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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments OPA4322AIPW

Name: OPA4322AIPW
Brand: Texas Instruments
SKU: OPA4322AIPW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: OPA4322AIPW

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: OPA4322AIPW.pdf

Description:: IC CMOS 4 CIRCUIT 14TSSOP

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Product details

Overview

OPA4322AIPW from Texas Instruments is a quad-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, single-supply signal conditioning. It delivers 20 MHz gain bandwidth, 8.5 nV/√Hz input voltage noise at 1 kHz, 10 V/μs slew rate, 1.4–1.65 mA per channel quiescent current (at 5.5 V), and operates from 1.8 V to 5.5 V supply. It is used in multi-channel sensor front-ends requiring precision, low-noise amplification with minimal power overhead.

For engineers reviewing the OPA4322AIPW datasheet, OPA4322AIPW pinout, OPA4322AIPW application, or OPA4322AIPW equivalent, key selection criteria include its quad-channel rail-to-rail I/O performance, shutdown capability (0.1 µA/ch), ±0.1 V input common-mode range beyond rails, and guaranteed 2 mV max offset voltage across –40°C to +125°C - critical for high-accuracy analog signal chains in space-constrained industrial and portable systems.

Technical Context

The OPA4322AIPW implements a zero-crossover rail-to-rail input stage that eliminates distortion near supply rails, enabling accurate amplification of signals spanning the full 1.8 V to 5.5 V supply range. Its unity-gain stable architecture supports direct use in active filters, transimpedance configurations, and closed-loop gain stages without external compensation.

Each of the four independent amplifiers features dedicated input pairs (±IN) and outputs (OUT), with shared V+ and V− supplies and dual-group shutdown control (SHDN A/B and SHDN C/D). The device's low 0.6 fA/√Hz input current noise and 2.8 µVPP 0.1–10 Hz flicker noise support high-impedance sensor interfaces such as piezoelectric or capacitive transducers.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	20 MHz - enables stable unity-gain operation and supports >100 kHz closed-loop bandwidth in 4× gain configurations.
Input Voltage Noise Density	8.5 nV/√Hz at 1 kHz - ensures minimal added noise in audio and precision sensor signal chains.
Slew Rate	10 V/μs - supports fast transient response for pulse amplification and multi-pole filter settling within sub-microsecond windows.
Offset Voltage (max)	2 mV - guarantees ≤20 mV output error at G = 10, suitable for 12-bit system accuracy without trimming.
Supply Current / Channel	1.4–1.65 mA at 5.5 V - allows four independent amplifiers to operate under 7 mA total, ideal for battery-powered instrumentation.
Shutdown Current / Channel	0.1 µA - reduces total quiescent draw to <0.5 µA when fully disabled, extending standby time in intermittent-sampling systems.
Common-Mode Input Range	(V−) − 0.1 V to (V+) + 0.1 V - permits direct interfacing with unbuffered ADC references and rail-swinging sensors.

Pinout & Package

OPA4322AIPW is housed in a 14-pin TSSOP package (PW) with nominal body size 5.00 mm × 4.40 mm and exposed thermal pad on underside. Pin 11 is V−, pin 4 is V+, and pins are arranged to support compact, symmetrical layout of four independent op-amp channels.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT A	Amplifier A output - drives loads up to 10 kΩ with rail-to-rail swing (≤20 mV from rails).
2	–IN A	Inverting input, channel A - matched to +IN A for <2 mV offset; accepts common-mode voltages down to V− − 0.1 V.
3	+IN A	Noninverting input, channel A - high-impedance (±0.2 pA bias current), compatible with high-Z sources like photodiodes.
4	V+	Positive supply - accepts 1.8 V to 5.5 V; must be decoupled locally with ≥0.1 µF ceramic capacitor.
5	+IN B	Noninverting input, channel B - electrically identical to +IN A; enables differential pair or parallel gain staging.
6	–IN B	Inverting input, channel B - shares same CMRR (90–100 dB) and PSR (10–50 µV/V) as channel A.
7	OUT B	Amplifier B output - independently buffered; no crosstalk degradation above 130 dB at 1 kHz.
8	OUT C	Amplifier C output - supports third channel in multi-stage filtering or multi-sensor acquisition.
9	–IN C	Inverting input, channel C - pin 9 in PW package; routing symmetry aids layout repeatability across all four channels.
10	+IN C	Noninverting input, channel C - matches input capacitance (4 pF common-mode, 5 pF differential) for consistent frequency response.
11	V−	Negative supply - reference node for all amplifiers; connects to PCB ground plane or negative rail in split-supply designs.
12	+IN D	Noninverting input, channel D - completes quad set; supports simultaneous 4-channel analog front-end in compact footprint.
13	–IN D	Inverting input, channel D - enables fourth independent gain path with identical THD+N (0.0005% at 10 kHz).
14	OUT D	Amplifier D output - fully specified for 0.1% settling in 0.25 µs, supporting high-speed multiplexed sampling.

