIC package option)
  • Pb-free (RoHS compliant)


  • Low noise signal processing
  • Low noise microphones/preamplifiers
  • ADC buffers
  • DAC output amplifiers
  • Digital scales
  • Strain gauges/sensor amplifiers
  • Radio systems
  • Portable equipment
  • Infrared detectors


Title language Type Format File Size Date
star ISL28191, ISL28291 Datasheet Datasheet PDF 1.99 MB
How to Bias Op-Amps Correctly Application Note PDF 263 KB
AN1993: Voltage Feedback versus Current Feedback Operational Amplifiers Application Note PDF 564 KB
AN1299: Measuring RF Interference in Audio Circuits Application Note PDF 679 KB
AN1548: Designer's Manual for the iSim Active Filter Designer Application Note PDF 8.19 MB
AN1556: Building an Accurate SPICE Model for Low Noise, Low Power Precision Amplifiers Application Note PDF 976 KB
AN1560: Making Accurate Voltage Noise and Current Noise Measurements on Operational Amplifiers Down to 0.1Hz Application Note PDF 2.04 MB
AN1561: Radiated Interference in Audio Circuits Application Note PDF 556 KB
AN1613: From SPICE Netlist to Allegro Design Sub-Circuit Application Note PDF 1.02 MB
AN1694: The Four Basic Building Blocks of an Op Amp Application Note PDF 357 KB
AN1827: High-Side, High Current Sensing Techniques Application Note PDF 419 KB
AN535: Design Considerations for a Data Acquisition System (DAS) Application Note PDF 843 KB
Analog ICs Brochure 日本語 Brochure PDF 2.72 MB
General-purpose operational amplifiers and comparators Pamphlet ( D18268EJ2V0PF00 ) Flyer PDF 1.11 MB
ISL2819xEVAL1Z User Guide Manual - Development Tools PDF 441 KB
TB514: Operational Amplifier Basics Other PDF 519 KB
PA14045 - Data Sheet Specification Change for Intersil Product ISL28191* and ISL28291* Product Advisory PDF 291 KB
PCN13022 - Alternate Manufacturing Site for Assembly of the Listed Intersil SOT23 Packaged Products - Carsem (CAM) Ipoh, Malaysia Product Change Notice PDF 557 KB
PCN12084 - Manufacturing Site Change for the Listed Intersil Products - Carsem (CAS) Ipoh Malaysia Product Change Notice PDF 135 KB
PCN10114 - Part Marking Configuration Change for Intersil TDFN, uTDFN, and uTQFN Packaged Products Product Change Notice PDF 205 KB


Title language Type Format File Size Date
isl28191 Model - Other TXT 5 KB

memoryBoards & Kits

Part Number Title Type Company
ISL28191EVAL1Z Single Supply, Ultra-Low Noise, Low Distortion, Rail-to-Rail Output Op Amp Evaluation Board Evaluation Renesas