High bandwidth (4.7MHz), low noise (7nV/√Hz), precision (35μV), low-power, instrumentation amp


Product details


Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 35 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 7 Features Super-beta, Small Size, Overvoltage Protection CMRR (Min) (dB) 136 Input offset drift (+/-) (Max) (uV/C) 0.4 Input bias current (+/-) (Max) (nA) 0.5 Iq (Typ) (mA) 0.6 Bandwidth at min gain (Typ) (MHz) 4.7 Gain error (+/-) (Max) (%) 0.15 Operating temperature range (C) -40 to 125 Type Resistor Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 0.14 Gain non-linearity (+/-) (Max) (%) 0.0015 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (DRG) 8 9 mm² 3 x 3 open-in-new Find other Instrumentation amplifiers


  • Low offset voltage: 10 µV (typ), 35 µV (max)
  • Gain drift: 5 ppm/°C (G = 1),
    35 ppm/°C (G > 1) (max)
  • Noise: 7 nV/√Hz
  • Bandwidth: 4.7 MHz (G = 1), 290 kHz (G = 100)
  • Stable with 1-nF capacitive loads
  • Inputs protected up to ±40 V
  • Common-mode rejection: 112 dB, G = 10 (min)
  • Power supply rejection: 110 dB, G = 1 (min)
  • Supply current: 650 µA (max)
  • Supply range:
    • Single-supply: 4.5 V to 36 V
    • Dual-supply: ±2.25 V to ±18 V
  • Specified temperature range: –40°C to +125°C
  • Packages: 8-pin SOIC, VSSOP, and WSON
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The INA821 is a high-precision instrumentation amplifier that offers low power consumption and operates over a wide single-supply or dual-supply range. A single external resistor sets any gain from 1 to 10,000. The device has high precision as a result of super-beta input transistors, which provide low input offset voltage, offset voltage drift, input bias current, and input voltage and current noise. Additional circuitry protects the inputs against overvoltage up to ±40 V.

The INA821 is optimized to provide a high common-mode rejection ratio. At G = 1, the common-mode rejection ratio exceeds 92 dB across the full input common-mode range. The device is designed for low-voltage operation from a 4.5-V single supply, and dual supplies up to ±18 V.

The INA821 is available in 8-pin SOIC, VSSOP, and WSON packages, and is specified over the –40°C to +125°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet INA821 35-µV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier datasheet (Rev. D) Jun. 15, 2020
White paper 設計準確且多功能的鋰離子 電池測試解決方案 Nov. 10, 2020
Technical article How to design one battery tester for a wide range of sizes, voltages and form factors Nov. 04, 2020
White paper Designing an Accurate, Multifunction Lithium-Ion Battery-Testing Solution Sep. 24, 2020
Application note Difference Between an Instrumentation Amplifier and a Current Sense Amplifier Apr. 03, 2020
User guide Universal Instrumentation Amplifier EVM: Alternate Pinout User's Guide Feb. 07, 2020
Application note Precision signal conditioning for safety-enabled AIMs in factory automation Sep. 30, 2019
Technical article What is an instrumentation amplifier? Aug. 09, 2019
Application note Precision signal-conditioning solutions for motor control with position feedback Jun. 14, 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers Mar. 26, 2019
Application note Simplify Voltage and Current Measurement in Battery Test Equipment Oct. 16, 2017
Technical article How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
User guide Universal Instrumentation Amplifier EVM User’s Guide (Rev. B) Aug. 09, 2016
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) Nov. 25, 2013
Application note Getting the most out of your instrumentation amplifier design Oct. 10, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The INA826EVM is intended to provide basic functional evaluation of the INA826.

  • Intuitive evaluation with the silkscreen schematic
  • Easy access to nodes with surface-mount test points
  • Advanced evaluation with two prototype areas
  • Reference voltage source flexibility
  • Convenient input and output filtering
document-generic User guide
The universal INAEVM-ALT-SO8 (instrumentation amplifier evaluation module with alternate pin-out) is available to simplify prototyping precision instrumentation amplifiers in the SO-8 (D) package with the pinout shown.  See the chart below for compatible TI INA devices. Note: These boards are (...)
  • Intuitive evaluation
  • Easy access to nodes with suface-mount test points
  • Reference voltage source flexibility
  • Convenient input and output filtering

Design tools & simulation

SBOMAQ4A.TSC (1644 KB) - TINA-TI Reference Design
SBOMAQ5A.ZIP (11 KB) - TINA-TI Spice Model
SBOMAQ6A.ZIP (31 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide
Analog engineer's calculator
ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)

Reference designs

Digital control reference design for cost-optimized battery test systems
TIDA-010086 — This reference design provides a cost-effective solution for battery formation and test applications. This design uses the C2000™ real-time control MCU for high-resolution pulse-width modulation (PWM) generation, and constant-current (CC) and constant-voltage (CV)
control loops. It efficiently (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
SON (DRG) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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  • Ongoing reliability monitoring

Support & training

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