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Product details

Parameters

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 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) (%) 0.5 Operating temperature range (C) -40 to 125 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 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

Features

  • 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
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Description

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.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet INA333 Micro-Power (50μA), Zerø-Drift, Rail-to-Rail Out Instrumentation Amplifier datasheet (Rev. C) Apr. 08, 2015
Technical articles What is an instrumentation amplifier? Aug. 09, 2019
User guides Universal Difference Amplifier Evaluation Module User's Guide Oct. 16, 2018
Application notes How to Select Amplifiers for Pressure Transmitter Applications Oct. 27, 2017
Application notes Offset Correction Methods: Laser Trim, e-Trim, and Chopper (Rev. A) Jul. 20, 2017
White papers The Signal e-book: A compendium of blog posts on op amp design topics Mar. 28, 2017
Technical articles How to layout a PCB for an instrumentation amplifier Oct. 14, 2016
Application notes 4Q 2015 Analog Applications Journal Oct. 30, 2015
Application notes VCM vs. VOUT plots for instrumentation amplifiers with two op amps Oct. 30, 2015
User guides Single-Supply Analog Input Module With 16-Bit 8-Channel ADC for PLC Design Guide (Rev. A) Jul. 10, 2015
Technical articles How Instrumentation Amplifier Vcm vs. Vout plots change with supply and reference voltage Jan. 30, 2015
User guides PMP9475 Overview Nov. 18, 2014
Technical articles INAs: Offset voltage vs. gain Oct. 10, 2014
Application notes Thermocouple, Cold-Junction Compensation—Analog Approach Aug. 27, 2014
User guides Universal Instrumentation Amplifier EVM User’s Guide Sep. 11, 2013

Design & development

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

Hardware development

EVALUATION BOARDS Download
Description

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 below for compatible TI INA’s. Note (...)

Software development

SUPPORT SOFTWARE Download
SBOC445.ZIP (111 KB)

Design tools & simulation

SIMULATION MODELS Download
SBOC264F.TSC (1395 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SBOM310E.ZIP (11 KB) - TINA-TI Spice Model
SIMULATION MODELS Download
SBOM382F.ZIP (18 KB) - PSpice Model
SIMULATION MODELS Download
SLOM383.TSC (70 KB) - TINA-TI Reference Design
SIMULATION TOOLS Download
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 (...)
Features
  • 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
  • (...)
SIMULATION TOOLS Download
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
CALCULATION TOOLS Download
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 (...)
Features
  • 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
  • (...)
CALCULATION TOOLS Download
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 (...)

Features
  • 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
CALCULATION TOOLS Download
SBOC452I.ZIP (209503 KB)
PCB LAYOUTS Download
TIDU151.PDF (6781 KB)
SCHEMATICS Download
TIDR996.PDF (1397 KB)
SCHEMATICS Download
TIDRF25.PDF (671 KB)

Reference designs

REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
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
REFERENCE DESIGNS Download
Xilinx Artix 7 FPGA with PMBus Power Management Reference Design
PMP7977 The Artix 7 power management reference design board uses power modules, linear regulators, and a PMBus compliant system controller to supply all required core and auxiliary voltages needed by the FPGA, including DDR memory termination. A Digital Power graphical user interface is used to monitor the (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

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