Key Features

Feature	Design Value
Zero-crossover RRI/O input stage	Eliminates crossover distortion at rail transitions, preserving waveform fidelity in Class-AB-like signal paths without external biasing.
Low 1/f noise (2.8 µVPP, 0.1–10 Hz)	Reduces baseline drift in DC-coupled sensor interfaces, enabling stable 16-bit-equivalent resolution over seconds-long integration windows.
Dual-group shutdown (SHDN A/B, SHDN C/D)	Allows selective disabling of two amplifier pairs - e.g., keep channels A/B active for real-time monitoring while powering down C/D for sleep mode.
High open-loop gain (100–130 dB)	Ensures <0.001% gain error at G = 100, supporting precision programmable-gain amplifier (PGA) topologies without calibration.
Specified operation from –40°C to +125°C	Validates performance across automotive under-hood, industrial motor control, and outdoor environmental sensor deployments.

Applications

Multi-Channel Sensor Signal Conditioning	Portable Audio Line Drivers
Use Scenario: Simultaneous amplification of four analog outputs from MEMS accelerometers, temperature sensors, and pressure transducers in an IoT edge node. IC Role / Device Role / Timing Role: Quad-channel precision op-amp providing rail-to-rail buffering, anti-alias filtering, and level-shifting prior to 12-bit SAR ADC sampling. Use Value: Single OPA4322AIPW replaces four discrete op-amps, reducing board area by >60% and eliminating inter-channel gain mismatch (≤0.01% typical).	Use Scenario: Driving stereo headphone outputs and line-level signals in battery-powered Bluetooth speakers with single 3.3 V supply. IC Role / Device Role / Timing Role: Dual-output channel (A+B) configured as headphone drivers; remaining channels (C+D) serve as DAC buffers and tone-control filters. Use Value: 0.0005% THD+N at 10 kHz and 4 VPP ensures audiophile-grade playback fidelity without external class-D post-amplification.
Quad Active Filter Banks	Industrial Control-Loop Amplifiers
Use Scenario: Implementing cascaded 4th-order low-pass, high-pass, band-pass, and notch filters in vibration analysis equipment. IC Role / Device Role / Timing Role: Each amplifier configured as unity-gain Sallen-Key stage; shared V+/V− and shutdown enable synchronized filter bank reconfiguration. Use Value: 20 MHz GBP and 10 V/μs slew rate maintain phase coherence across 100 kHz filter bands with <0.5° group delay variation.	Use Scenario: Closed-loop current sensing and PWM feedback amplification in servo motor drives operating at 20 kHz switching frequency. IC Role / Device Role / Timing Role: Channels A and B condition shunt voltage; C and D drive gate drivers and provide isolated error amplification. Use Value: 0.25 µs 0.1% settling time ensures accurate current measurement within one PWM cycle, improving torque ripple suppression.

Multi-Channel Sensor Signal Conditioning

Portable Audio Line Drivers

Use Scenario: Simultaneous amplification of four analog outputs from MEMS accelerometers, temperature sensors, and pressure transducers in an IoT edge node.

IC Role / Device Role / Timing Role: Quad-channel precision op-amp providing rail-to-rail buffering, anti-alias filtering, and level-shifting prior to 12-bit SAR ADC sampling.

Use Value: Single OPA4322AIPW replaces four discrete op-amps, reducing board area by >60% and eliminating inter-channel gain mismatch (≤0.01% typical).

Use Scenario: Driving stereo headphone outputs and line-level signals in battery-powered Bluetooth speakers with single 3.3 V supply.

IC Role / Device Role / Timing Role: Dual-output channel (A+B) configured as headphone drivers; remaining channels (C+D) serve as DAC buffers and tone-control filters.

Use Value: 0.0005% THD+N at 10 kHz and 4 VPP ensures audiophile-grade playback fidelity without external class-D post-amplification.

Quad Active Filter Banks

Industrial Control-Loop Amplifiers

Use Scenario: Implementing cascaded 4th-order low-pass, high-pass, band-pass, and notch filters in vibration analysis equipment.

IC Role / Device Role / Timing Role: Each amplifier configured as unity-gain Sallen-Key stage; shared V+/V− and shutdown enable synchronized filter bank reconfiguration.

Use Value: 20 MHz GBP and 10 V/μs slew rate maintain phase coherence across 100 kHz filter bands with <0.5° group delay variation.

Use Scenario: Closed-loop current sensing and PWM feedback amplification in servo motor drives operating at 20 kHz switching frequency.

IC Role / Device Role / Timing Role: Channels A and B condition shunt voltage; C and D drive gate drivers and provide isolated error amplification.

Use Value: 0.25 µs 0.1% settling time ensures accurate current measurement within one PWM cycle, improving torque ripple suppression.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
OPA4316IPW	Lower 10 MHz GBP, higher 12 nV/√Hz noise, no shutdown, 0.5 mV max VOS	Better DC precision but insufficient bandwidth for >50 kHz active filters or audio line driving	Select when ultra-low offset (<0.5 mV) and low cost outweigh need for shutdown or wideband response.
LMV4342MT/NOPB	12 MHz GBP, 15 nV/√Hz noise, 1.2 mA/ch IQ, no shutdown, SOIC-14 package	Compatible pinout but lacks rail-to-rail input and thermal performance margin for +125°C operation	Choose for legacy SOIC-14 compatibility where extended temperature range and RRI/O are not required.

