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Texas Instruments OPA322SAIDBVT
- Part No.:
- OPA322SAIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA322SAIDBVT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:529
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Product details
Overview
OPA322SAIDBVT from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-noise, low-power, single-supply signal conditioning. It delivers 20 MHz gain bandwidth, 8.5 nV/√Hz input voltage noise at 1 kHz, and 10 V/μs slew rate, operating from 1.8 V to 5.5 V supply. It is used in precision sensor front-ends and battery-powered audio preamplifiers.
For engineers reviewing the OPA322SAIDBVT datasheet, OPA322SAIDBVT pinout, OPA322SAIDBVT application, or OPA322SAIDBVT equivalent, key selection criteria include shutdown current (0.1 μA), offset voltage (≤2 mV), rail-to-rail I/O swing, and thermal performance in SOT-23-6 packaging for space-constrained designs.
Technical Context
The OPA322SAIDBVT 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 CMOS input architecture achieves ultra-low input bias current (±0.2 pA typ) and high common-mode rejection (90–100 dB).
It features active shutdown with 3 μs disable time and 6–10 μs enable time, supporting dynamic power management in portable systems. The device is unity-gain stable and drives capacitive loads up to 50 pF without oscillation, verified across –40°C to +125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 20 MHz - supports stable closed-loop gain ≥10 at 2 MHz, suitable for multi-pole active filters and fast control loops. |
| Input Voltage Noise | 8.5 nV/√Hz at 1 kHz - enables high-gain sensor signal conditioning without degrading SNR in sub-mV-level outputs. |
| Slew Rate | 10 V/μs - ensures faithful reproduction of 1-Vpp signals up to ~1.6 MHz without slew-induced distortion. |
| Supply Current per Channel | 1.5–1.9 mA - balances speed and power for always-on analog front-ends in IoT edge nodes. |
| Shutdown Quiescent Current | 0.1 μA - reduces system standby power by >99.9% versus active mode, critical for coin-cell lifetime extension. |
| Input Offset Voltage | ≤2 mV max - allows direct DC-coupled interfacing to thermocouples or bridge sensors without external trimming. |
| Rail-to-Rail I/O | Swings within 20 mV of both rails at 10-kΩ load - maximizes dynamic range in 1.8-V single-supply systems. |
Pinout & Package
OPA322SAIDBVT is packaged in a 6-pin SOT-23 (DBV) with 2.90 mm × 1.60 mm body size and exposed thermal pad on underside (not electrically connected). Thermal resistance RθJA = 177.5°C/W enables operation at full spec up to +125°C ambient with minimal PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply | Accepts 1.8 V to 5.5 V; must be decoupled with ≥100 nF ceramic capacitor near pin. |
| V− | Negative power supply | Typically ground in single-supply systems; serves as reference for input common-mode and output swing. |
| +IN | Noninverting input | CMOS input with ±0.2 pA bias current; supports common-mode range from V− − 0.1 V to V+ + 0.1 V. |
| −IN | Inverting input | Matches +IN characteristics; differential input capacitance is 5 pF, critical for high-frequency stability. |
| OUT | Amplifier output | Capable of sourcing/sinking ±65 mA; maintains rail-to-rail swing into 10-kΩ load at 25°C. |
| SHDN | Active-low shutdown control | Pulled high (≥V+ − 0.1 V) for normal operation; driven low (≤V− + 0.1 V) to enter 0.1-μA shutdown state. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-crossover RRI/O architecture | Eliminates crossover distortion in Class-AB output stage, preserving THD+N ≤ 0.0005% at 10 kHz with 4-Vpp output. |
| Low 1/f noise corner | 0.1 Hz to 10 Hz integrated noise = 2.8 μVPP, enabling stable DC-coupled amplification of slow-varying sensor signals. |
| High PSRR | ≥50 μV/V (100 dB) over 1.8–5.5 V supply range - rejects supply ripple without requiring ultra-low-noise LDOs. |
| Unity-gain stability | Guaranteed stable with 50-pF capacitive load and no external compensation - simplifies layout in space-constrained PCBs. |
| Extended temperature range | Specified from –40°C to +125°C - qualified for automotive cabin, industrial motor control, and outdoor sensor applications. |
Applications
| Medical Pulse Oximetry Front-End | Portable Audio Line Driver |
|---|---|
Use Scenario: Amplifying weak, low-frequency photodiode current signals (nA level) in battery-powered pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier and DC-coupled gain stage with rail-to-rail output driving ADC reference. Use Value: 8.5 nV/√Hz noise and 2 mV max offset preserve signal integrity across 0.5–5 Hz SpO₂ waveform, extending battery life via 0.1-μA shutdown between measurements. |
Use Scenario: Driving 10-kΩ line inputs in Bluetooth headphones and USB-C DAC dongles powered from 3.3-V LDOs. IC Role / Device Role / Timing Role: Low-distortion, unity-gain buffer with shutdown control synchronized to audio playback state. Use Value: 0.0005% THD+N at 10 kHz and rail-to-rail swing deliver full 3.3-Vpp dynamic range; 6-μs enable time avoids pop/click during resume. |
| Industrial 4–20 mA Loop Receiver | Multi-Pole Anti-Aliasing Filter |
Use Scenario: Converting 4–20 mA loop current to 0.5–2.5 V for SAR ADC sampling in programmable logic controllers. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with gain-setting resistor and output buffer. Use Value: ≤2 mV offset and 90–100 dB CMRR reject common-mode noise on long field wiring; 1.5 mA quiescent current fits tight power budgets. |
Use Scenario: Implementing 4th-order Butterworth filter before 1-MSPS ADC in data acquisition modules. IC Role / Device Role / Timing Role: High-speed, low-noise op-amp in dual-stage Sallen-Key topology with precise pole placement. Use Value: 20-MHz GBW and 10-V/μs slew rate support filter cutoffs up to 200 kHz without phase error; unity-gain stability avoids external compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA320SAIDBVT | Lower input voltage noise (7 nV/√Hz), but lower GBW (20 MHz same), higher IQ (1.7 mA), no shutdown. | Lacks active shutdown; unsuitable where intermittent operation is required to meet battery lifetime targets. | Select when lowest possible noise dominates over power gating capability and shutdown timing is irrelevant. |
| MCP6001T-E/OT | Lower GBW (1 MHz), higher offset (4.5 mV max), no shutdown, wider supply range (1.8–6.0 V). | Insufficient bandwidth and noise performance for audio or fast sensor conditioning; suited only for low-speed monitoring. | Choose only for cost-sensitive, non-critical DC applications where 20-MHz bandwidth and 8.5-nV/√Hz noise are unnecessary. |
Compared with OPA322SAIDBVT, OPA320SAIDBVT trades shutdown functionality for marginally better noise, while MCP6001T-E/OT sacrifices bandwidth and precision for cost and supply flexibility-making OPA322SAIDBVT the optimal balance for power-aware, high-fidelity analog signal chains.
Availability
OPA322SAIDBVT is available at Aetrix Electronics and suitable for medical wearables, portable audio devices, and industrial sensor transmitters requiring stable component supply with guaranteed long-term availability and traceable lot documentation.
Supply support for OPA322SAIDBVT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The OPAx322x family was designed specifically for low-noise, low-power, rail-to-rail signal conditioning in single-supply systems-from portable instrumentation to battery-operated IoT endpoints-emphasizing precision, speed, and energy efficiency without external support components.
FAQ
What is the maximum capacitive load the OPA322SAIDBVT can drive while remaining stable?
The OPA322SAIDBVT is unity-gain stable and characterized to drive up to 50 pF without external compensation, as confirmed in the datasheet's Typical Characteristics (Figure 16). For loads exceeding 50 pF, a small series resistor (10–50 Ω) at the output is recommended to maintain phase margin above 47° and prevent peaking or oscillation in the OPA322SAIDBVT closed-loop response.
Does the OPA322SAIDBVT require external passive components for basic operation?
No, the OPA322SAIDBVT operates fully functional with only two external bypass capacitors: one 100-nF ceramic capacitor between V+ and V− near the package, and optionally a 1-μF bulk capacitor for systems with noisy supplies. No compensation networks, offset nulling resistors, or feedback components are needed for unity-gain buffer or inverting amplifier configurations per the OPA322SAIDBVT datasheet recommendations.
How does the shutdown feature of the OPA322SAIDBVT affect system-level power sequencing?
The OPA322SAIDBVT shutdown pin (SHDN) is active-low with VIH ≥ V+ − 0.1 V and VIL ≤ V− + 0.1 V, allowing direct interface to GPIOs or power supervisors without level-shifting. Its 3-μs disable time and 6–10-μs enable time ensure rapid transitions, making it compatible with microcontroller-driven power gating schemes in the OPA322SAIDBVT-based design without introducing audible artifacts or measurement gaps.
Can the OPA322SAIDBVT operate from a 1.8-V supply while maintaining full AC performance specifications?
Yes-the OPA322SAIDBVT is fully specified from 1.8 V to 5.5 V, including 20-MHz GBW, 10-V/μs slew rate, and 8.5-nV/√Hz noise at 1.8 V. Electrical Characteristics tables confirm these parameters hold across the entire supply range at TA = 25°C, and the device maintains rail-to-rail output swing within 30 mV of both rails from –40°C to +125°C, validating its use in ultra-low-voltage OPA322SAIDBVT deployments.
What is the thermal performance limitation of the OPA322SAIDBVT in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1-in² 1-oz copper pour under the OPA322SAIDBVT SOT-23-6 package, the junction-to-board thermal resistance (ψJB) is 26.9°C/W. At 1.9 mA quiescent current and 5.5-V supply, power dissipation is ~10.4 mW; resulting in <0.3°C junction rise above board temperature-well within the OPA322SAIDBVT's –40°C to +125°C operating range without heatsinking or airflow.
OPA322SAIDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- SOT-23-6
OPA322SAIDBVT FAQ
1.How can I place an order for OPA322SAIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA322SAIDBVT 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 OPA322SAIDBVT reliable?
The price and inventory of OPA322SAIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA322SAIDBVT is usually 5 days.
3.What payment methods are accepted for OPA322SAIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA322SAIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA322SAIDBVT?
OPA322SAIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA322SAIDBVT 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 OPA322SAIDBVT?
For technical support, including OPA322SAIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA322SAIDBVT requirements.
6.How does Aetrix verify that OPA322SAIDBVT is sourced from the original manufacturer or authorized distributors?
All OPA322SAIDBVT 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 OPA322SAIDBVT meets industry standards.
7.What is the process for return or replacement of OPA322SAIDBVT?
All OPA322SAIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA322SAIDBVT, 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 OPA322SAIDBVT part is unused and in its original packaging.
Return procedure for OPA322SAIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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