Home Amplifiers Instrumentation amplifiers
Home
Amplifiers
Instrumentation amplifiers

INA128

ACTIVE

Precision, 130-dB CMRR, 700-µA, Low-Power, Instrumentation Amplifier

Order now
Data sheet

INA128

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 50 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 8 Features Current Feedback, Overvoltage Protection CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/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 125 Type Resistor 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-10 Hz (Typ) (uVpp) 0.2 Gain non-linearity (+/-) (Max) (%) 0.004
Number of channels (#) 1 Vs (Max) (V) 36 Vs (Min) (V) 4.5 Input offset (+/-) (Max) (uV) 50 Gain (Min) (V/V) 1 Gain (Max) (V/V) 10000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 8 Features Current Feedback, Overvoltage Protection CMRR (Min) (dB) 120 Input offset drift (+/-) (Max) (uV/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 125 Type Resistor 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-10 Hz (Typ) (uVpp) 0.2 Gain non-linearity (+/-) (Max) (%) 0.004
PDIP (P) 8 93 mm² 9.81 x 9.43 SOIC (D) 8 19 mm² 3.91 x 4.9
  • Low offset voltage: 50 µV, maximum
  • Low drift: 0.5 µV/°C, maximum
  • Low input bias current: 5 nA, maximum
  • Low noise: 8 nV/√Hz, 0.2 µVpp
  • High CMR: 120 dB, minimum
  • Bandwidth: 1.3 MHz (G = 1)
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Low quiescent current: 700 µA
  • Packages: 8-pin plastic DIP, SO-8
  • Low offset voltage: 50 µV, maximum
  • Low drift: 0.5 µV/°C, maximum
  • Low input bias current: 5 nA, maximum
  • Low noise: 8 nV/√Hz, 0.2 µVpp
  • High CMR: 120 dB, minimum
  • Bandwidth: 1.3 MHz (G = 1)
  • Inputs protected to ±40 V
  • Wide supply range: ±2.25 V to ±18 V
  • Low quiescent current: 700 µA
  • Packages: 8-pin plastic DIP, SO-8

The INA128 and INA129 (INA12x) are low-power, general-purpose instrumentation amplifiers that offer excellent accuracy. The versatile three op amp design and small size make these amplifiers an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation with a 50-kΩ resistor. The INA129 gain equation uses a 49.4-kΩ resistor to allow for drop-in replacements of comparable devices.

The INA12x are available in plastic DIP and surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias current (0.6 nA, max) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.

The INA128 and INA129 (INA12x) are low-power, general-purpose instrumentation amplifiers that offer excellent accuracy. The versatile three op amp design and small size make these amplifiers an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200 kHz at G = 100).

A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation with a 50-kΩ resistor. The INA129 gain equation uses a 49.4-kΩ resistor to allow for drop-in replacements of comparable devices.

The INA12x are available in plastic DIP and surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.

The upgraded INA828 offers a lower input bias current (0.6 nA, max) and lower noise (7 nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.
open-in-new Find other Instrumentation amplifiers
Download

Similar products you might be interested in

open-in-new Compare products
Drop-in replacement with upgraded functionality to the compared device.
INA828 ACTIVE 50-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier Higher precision, lower noise instrumentation amplifier with heavy capacitive load drive capability

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 11
Type Title Date
* Data sheet INA12x Precision, Low-Power Instrumentation Amplifiers datasheet (Rev. F) PDF | HTML 11 May 2022
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 27 Jul 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
Application note Comprehensive Error Calculation for Instrumentation Amplifiers 26 Mar 2019
Application note A Numerical Protection Relay Solution (Rev. A) 26 Jul 2018
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Technical article How to layout a PCB for an instrumentation amplifier 14 Oct 2016
User guide Instrumentation Amplifier With DC Rejection Design Guide 14 May 2015
Technical article Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) 25 Nov 2013
Technical article What you need to know about CMRR – Instrumentation amplifier topologies (Part 3) 06 Nov 2013
Analog Design Journal Getting the most out of your instrumentation amplifier design 10 Oct 2005

Design & development

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

Evaluation board

INAEVM — Universal Instrumentation Amplifier Evaluation Module

The universal INAEVM (Instrumentation Amplifier Evaluation Module) is available in two package options that simplify prototyping precision instrumentation amplifiers in either the SO-8 (D) package or the MSOP-8(DGK) package with the pinout shown.  See the chart in the user guide (...)

User guide: PDF | HTML
View options
Simulation model

INA128 PSpice Model

SBOM764.ZIP (39 KB) - PSpice Model
Download
Simulation model

INA128 TINA TI Reference Design

SBOM762.TSC (88 KB) - TINA-TI Reference Design
Download
Simulation model

INA128 TINA TI Spice Model

SBOM763.ZIP (5 KB) - TINA-TI Spice Model
Download
Calculation tool

ANALOG-ENGINEER-CALC — 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 op-amp gain with feedback (...)
lock = Requires export approval (1 minute)
Download
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Request
Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
User guide: PDF
View options
Reference designs

TIPD191 — Instrumentation Amplifier with DC Rejection Reference Design

This design is an ac coupled instrumentation amplifier. More specifically, the circuit amplifies ac differential input signals and rejects dc differential and common mode signals. The input is dc coupled, so it achieves effective ac coupling by shifting the instrumentation amplifier reference (...)
User guide: PDF
Schematic: PDF
Package Pins Download
PDIP (P) 8 View options
SOIC (D) 8 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos