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Texas Instruments OPA4322AIPWR
- Part No.:
- OPA4322AIPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4322AIPWR.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,449
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Product details
Overview
OPA4322AIPWR 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 low distortion and wide dynamic range.
For engineers reviewing the OPA4322AIPWR datasheet, OPA4322AIPWR pinout, OPA4322AIPWR application, or OPA4322AIPWR equivalent, this page provides verified specifications, TSSOP-14 package details, real-world use cases in audio and industrial sensing, and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA4322AIPWR integrates four independent high-speed, low-noise amplifiers sharing a common 1.8–5.5 V supply. Its zero-crossover rail-to-rail input stage eliminates crossover distortion across the full input common-mode range (V– – 0.1 V to V+ + 0.1 V), while unity-gain stability supports direct use in active filters and closed-loop configurations without external compensation.
Each channel features independent shutdown control grouped as SHDN A/B and SHDN C/D (active-low), enabling selective power-down of amplifier pairs. The device achieves 0.0005% THD+N at 10 kHz with 4 VPP output into 10 kΩ, confirming suitability for precision consumer audio and multi-pole filter stages where harmonic integrity is critical.
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 - Supports high-gain sensor amplification (e.g., thermopile, strain gauge) without degrading SNR. |
| Slew Rate | 10 V/μs - Ensures faithful reproduction of fast transients in audio line drivers and control-loop feedback paths. |
| Offset Voltage (max) | 2 mV - Limits DC error to ≤0.2% of full-scale in 1-V output ranges, reducing calibration burden in multi-channel systems. |
| Supply Current per Channel | 1.4–1.65 mA at 5.5 V - Enables four-channel operation under 6.6 mA total, suitable for battery-powered portable instrumentation. |
| Shutdown Current | 0.1 μA per amplifier - Reduces system standby power by >99.9% when channels are disabled via SHDN pins. |
| Common-Mode Input Range | V– – 0.1 V to V+ + 0.1 V - Allows direct interfacing with single-ended ADCs and DACs operating at same rail. |
Pinout & Package
Packaged in a 14-pin TSSOP (PW) with 5.00 mm × 4.40 mm body size and exposed thermal pad on underside (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - Drives loads up to ±65 mA; rail-to-rail swing within 20 mV of rails (25°C). |
| 2 | –IN A | Inverting input, channel A - High-impedance CMOS node (±0.2 pA bias current typical) for precision feedback networks. |
| 3 | +IN A | Noninverting input, channel A - Matches –IN A in offset and bias; enables true differential input configurations. |
| 4 | V+ | Positive supply rail - Accepts 1.8–5.5 V; decoupling capacitor required within 1 cm for stability. |
| 5–7 | OUT B, –IN B, +IN B | Channel B output and inputs - Electrically identical to channel A; isolated layout recommended to minimize crosstalk. |
| 8 | SHDN A/B | Active-low shutdown for channels A and B - Pulling low disables both amplifiers; <3 μs disable time ensures fast power gating. |
| 9 | SHDN C/D | Active-low shutdown for channels C and D - Independent control allows asymmetric power management across four channels. |
| 10–12 | OUT C, –IN C, +IN C | Channel C output and inputs - Pin-compatible with A/B but routed separately; supports independent gain settings. |
| 13 | V– | Negative supply rail - Ground reference for single-supply operation; must be tied to system GND or negative rail. |
| 14 | OUT D | Amplifier D output - Final channel output; shares V– and V+ with other channels; requires local bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 1.8–5.5 V supply range without level-shifting circuitry, simplifying single-supply design. |
| Zero-crossover input stage | Eliminates distortion at signal zero-crossings, critical for low-THD audio and high-fidelity sensor signal chains. |
| Low 8.5 nV/√Hz noise at 1 kHz | Preserves signal integrity in high-gain (>100×) front-end stages where noise dominates system SNR. |
| 20-MHz gain bandwidth | Supports stable operation in 4th-order active filters with cutoff frequencies up to 80 kHz (per TI's third-order filter spec). |
| Independent dual-pair shutdown | Reduces power by >99.9% for unused channels while maintaining bias integrity for fast wake-up (<10 μs enable time). |
Applications
| Multi-Pole Active Filters | Consumer Audio Line Drivers |
|---|---|
Use Scenario: Implementing 4th-order low-pass filtering in portable audio DAC outputs before headphone amplification. IC Role / Device Role / Timing Role: Quad op-amp configured as cascaded 2nd-order Sallen-Key stages, each channel handling one pole pair. Use Value: Achieves >80 dB stopband attenuation at 2× sample rate while maintaining 0.0005% THD+N across 20 Hz–20 kHz band. |
Use Scenario: Driving stereo line-level outputs (2 Vrms) from a single 3.3-V SoC in smart speakers and soundbars. IC Role / Device Role / Timing Role: Dual-channel buffer (A+B) and dual-channel summing amplifier (C+D) for mono/stereo mixing. Use Value: Delivers rail-to-rail swing into 10-kΩ loads with <0.1 mV offset drift over temperature, eliminating DC-blocking capacitors. |
| Sensor Signal Conditioning | Industrial Control-Loop Amplifiers |
