The EL2125 is an ultra-low noise, wideband amplifier that runs on half the supply current of competitive parts. It is intended for use in systems such as ultrasound imaging where a very small signal needs to be amplified by a large amount without adding significant noise. Its low power dissipation enables it to be packaged in the tiny SOT-23 package, which further helps systems where many input channels create both space and power dissipation problems. The EL2125 is stable for gains of 10 and greater and uses traditional voltage feedback. This allows the use of reactive elements in the feedback loop, a common requirement for many filter topologies. It operates from ±2. 5V to ±15V supplies and is available in the 5 Ld SOT-23 and 8 Ld SOIC packages. The EL2125 is fabricated using Elantec's proprietary complementary bipolar process, and is specified for operation from -45°C to +85°C.


  • Voltage noise of only 0.83nV/√Hz
  • Current noise of only 2.4pA/√Hz
  • 200µV offset voltage
  • 175MHz -3dB BW for AV = 10
  • Low supply current - 10mA
  • SOT-23 package available
  • ±2.5V to ±15V operation
  • Pb-Free Plus Anneal Available (RoHS Compliant)


  • Ultrasound input amplifiers
  • Wideband instrumentation
  • Communication equipment
  • AGC and PLL active filters
  • Wideband sensors

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Last Time Buy SOICN Tube 97
Last Time Buy SOICN Reel 2500
Last Time Buy SOICN Reel 1000

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
EL2125 Datasheet Datasheet PDF 984 KB
Application Notes & White Papers
How to Bias Op-Amps Correctly Application Note PDF 263 KB
AN1993: Voltage Feedback versus Current Feedback Operational Amplifiers Application Note PDF 564 KB
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
PCN12085 - 8l, 14l, 16l SOIC w/ Gold Bond Wire @ ATP as Alternate Assembly Site Product Change Notice PDF 152 KB
EL2125 Macromodel Model TXT 5 KB
PLC20036 - 2H EOL 2020 Product Life Cycle Notice PDF 319 KB
Analog ICs Brochure 日本語 Brochure PDF 4.20 MB
TB514: Operational Amplifier Basics Other PDF 519 KB
PA14042 - Minimum Line Quantity Change Product Advisory PDF 363 KB
General-purpose operational amplifiers and comparators Pamphlet ( D18268EJ2V0PF00 ) Flyer PDF 1.11 MB