Product details

Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 1.8 Rail-to-rail In, Out GBW (Typ) (MHz) 20 Slew rate (Typ) (V/us) 10 Vos (offset voltage @ 25 C) (Max) (mV) 2 Iq per channel (Typ) (mA) 1.6 Vn at 1 kHz (Typ) (nV/rtHz) 8.5 Rating Catalog Operating temperature range (C) -40 to 125 Offset drift (Typ) (uV/C) 1.8 Features Shutdown, Zero Crossover Input bias current (Max) (pA) 10 CMRR (Typ) (dB) 100 Output current (Typ) (mA) 65 Architecture CMOS
Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 1.8 Rail-to-rail In, Out GBW (Typ) (MHz) 20 Slew rate (Typ) (V/us) 10 Vos (offset voltage @ 25 C) (Max) (mV) 2 Iq per channel (Typ) (mA) 1.6 Vn at 1 kHz (Typ) (nV/rtHz) 8.5 Rating Catalog Operating temperature range (C) -40 to 125 Offset drift (Typ) (uV/C) 1.8 Features Shutdown, Zero Crossover Input bias current (Max) (pA) 10 CMRR (Typ) (dB) 100 Output current (Typ) (mA) 65 Architecture CMOS
SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • Gain Bandwidth: 20 MHz
  • Low Noise: 8.5 nV√Hz at 1 kHz
  • Slew Rate: 10 V/µs
  • Low THD+N: 0.0005%
  • Rail-to-Rail I/O
  • Offset Voltage: 2 mV (maximum)
  • Supply Voltage: 1.8 V to 5.5 V
  • Supply Current: 1.5 mA/ch
    • Shutdown: 0.1 µA/ch
  • Unity-Gain Stable
  • Small Packages:
    • SOT-23, SON, VSSOP, TSSOP
  • Gain Bandwidth: 20 MHz
  • Low Noise: 8.5 nV√Hz at 1 kHz
  • Slew Rate: 10 V/µs
  • Low THD+N: 0.0005%
  • Rail-to-Rail I/O
  • Offset Voltage: 2 mV (maximum)
  • Supply Voltage: 1.8 V to 5.5 V
  • Supply Current: 1.5 mA/ch
    • Shutdown: 0.1 µA/ch
  • Unity-Gain Stable
  • Small Packages:
    • SOT-23, SON, VSSOP, TSSOP

The OPAx322x series consists of single, dual, and quad-channel CMOS operational amplifiers featuring low noise and rail-to-rail inputs and outputs optimized for low-power, single-supply applications. Specified over a wide supply range of 1.8 V to 5.5 V, the low quiescent current of only 1.5 mA per channel makes these devices well-suited for power-sensitive applications.

The combination of very low noise (8.5 nV√Hz at 1 kHz), high-gain bandwidth (20 MHz), and fast slew rate (10 V/µs) make the OPAx322x family ideal for a wide range of applications, including signal conditioning and sensor amplification requiring high gains. Featuring low THD+N, the OPAx322x series is also excellent for consumer audio applications, particularly for single-supply systems.

The OPAx322S models include a shutdown mode that allow the amplifiers to be switched from normal operation to a standby current that is typically less than 0.1 µA.

The OPA322 (single version) is available in 5-pin SOT-23 and 6-pin SOT-23, while the OPA2322 (dual version) is offered in 8-pin VSSOP, 10-pin VSSOP, 8-pin SOIC, and 8-pin SON packages. The quad version OPA4322 comes in 14-pin TSSOP and 16-pin TSSOP packages. All versions are specified for operation from –40°C to +125°C.

The OPAx322x series consists of single, dual, and quad-channel CMOS operational amplifiers featuring low noise and rail-to-rail inputs and outputs optimized for low-power, single-supply applications. Specified over a wide supply range of 1.8 V to 5.5 V, the low quiescent current of only 1.5 mA per channel makes these devices well-suited for power-sensitive applications.