Compared with OPA4322AIPW, OPA4316IPW trades bandwidth and shutdown for lower offset, while LMV4342MT/NOPB offers cost savings at the expense of noise, speed, and temperature rating - making OPA4322AIPW optimal for new designs demanding balanced AC/DC performance in harsh environments.

Availability

OPA4322AIPW is available at Aetrix Electronics and suitable for multi-channel sensor signal conditioning, portable audio line drivers, quad active filter banks, and industrial control-loop amplifiers requiring stable component supply across automotive, industrial, and medical OEM programs.

Supply support for OPA4322AIPW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision op-amps and signal-chain solutions.

The OPAx322x family was designed specifically for low-power, single-supply applications demanding rail-to-rail I/O, low noise, and high speed - targeting portable instrumentation, consumer audio, and industrial sensing where efficiency and fidelity coexist.

FAQ

What is the maximum operating temperature range for the OPA4322AIPW?

The OPA4322AIPW is fully specified from –40°C to +125°C ambient temperature. All electrical parameters - including offset voltage, gain bandwidth, and quiescent current - are guaranteed across this range, making it suitable for under-hood automotive, industrial motor control, and outdoor environmental monitoring applications where thermal robustness is critical. The 14-pin TSSOP package (PW) maintains thermal resistance (RθJA) of 109.8°C/W under standard JEDEC conditions.

Does the OPA4322AIPW support true rail-to-rail input and output operation?

Yes, the OPA4322AIPW supports true rail-to-rail input (common-mode range extends 0.1 V beyond both V+ and V− rails) and rail-to-rail output (swing within 20 mV of each rail at 10 kΩ load). Its zero-crossover input stage eliminates crossover distortion typically seen in conventional RRI op-amps, preserving signal integrity during rail transitions - a key advantage over legacy rail-to-rail devices in precision DC and audio applications.

How does the shutdown function work on the OPA4322AIPW?

The OPA4322AIPW features dual-group active-low shutdown: SHDN A/B (pin 8) disables channels A and B, while SHDN C/D (pin 9) disables channels C and D. When pulled to V−, each group draws only 0.1 µA per amplifier. Full shutdown (both pins low) reduces total device current to <0.5 µA. Enable time is 10 µs for full shutdown and 6 µs for partial, allowing rapid wake-up in duty-cycled systems without compromising stability.

Can the OPA4322AIPW drive capacitive loads without oscillation?

The OPA4322AIPW is unity-gain stable and characterized to drive ≥50 pF loads without compensation. Typical overshoot remains <5% up to 500 pF at G = 1 (V+ = 5.5 V), and small-signal settling to 0.1% is achieved in 0.25 µs. For loads >500 pF, TI recommends adding a series resistor (10–50 Ω) between output and capacitance to isolate reactive feedback - a practice validated in Figure 16 of the SBOS538F datasheet.

What is the input bias current specification for the OPA4322AIPW at 125°C?

At –40°C to +125°C, the OPA4322AIPW specifies a maximum input bias current of ±400 pA per amplifier. This ultra-low value - enabled by CMOS input architecture - ensures minimal voltage error across high-impedance sources (e.g., >1 MΩ sensor bridges or photodiode transimpedance nodes), even at elevated temperatures where bipolar-input op-amps typically degrade by orders of magnitude.

OPA4322AIPW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: CMOS

Number of Circuits:: 4

Output Type:: Rail-to-Rail

Slew Rate:: 10V/µs

Gain Bandwidth Product:: 20 MHz

-3db Bandwidth:: -

Current - Input Bias:: 0.2 pA

Voltage - Input Offset:: 500 µV

Current - Supply:: 1.6mA (x4 Channels)

Current - Output / Channel:: 65 mA

Voltage - Supply Span (Min):: 1.8 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

OPA4322AIPW FAQ

1.How can I place an order for OPA4322AIPW through Aetrix?

Please submit a Request for Quotation (RFQ) for OPA4322AIPW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for OPA4322AIPW reliable?

The price and inventory of OPA4322AIPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4322AIPW is usually 5 days.

3.What payment methods are accepted for OPA4322AIPW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4322AIPW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for OPA4322AIPW?

OPA4322AIPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your OPA4322AIPW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for OPA4322AIPW?

For technical support, including OPA4322AIPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4322AIPW requirements.

6.How does Aetrix verify that OPA4322AIPW is sourced from the original manufacturer or authorized distributors?

All OPA4322AIPW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA4322AIPW meets industry standards.

7.What is the process for return or replacement of OPA4322AIPW?

All OPA4322AIPW units undergo pre-shipment inspection (PSI). If there is an issue with OPA4322AIPW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The OPA4322AIPW part is unused and in its original packaging.

Return procedure for OPA4322AIPW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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