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Texas Instruments OPA320SAIDBVT
- Part No.:
- OPA320SAIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA320SAIDBVT.pdf
- Description:
- IC CMOS 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
OPA320SAIDBVT from Texas Instruments is a precision, single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-noise (7 nV/√Hz at 10 kHz), ultra-low input bias current (0.9 pA max), and wide bandwidth (20 MHz) in battery-powered sensor signal conditioning. It operates from 1.8 V to 5.5 V single supply, delivers 10 V/µs slew rate, and features active shutdown with 0.1 µA quiescent current per channel - ideal for high-impedance transimpedance amplifiers in portable test equipment.
For engineers reviewing the OPA320SAIDBVT datasheet, OPA320SAIDBVT pinout, OPA320SAIDBVT application, or OPA320SAIDBVT equivalent, this page provides verified technical context, exact pin functions for the 6-pin SOT-23 package, real-world application mappings, and two validated alternative parts with documented functional and interface differences.
Technical Context
The OPA320SAIDBVT implements a linear CMOS input stage with zero-crossover distortion architecture, enabling 114 dB typical CMRR over full input range and rail-to-rail common-mode operation extending 100 mV beyond both supply rails. Its internal bias circuitry includes a low-noise charge pump to maintain stable input stage performance across voltage and temperature.
It integrates an active shutdown control (SHDN pin, active-low) that reduces quiescent current to 0.1 µA while preserving fast enable/disable timing (tON = 20 µs, tOFF = 3 µs). The device achieves unity-gain stability driving capacitive loads up to 50 pF and maintains 47° phase margin under those conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 20 MHz gain-bandwidth product - supports stable unity-gain operation for ADC driver and active filter applications up to ~10 MHz closed-loop. |
| Input Bias Current | 0.9 pA maximum at 25°C - enables use with >1 GΩ feedback resistors in photodiode transimpedance amplifiers without significant offset drift. |
| Input Voltage Noise | 7 nV/√Hz at 10 kHz - ensures minimal noise contribution when amplifying low-level sensor signals in 1 kHz–100 kHz bandwidths. |
| Supply Range | 1.8 V to 5.5 V single supply - allows direct operation from Li-ion (3.0–4.2 V), coin cell (3 V), or regulated 3.3 V/5 V rails without level-shifting. |
| Shutdown Current | 0.1 µA per amplifier - reduces system standby power by >99% versus active mode (1.45 mA), critical for battery life in portable instrumentation. |
| Output Swing | Within 10 mV of rails (RL = 10 kΩ) - maximizes dynamic range for low-voltage ADC interfacing (e.g., 12-bit SAR with 3.3 V reference). |
| CMRR | 114 dB typical - rejects common-mode interference in high-Z sensor front-ends where ground differentials or EMI coupling occur. |
Pinout & Package
OPA320SAIDBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed pad not connected internally (no thermal pad tie required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT / VOUT | Amplifier output node - drives ADC input, filter network, or next-stage buffer; capable of ±65 mA short-circuit current. |
| 2 | V− | Negative supply terminal - connects to system ground or negative rail; serves as reference for input common-mode and output swing. |
| 3 | +IN | Noninverting input - high-impedance node (4 pF common-mode capacitance) for reference or sensor signal routing. |
| 4 | −IN | Inverting input - matched to +IN for differential pair operation; accepts feedback networks or current-input sensors. |
| 5 | SHDN | Active-low shutdown control - pulled high (>0.7×V+) to enable, driven low (<0.3×V+) to disable amplifier and reduce IQ to 0.1 µA. |
| 6 | V+ | Positive supply terminal - supplies bias and output drive; PSRR of 106 dB ensures immunity to supply ripple in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends 100 mV beyond V− and V+; output swings within 10 mV of rails - preserves full signal headroom on 1.8 V–5.5 V supplies. |
| Zero-crossover distortion | Linear CMOS input stage eliminates crossover glitches at mid-supply - ensures THD+N ≤ 0.0005% at 10 kHz, critical for precision DAC/ADC buffering. |
| Low-noise charge pump | Integrated low-noise bias circuitry stabilizes input stage across temperature - maintains 0.9 pA IB and 7 nV/√Hz en from –40°C to +125°C. |
| Fast shutdown control | 3 µs disable time and 20 µs enable time - enables microsecond-scale power cycling in duty-cycled sensor acquisition systems. |
| Unity-gain stable | Stable with CL ≤ 50 pF and no external compensation - simplifies layout for PCB-constrained space-constrained designs like handheld meters. |
Applications
| High-Z Sensor Signal Conditioning | Transimpedance Amplifiers |
|---|---|
|
Use Scenario: Amplifying weak current signals from photodiodes, pH electrodes, or piezoelectric sensors with source impedances >100 MΩ. IC Role / Device Role / Timing Role: Primary transimpedance gain stage with ultra-low IB and low voltage noise to minimize Johnson-Nyquist and shot noise contributions. Use Value: Enables >12-bit effective resolution in optical gas analyzers using 1 GΩ feedback resistors without IB-induced offset drift. |
Use Scenario: Converting nanoamp-level photocurrent into measurable voltage in portable spectrophotometers and medical pulse oximeters. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with rail-to-rail output swing matching 3.3 V ADC input range. Use Value: Delivers 0.0005% THD+N at 10 kHz, preserving spectral fidelity for FFT-based absorption analysis. |
| Input/Output ADC/DAC Buffers | Programmable Logic Controllers (PLCs) |
|
Use Scenario: Driving SAR ADC inputs (e.g., ADS8860) and buffering DAC outputs (e.g., DAC8560) in data acquisition modules. IC Role / Device Role / Timing Role: Low-output-impedance buffer with 10 V/µs slew rate and 20 MHz bandwidth to settle 16-bit codes within 0.32 µs. Use Value: Eliminates external RC filtering needed with slower op amps, reducing BOM count and board area in modular DAQ cards. |
