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INA333

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Low-Power, Zero-Drift, Precision Instrumentation Amplifier

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Data sheet

INA333

ACTIVE
Data sheet Order now

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 Output swing headroom (to negative supply) (Typ) (V) 0.05 Output swing headroom (to positive supply) (Typ) (V) -0.05 Input common mode headroom (to negative supply) (Typ) (V) 0.1 Input common mode headroom (to positive supply) (Typ) (V) -0.1 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 Gain non-linearity (+/-) (Max) (%) 0.001
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 Output swing headroom (to negative supply) (Typ) (V) 0.05 Output swing headroom (to positive supply) (Typ) (V) -0.05 Input common mode headroom (to negative supply) (Typ) (V) 0.1 Input common mode headroom (to positive supply) (Typ) (V) -0.1 Noise at 0.1 Hz-10 Hz (Typ) (uVpp) 1 Gain non-linearity (+/-) (Max) (%) 0.001
VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (DRG) 8 9 mm² 3 x 3
  • 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
  • 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

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.

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

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Type Title Date
* Data sheet INA333 Micro-Power (50μA), Zerø-Drift, Rail-to-Rail Out Instrumentation Amplifier datasheet (Rev. C) PDF | HTML 08 Apr 2015
More literature Bridge Sensor Solution PDF | HTML 25 May 2022
Application note How to Select Amplifiers for Pressure Transmitter Applications (Rev. A) PDF | HTML 27 Jul 2021
Application note Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps PDF | HTML 27 Jul 2021
Application note Offset Correction Methods: Laser Trim, e-Trim, and Chopper (Rev. C) PDF | HTML 13 Apr 2021
Technical article What is an instrumentation amplifier? 09 Aug 2019
EVM User's guide Universal Difference Amplifier Evaluation Module User's Guide 16 Oct 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
Analog Design Journal 4Q 2015 Analog Applications Journal 30 Oct 2015
Analog Design Journal VCM vs. VOUT plots for instrumentation amplifiers with two op amps 30 Oct 2015
User guide Single-Supply Analog Input Module With 16-Bit 8-Channel ADC for PLC Design Guide (Rev. A) 10 Jul 2015
Technical article How Instrumentation Amplifier Vcm vs. Vout plots change with supply and reference voltage 30 Jan 2015
Test report PMP9475 Overview 18 Nov 2014
Technical article INAs: Offset voltage vs. gain 10 Oct 2014
Application note Thermocouple, Cold-Junction Compensation—Analog Approach 27 Aug 2014

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 (...)

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Support software

Thermocouple Compensation - Analog Approach (Supporting SW)

SBOC445.ZIP (111 KB)
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Simulation model

INA333 TINA-TI Reference Design (Rev. F) INA333 TINA-TI Reference Design (Rev. F)

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Simulation model

INA333 TINA-TI Spice Model (Rev. E) INA333 TINA-TI Spice Model (Rev. E)

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Simulation model

INA333 PSpice Model (Rev. F) INA333 PSpice Model (Rev. F)

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Simulation model

INA333 Vcm vs Vout TINA-TI Model INA333 Vcm vs Vout TINA-TI Model

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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 (...)
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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 (...)
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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 (...)
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Schematic

PMP9475 Schematic PMP9475 Schematic

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Schematic

TIPD166 Schematic TIPD166 Schematic

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PCB layout

PMP7977 PCB PMP7977 PCB

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Reference designs

TIDA-010065 — High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design

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 (...)
document-generic Schematic
Reference designs

TIDA-00440 — Leakage Current Measurement Reference Design for Determining Insulation Resistance

This reference design measures insulation resistance up to 100 MΩ. It has an on-board isolated 500-Vdc 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 transformer and motor windings.
document-generic Schematic
Reference designs

TIDA-01214 — Isolated, High-Accuracy Analog Input Module Reference Design Using 16-Bit ADC and Digital Isolator

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 (...)
document-generic Schematic
Reference designs

TIPD170 — Single-Supply Strain Gauge in a Bridge Configuration Reference Design

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 (...)
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Reference designs

TIPD166 — Single Supply Analog Input Module Reference Design with 16-Bit, 8-Channel ADC for PLC

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 (...)
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document-pdfAcrobat User guide
Reference designs

PMP9475 — Xilinx Virtex UltraScale FPGA Power Solution with PMBus Reference Design

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 (...)
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Reference designs

PMP9444 — Xilinx Kintex UltraScale FPGA Power Solution Reference Design with PMBus

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

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