The combination of very low noise (8.5 nV√Hz at 1 kHz), high-gain bandwidth (20 MHz), and fast slew rate (10 V/µs) make the OPAx322x family ideal for a wide range of applications, including signal conditioning and sensor amplification requiring high gains. Featuring low THD+N, the OPAx322x series is also excellent for consumer audio applications, particularly for single-supply systems.

The OPAx322S models include a shutdown mode that allow the amplifiers to be switched from normal operation to a standby current that is typically less than 0.1 µA.

The OPA322 (single version) is available in 5-pin SOT-23 and 6-pin SOT-23, while the OPA2322 (dual version) is offered in 8-pin VSSOP, 10-pin VSSOP, 8-pin SOIC, and 8-pin SON packages. The quad version OPA4322 comes in 14-pin TSSOP and 16-pin TSSOP packages. All versions are specified for operation from –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet OPAx322x 20-MHz, Low-Noise, 1.8-V, RRI/O, CMOS Operational Amplifier With Shutdown datasheet (Rev. F) PDF | HTML 23 Dec 2016
Circuit design Single-supply, high-input voltage, full-wave rectifier circuit PDF | HTML 13 Apr 2021
Circuit design Discrete Wide Bandwidth INA Circuit (Rev. A) PDF | HTML 23 Dec 2020
Technical article What is an op amp? 21 Jan 2020
Circuit design Photodiode amplifier circuit (Rev. A) 04 Feb 2019
Circuit design Half-wave rectifier circuit (Rev. A) 01 Feb 2019
E-book Analog Engineer’s Pocket Reference Guide Fifth Edition (Rev. C) 30 Nov 2018
Technical article How to lay out a PCB for high-performance, low-side current-sensing designs 06 Feb 2018
Technical article Low-side current sensing for high-performance cost-sensitive applications 22 Jan 2018
Technical article Voltage and current sensing in HEV/EV applications 22 Nov 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Application note Zero-crossover Amplifiers: Features and Benefits (Rev. A) PDF | HTML 09 Feb 2017
Application note OPA322, OPA2322, OPA4322 EMIR Immunity Performance 15 Nov 2012

Design & development

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

Evaluation board

DIP-ADAPTER-EVM — DIP adapter evaluation module

Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.

The (...)

User guide: PDF
Not available on TI.com
Evaluation board

DIYAMP-EVM — Universal Do-It-Yourself (DIY) Amplifier Circuit Evaluation Module

The DIYAMP-EVM is a unique evaluation module (EVM) family that provides engineers and do it yourselfers (DIYers) with real-world amplifier circuits, enabling you to quickly evaluate design concepts and verify simulations. It is available in three industry-standard packages (SC70, SOT23, SOIC) and (...)
User guide: PDF | HTML
Simulation model

OPAx322 TINA-TI Spice Model (Rev. C)

SBOM454C.ZIP (10 KB) - TINA-TI Spice Model
Simulation model

OPAx322 TINA-TI Reference Design (Rev. C)

SBOM455C.TSC (315 KB) - TINA-TI Reference Design
Simulation model

OPAx322 PSpice Model (Rev. F)

SBOM888F.ZIP (30 KB) - PSpice Model
Simulation model

SBOA258 TINA-TI Reference Design

SBOMAU6.ZIP (203 KB) - TINA-TI Reference Design
Simulation model

Bridge Sensor Solution TINA-TI Reference Design

SBOMC56.ZIP (68 KB) - TINA-TI Reference Design
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 (...)
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
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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Design tool

CIRCUIT060009 — Half-wave rectifier circuit

The precision half-wave rectifier inverts and transfers only the negative-half input of a time varying input signal (preferably sinusoidal) to its output. By appropriately selecting the feedback resistor values, different gains can be achieved. Precision half-wave rectifiers are commonly used with (...)
Design tool

CIRCUIT060013 — Inverting amplifier with T-network feedback circuit

This design inverts the input signal, VIN, and applies a signal gain of 1000 V/V or 60 dB. The inverting amplifier with T-feedback network can be used to obtain a high gain without a small value for R4 or very large values for the feedback resistors.
Design tool