Use Scenario: Signal conditioning for analog input channels in industrial PLC analog I/O modules operating from 3.3 V or 5 V rails. IC Role / Device Role / Timing Role: High-CMRR (114 dB) front-end amplifier rejecting common-mode noise from 50/60 Hz AC mains coupling in factory environments. Use Value: Maintains <150 µV offset and <5 µV/°C drift across –40°C to +85°C ambient - meets IEC 61000-4-5 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA320AIDBVT | No shutdown pin (5-pin SOT-23); identical specs otherwise - 1.45 mA IQ, same noise, bandwidth, and offset. | Not suitable for power-gated systems; requires external enable circuitry if low-power sleep mode is needed. | Select OPA320AIDBVT only when shutdown functionality is unnecessary and board space permits removal of SHDN trace routing. |
| LMP7721MA/NOPB | Higher input bias current (3 fA typ, 0.2 pA max), lower bandwidth (17 MHz), higher supply current (1.4 mA), no shutdown. | Better for ultra-high-Z DC-coupled sensors (e.g., electrophysiology), but lacks fast enable/disable for burst-mode acquisition. | Choose LMP7721MA/NOPB when sub-pA IB is paramount and shutdown is not required; avoid when >20 MHz bandwidth or microsecond wake-up is needed. |
Compared with OPA320SAIDBVT, OPA320AIDBVT saves one pin and layout area but forfeits independent power control, while LMP7721MA/NOPB offers lower IB at the cost of bandwidth, noise, and no shutdown - making OPA320SAIDBVT optimal for battery-powered, high-speed, low-noise, and power-managed precision signal chains.
Availability
OPA320SAIDBVT is available at Aetrix Electronics and suitable for high-impedance sensor signal conditioning, transimpedance amplifiers, and programmable logic controller (PLC) analog input modules requiring stable component supply and long-term production continuity.
Supply support for OPA320SAIDBVT 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, specializing in analog and embedded processing technologies with broad industrial, automotive, and personal electronics reach.
The OPA320 family was designed specifically for precision, low-power, high-speed signal conditioning in battery-operated and space-constrained systems - targeting ADC/DAC buffering, sensor front-ends, and portable test equipment where rail-to-rail operation, ultra-low IB, and low noise are essential.
FAQ
What is the maximum capacitive load the OPA320SAIDBVT can drive while remaining stable?
The OPA320SAIDBVT is unity-gain stable with capacitive loads up to 50 pF, as confirmed by phase margin testing (47°) in the official datasheet. Driving larger loads requires isolation resistance or external compensation. This capability makes OPA320SAIDBVT suitable for direct connection to ADC input capacitors and compact PCB traces without added stability risk.
Does the OPA320SAIDBVT require external components for shutdown functionality?
No, the OPA320SAIDBVT includes an integrated active-low SHDN pin (Pin 5) that directly controls internal bias circuitry. Pulling SHDN low disables the amplifier and reduces quiescent current to 0.1 µA; no external FETs, resistors, or timing components are needed. This simplifies power sequencing in OPA320SAIDBVT-based designs.
Can the OPA320SAIDBVT operate from a 1.8 V supply while maintaining full rail-to-rail input and output swing?
Yes - the OPA320SAIDBVT guarantees rail-to-rail input common-mode range (extending 100 mV beyond V− and V+) and output swing within 20 mV of both rails at 1.8 V supply (RL = 10 kΩ), as specified in Section 6.7 of the SBOS513F datasheet. This enables full dynamic range utilization in ultra-low-voltage systems.
How does the zero-crossover distortion architecture in the OPA320SAIDBVT improve THD+N performance?
The OPA320SAIDBVT's linear CMOS input stage eliminates crossover nonlinearity inherent in bipolar or JFET input stages, resulting in THD+N of just 0.0005% at 10 kHz (G = 1, VO = 4 VPP). This directly improves harmonic accuracy in audio-grade sensor interfaces and high-fidelity DAC output buffering - a key differentiator versus standard precision op amps.
Is the OPA320SAIDBVT pin-compatible with other members of the OPA320 family?
No - the OPA320SAIDBVT uses a 6-pin SOT-23 (DBV) package with SHDN functionality, whereas the standard OPA320AIDBVT uses a 5-pin SOT-23. Pin 5 on OPA320SAIDBVT is SHDN; that pin position is unused on OPA320AIDBVT. Board redesign is required to substitute OPA320SAIDBVT for non-shutdown variants.
OPA320SAIDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- 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:
- 40 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA320SAIDBVT FAQ
1.How can I place an order for OPA320SAIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA320SAIDBVT 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 OPA320SAIDBVT reliable?
The price and inventory of OPA320SAIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA320SAIDBVT is usually 5 days.
3.What payment methods are accepted for OPA320SAIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA320SAIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA320SAIDBVT?
OPA320SAIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA320SAIDBVT 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 OPA320SAIDBVT?
For technical support, including OPA320SAIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA320SAIDBVT requirements.
6.How does Aetrix verify that OPA320SAIDBVT is sourced from the original manufacturer or authorized distributors?
All OPA320SAIDBVT 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 OPA320SAIDBVT meets industry standards.
7.What is the process for return or replacement of OPA320SAIDBVT?
All OPA320SAIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA320SAIDBVT, 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 OPA320SAIDBVT part is unused and in its original packaging.
Return procedure for OPA320SAIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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