Use Scenario: Amplifying low-level outputs (10–100 mV) from four parallel RTD or thermocouple sensors in HVAC controllers. IC Role / Device Role / Timing Role: Four independent instrumentation-grade gain stages (G = 50–100), each with matched input impedance. Use Value: 2 mV max offset and 8.5 nV/√Hz noise ensure ≤0.1°C measurement uncertainty in 0–100°C range with 24-bit ADC. |
Use Scenario: Closed-loop current/voltage regulation in programmable power supplies using four independent feedback paths. IC Role / Device Role / Timing Role: Error amplifiers comparing sensed output against reference, driving PWM modulators with <0.32 μs settling. Use Value: 10 V/μs slew rate and 20 MHz GBW support 500-kHz loop bandwidths, improving transient response to load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4316IPWR | Lower 10 MHz GBW, 11 nV/√Hz noise, 0.5 mV max offset, no shutdown function. | Better DC precision but insufficient bandwidth/noise performance for audio or fast control loops. | Select when ultra-low offset and cost matter more than speed or low-noise AC performance. |
| LMV4316QMF/NOPB | 10 MHz GBW, 12 nV/√Hz noise, 1.5 mV max offset, no shutdown, AEC-Q100 qualified. | Automotive-qualified but lacks rail-to-rail input and has higher noise-unsuitable for precision audio or sensor front-ends. | Choose only for automotive-grade designs where qualification outweighs noise/bandwidth requirements. |
Compared with OPA4322AIPWR, OPA4316IPWR trades 10 MHz less bandwidth and higher noise for lower offset and cost, while LMV4316QMF/NOPB adds automotive qualification at the expense of input range and noise performance-neither offers pin-compatible shutdown or matching AC specs.
Availability
OPA4322AIPWR is available at Aetrix Electronics and suitable for multi-channel sensor signal conditioning, consumer audio line drivers, industrial control-loop amplifiers, and multi-pole active filters requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for OPA4322AIPWR 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 amplifiers and signal chain solutions.
The OPAx322x family was designed specifically for low-power, single-supply applications demanding high AC performance-including sensor interfaces, portable audio, and industrial control systems-where rail-to-rail I/O, low noise, and shutdown capability are essential.
FAQ
What is the maximum operating temperature for the OPA4322AIPWR?
The OPA4322AIPWR is fully specified from –40°C to +125°C ambient temperature, with electrical characteristics guaranteed across this full industrial range. Thermal metrics (RθJA = 109.8°C/W) confirm reliable operation in compact PCB layouts when proper copper pour and thermal vias are used beneath the exposed pad.
Does the OPA4322AIPWR support true rail-to-rail input with common-mode voltage beyond the supply rails?
Yes-the OPA4322AIPWR accepts common-mode input voltages from (V–) – 0.1 V to (V+) + 0.1 V, enabling operation with inputs slightly outside the supply rails. This tolerance accommodates signal overshoot and simplifies interface with external components like multiplexers or level translators without clamping diodes.
How does the shutdown functionality work on the OPA4322AIPWR?
The OPA4322AIPWR uses two active-low shutdown pins: 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 pair draws only 0.1 μA per amplifier. Enable time is 10 μs for full shutdown and 6 μs for partial shutdown, supporting dynamic power management in battery-sensitive systems.
Can the OPA4322AIPWR drive capacitive loads without instability?
Yes-the OPA4322AIPWR is unity-gain stable and can safely drive ≥50 pF loads (per datasheet test conditions). For larger capacitive loads (e.g., >500 pF), TI recommends adding a small series resistor (10–50 Ω) between the output and load to isolate capacitance and maintain phase margin above 47°.
What is the typical input bias current of the OPA4322AIPWR at room temperature?
The typical input bias current of the OPA4322AIPWR is ±0.2 pA at 25°C, with a maximum of ±400 pA over the full –40°C to +125°C temperature range. This ultra-low bias enables high-impedance sensor interfaces (e.g., pH electrodes, photodiodes) without significant voltage error from leakage paths.
OPA4322AIPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA4322AIPWR FAQ
1.How can I place an order for OPA4322AIPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4322AIPWR 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 OPA4322AIPWR reliable?
The price and inventory of OPA4322AIPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4322AIPWR is usually 5 days.
3.What payment methods are accepted for OPA4322AIPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4322AIPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4322AIPWR?
OPA4322AIPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4322AIPWR 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 OPA4322AIPWR?
For technical support, including OPA4322AIPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4322AIPWR requirements.
6.How does Aetrix verify that OPA4322AIPWR is sourced from the original manufacturer or authorized distributors?
All OPA4322AIPWR 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 OPA4322AIPWR meets industry standards.
7.What is the process for return or replacement of OPA4322AIPWR?
All OPA4322AIPWR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4322AIPWR, 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 OPA4322AIPWR part is unused and in its original packaging.
Return procedure for OPA4322AIPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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