CIRCUIT060015 — Adjustable reference voltage circuit

This circuit combines an inverting and non-inverting amplifier to make a reference voltage adjustable from the negative of the input voltage up to the input voltage. Gain can be added to increase the maximum negative reference level.
Design tool

CIRCUIT060018 — Photodiode amplifier circuit

This circuit consists of an op amp configured as a transimpedance amplifier for amplifying the light dependent current of a photodiode.
User guide: PDF
Design tool

CIRCUIT060060 — Single-supply, high-input voltage, full-wave rectifier circuit

This single-supply precision full-wave rectifier is optimized for high-input voltages. When Vi > 0 V, D1 is reverse biased and the top part of the circuit, U1, is activated resulting in a circuit with a gain of 1 V/V. When Vi < 0 V, D1 is forward biased and the bottom part of the circuit, U2, is (...)
User guide: PDF
Design tool

CIRCUIT060068 — Discrete wide bandwidth instrumentation amplifier circuit

This design uses three op–amps to build a discrete wide bandwidth instrumentation amplifier. The circuit converts a differential, high frequency signal to a single–ended output.
Design tool

CIRCUIT060074 — High-side current sensing with comparator circuit

This high-side, current sensing solution uses one comparator with a rail-to-rail input common mode range to create an over-current alert (OC-Alert) signal at the comparator output (COMP OUT) if the load current rises above 1 A. The OC-Alert signal in this implementation is active low. So when the (...)
Design tool

Simulation for Half-Wave Rectifier

SBOC509.ZIP (363 KB)
Design tool

Simulation for Photodiode Amplifier

SBOC517.ZIP (258 KB)
Reference designs

TIDA-010231 — Analog front end for arc detection in photovoltaic applications reference design

This reference design implements a four-channel analog front end for DC arc detection in photovoltaic systems, supports DC voltages up tp 1000 V and currents up to 10 A. Arcing is detected by analyzing the AC noise present on the DC current between the solar panels and inverter. The signal is (...)
Reference designs

TIDA-00201 — Differential Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors

This design provides a 4-channel signal conditioning solution for differential ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external differential SAR ADCs as well as circuits for high-speed (...)
Schematic: PDF
Reference designs

TIDA-00208 — Single-Ended Signal Conditioning Circuit for Current and Voltage Measurement Using Fluxgate Sensors

This design provides a 4-channel signal conditioning solution for single-ended SAR ADCs integrated into a microcontroller measuring motor current using fluxgate sensors. Also provided is an alternative measurement circuit with external SAR ADCs as well as circuits for high-speed overcurrent and (...)
Schematic: PDF
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 (...)
Schematic: PDF
Reference designs

TIDA-00499 — Transient and Digital Fault Recorder AFE Using Differential Amplifiers and HS ADC Reference Design

While Digital Fault Recorders (DFRs) can detect transients in 17/20 μs at 60/50 Hz, transient recorders capture disturbances that can peak and decay well within a microsecond. This reference design demonstrates the capturing of transient inputs at up to 1 MHz for DFR and 25 MHz for (...)
Schematic: PDF
Reference designs

TIDM-TM4C129POEAUDIO — Audio Communication With Power Over Ethernet (PoE) Reference Design

This design uses Texas Instrument's high performance TM4C129x microcontrollers (MCUs) with integrated Ethernet PHY to capture, exchange and playback audio efficiently with power supplied over the network (PoE solution) instead of separate external power sources. The application uses TivaWare (...)
Schematic: PDF
Reference designs

TIDA-00368 — Reference Design for Interfacing Current Output Hall Sensors and CTs with Differential ADC/MCU

This reference design provides interfacing current output Hall sensors and current transformers to differential ADC (standalone and integrated into MCU). The differential signal conditioning circuit is designed to measure motor current with an accuracy of ±0.5% across operating (...)
Schematic: PDF
Package Pins Download
SOT-23 (DBV) 5 View options
SOT-23 (DBV) 6 View options

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