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INA2128

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Dual, Low Power Instrumentation Amplifier

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Data sheet

INA2128

ACTIVE
Data sheet Order now

Product details

Number of channels 2 Vs (max) (V) 36 Vs (min) (V) 4.5 Input offset (±) (max) (µV) 50 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 8 Features Current Feedback, Overvoltage protection CMRR (min) (dB) 120 Input offset drift (±) (max) (µV/°C) 0.5 Input bias current (±) (max) (nA) 5 Iq (typ) (mA) 0.7 Bandwidth at min gain (typ) (MHz) 1.3 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.002 Output swing headroom (to negative supply) (typ) (V) 0.8 Output swing headroom (to positive supply) (typ) (V) -0.9 Input common mode headroom (to negative supply) (typ) (V) 1.7 Input common mode headroom (to positive supply) (typ) (V) -1.4 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.2
Number of channels 2 Vs (max) (V) 36 Vs (min) (V) 4.5 Input offset (±) (max) (µV) 50 Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000 Noise at 1 kHz (typ) (nV√Hz) 8 Features Current Feedback, Overvoltage protection CMRR (min) (dB) 120 Input offset drift (±) (max) (µV/°C) 0.5 Input bias current (±) (max) (nA) 5 Iq (typ) (mA) 0.7 Bandwidth at min gain (typ) (MHz) 1.3 Gain error (±) (max) (%) 0.5 Operating temperature range (°C) -40 to 85 Rating Catalog Type Resistor Gain nonlinearity (±) (max) (%) 0.002 Output swing headroom (to negative supply) (typ) (V) 0.8 Output swing headroom (to positive supply) (typ) (V) -0.9 Input common mode headroom (to negative supply) (typ) (V) 1.7 Input common mode headroom (to positive supply) (typ) (V) -1.4 Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 0.2
SOIC (DW) 16 106.09 mm² (10.3 mm × 10.3 mm)
  • Low offset voltage: 50µV max
  • Low drift: 0.5µV/°C max
  • Low input bias current:
    • 5nA max (CSO: SHE)
    • 0.7nA max (CSO: TID)
  • Input voltage noise: 8nV/√Hz at 1kHz
  • High bandwidth: 1.3 MHz at G=1 V/V
  • High CMR: 120dB min
  • Inputs protected to ±40V
  • Wide supply range: ±2.25V to ±18V
  • Low quiescent current: 700µA per channel
  • Temperature range: –40°C to +85°C
  • Package: 16-pin SOIC
  • Low offset voltage: 50µV max
  • Low drift: 0.5µV/°C max
  • Low input bias current:
    • 5nA max (CSO: SHE)
    • 0.7nA max (CSO: TID)
  • Input voltage noise: 8nV/√Hz at 1kHz
  • High bandwidth: 1.3 MHz at G=1 V/V
  • High CMR: 120dB min
  • Inputs protected to ±40V
  • Wide supply range: ±2.25V to ±18V
  • Low quiescent current: 700µA per channel
  • Temperature range: –40°C to +85°C
  • Package: 16-pin SOIC

The INA2128 is a dual, low-power, general-purpose instrumentation amplifier (IA) offering excellent accuracy. The versatile three-op-amp design and small size make this device an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth, even at high gain (200kHz at G = 100). A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage.

The INA2128 is laser-trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and high common-mode rejection (120dB at G ≥ 100). The device operates with power supplies as low as ±2.25V, and quiescent current is only 700µA per IA—a great choice for battery-operated and multiple-channel systems.

The INA2128 is available in an SOIC-16 package, and is specified from –40°C to +85°C.

The INA2128 is a dual, low-power, general-purpose instrumentation amplifier (IA) offering excellent accuracy. The versatile three-op-amp design and small size make this device an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth, even at high gain (200kHz at G = 100). A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage.

The INA2128 is laser-trimmed for very low offset voltage (50µV), drift (0.5µV/°C) and high common-mode rejection (120dB at G ≥ 100). The device operates with power supplies as low as ±2.25V, and quiescent current is only 700µA per IA—a great choice for battery-operated and multiple-channel systems.

The INA2128 is available in an SOIC-16 package, and is specified from –40°C to +85°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet INA2128 Dual, Low-Power Instrumentation Amplifier datasheet (Rev. C) PDF | HTML Jan 12, 2026
Certificate INA-DUAL-2AMP-EVM EU RoHS Declaration of Conformity (DoC) Sep 7, 2021
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML Jul 27, 2021
E-book The Signal e-book: A compendium of blog posts on op amp design topics PDF | HTML Mar 28, 2017

Design & development

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Evaluation board

INA-DUAL-2AMP-EVM — Universal instrumentation amplifier evaluation module for dual-channel two-amp INA devices

The INA-DUAL-2AMP-EVM is an evaluation module (EVM) that is compatible with a variety of dual-channel two-amp instrumentation amplifiers (INAs). This EVM is compatible with the SOIC-16 (D) and SOIC-16 (DW) INA packages and is designed to evaluate the performance of the devices in both single-supply (...)

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Simulation model

INA2128 PSpice Model (Rev. B)

SBOM022B.ZIP (58 KB) - PSpice model
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Simulation model

INA2128 TINA-TI Reference Design (Rev. C)

SBOC146B (88 KB) - TINA-TI reference design
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Simulation model

INA2128 TINA-TI Spice Model (Rev. B)

SBOM215B.ZIP (6 KB) - TINA-TI Spice model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)

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