Product details


Number of channels (#) 1 Vs (Max) (V) 5.5 Vs (Min) (V) 1.8 Input offset (+/-) (Max) (uV) 25 Gain (Min) (V/V) 1 Gain (Max) (V/V) 1000 Noise at 1 kHz (Typ) (nV/rt (Hz)) 50 Features Zero Drift, Small Size, Low power CMRR (Min) (dB) 100 Input offset drift (+/-) (Max) (uV/C) 0.1 Input bias current (+/-) (Max) (nA) 0.2 Iq (Typ) (mA) 0.05 Bandwidth at min gain (Typ) (MHz) 0.15 Gain error (+/-) (Max) (%) 0.25 Operating temperature range (C) -40 to 125 Type Resistor Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 Gain non-linearity (+/-) (Max) (%) 0.001 open-in-new Find other Instrumentation amplifiers

Package | Pins | Size

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: 25 µV (Maximum), G ≥ 100
  • Low Drift: 0.1 µV/°C, G ≥ 100
  • Low Noise: 50 nV/√Hz, G ≥ 100
  • High CMRR: 100 dB (Minimum), G ≥ 10
  • Low Input Bias Current: 200 pA (Maximum)
  • Supply Range: 1.8 V to 5.5 V
  • Input Voltage: (V–) +0.1 V to (V+) –0.1 V
  • Output Range: (V–) +0.05 V to (V+) –0.05 V
  • Low Quiescent Current: 50 µA
  • Operating Temperature: –40°C to +125°C
  • RFI Filtered Inputs
  • 8-Pin VSSOP and 8-Pin WSON Packages
open-in-new Find other Instrumentation amplifiers


The INA333 device is a low-power, precision instrumentation amplifier offering excellent accuracy. The versatile 3-operational amplifier design, small size, and low power make it ideal for a wide range of portable applications.

A single external resistor sets any gain from 1 to 1000. The INA333 is designed to use an industry-standard gain equation: G = 1 + (100 kΩ / RG).

The INA333 device provides very low offset voltage (25 µV, G ≥ 100), excellent offset voltage drift (0.1 µV/°C, G ≥ 100), and high common-mode rejection (100 dB at G ≥ 10). It operates with power supplies as low as 1.8 V (±0.9 V) and quiescent current is only 50 µA, making it ideal for battery-operated systems. Using autocalibration techniques to ensure excellent precision over the extended industrial temperature range, the INA333 device also offers exceptionally low noise density (50 nV/√Hz) that extends down to DC.

The INA333 device is available in both 8-pin VSSOP and WSON surface-mount packages and is specified over the TA = –40°C to +125°C temperature range.

open-in-new Find other Instrumentation amplifiers

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 14
Type Title Date
* Data sheet INA333 Micro-Power (50μA), Zerø-Drift, Rail-to-Rail Out Instrumentation Amplifier datasheet (Rev. C) Apr. 08, 2015
Application note Offset Correction Methods: Laser Trim, e-Trim, and Chopper (Rev. C) Apr. 13, 2021
Technical article What is an instrumentation amplifier? Aug. 09, 2019
User guide Universal Difference Amplifier Evaluation Module User's Guide Oct. 16, 2018
Application note How to Select Amplifiers for Pressure Transmitter Applications Oct. 27, 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical article How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
Application note 4Q 2015 Analog Applications Journal Oct. 30, 2015
Application note VCM vs. VOUT plots for instrumentation amplifiers with two op amps Oct. 30, 2015
User guide Single-Supply Analog Input Module With 16-Bit 8-Channel ADC for PLC Design Guide (Rev. A) Jul. 10, 2015
Technical article How Instrumentation Amplifier Vcm vs. Vout plots change with supply and reference voltage Jan. 30, 2015
User guide PMP9475 Overview Nov. 18, 2014
Technical article INAs: Offset voltage vs. gain Oct. 10, 2014
Application note Thermocouple, Cold-Junction Compensation—Analog Approach Aug. 27, 2014

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 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 (...)

Software development

SBOC445.ZIP (111 KB)

Design tools & simulation

SBOC264F.TSC (1395 KB) - TINA-TI Reference Design
SBOM310E.ZIP (11 KB) - TINA-TI Spice Model
SBOM382F.ZIP (18 KB) - PSpice Model
SLOM383.TSC (70 KB) - TINA-TI Reference Design
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
  • (...)
Common-Mode Input Range Calculator for Instrumentation Amplifiers
INA-CMV-CALC The Common-Mode Input Range Calculator is tool for quickly generating plots of an instrumentation amplifier’s common-mode input range vs output. The tool is compatible with both 2-amp and 3-amp instrumentation amplifiers utilizing any supply range.

The Common-Mode Input Range Calculator is pre-loaded (...)

  • Preloaded with 20 of TI’s most popular instrumentation amplifier specifications
  • Customizable supply, gain, and voltage reference options
  • Calculator displays output limitations graphically and numerically
TIDR996.PDF (1397 KB)
TIDRF25.PDF (671 KB)
TIDU151.PDF (6781 KB)

Reference designs

High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design
TIDA-010065 — This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom for (...)
document-generic Schematic document-generic User guide
Isolated, High-Accuracy Analog Input Module Reference Design Using 16-Bit ADC and Digital Isolator
TIDA-01214 — This reference design provides accurate measurements of AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range, covering protection and measurement range (including sampling requirements of IEC 61850-9-2), simplifying system design and improving trip time performance (...)
document-generic Schematic document-generic User guide
Leakage Current Measurement Reference Design for Determining Insulation Resistance
TIDA-00440 This TI design provides a reference solution to measure Insulation Resistance up to 100MΩ. It has an on-board isolated 500Vdc power supply and an isolated signal conditioning circuit to measure the leakage current. This design is useful to find leakage due to insulation breakdown in (...)
document-generic Schematic document-generic User guide
Single-Supply Strain Gauge in a Bridge Configuration Reference Design
TIPD170 This strain gauge reference design accurately measures the resistance of a strain gauge by being placed in a bridge configuration. The differential voltage of the bridge produced by variation in strain gauge resistance is amplified using the INA333. The bridge excitation voltage and INA333 reference (...)
document-generic Schematic document-generic User guide
Design files
Single Supply Analog Input Module Reference Design with 16-Bit, 8-Channel ADC for PLC
TIPD166 This design is for a 16-bit, 8-channel analog input module for industrial programmable logic controller (PLC) systems. The circuit is realized with an 8-channel, 16-bit, successive-approximation-register (SAR), analog-to-digital converter (ADC) with an integrated precision reference and analog (...)
document-generic Schematic document-generic User guide
Xilinx Virtex UltraScale FPGA Power Solution with PMBus Reference Design
PMP9475 The PMP9475 12V-input reference design provides all the power supply rails necessary to power Xilinx's Virtex® UltraScale™ family of FPGAs in  a compact, highly efficient design.  This design uses several of TI's PMBus Point-Of-Load voltage regulators for ease of (...)
document-generic Schematic document-generic User guide
Xilinx Kintex UltraScale FPGA Power Solution Reference Design with PMBus
PMP9444 The PMP9444 reference design provides all the power supply rails necessary to power Xilinx's Kintex UltraScale family of FPGAs.  It features two UCD90120A's for flexible power up and power down sequencing as well as voltage monitoring, current monitoring, and voltage margining through the (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

Ordering & quality

Information included:
  • RoHS
  • 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

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. ​​​​​​​​​​​​​​