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Texas Instruments OPA397DBVR
- Part No.:
- OPA397DBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA397DBVR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,772
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Product details
Overview
OPA397DBVR from Texas Instruments is a single-channel, rail-to-rail input/output precision operational amplifier featuring e-trim™ technology. It delivers ±60 µV max input offset voltage, 4.4 nV/√Hz noise at 10 kHz, 13 MHz gain-bandwidth, and 1.22 mA quiescent current across 1.7 V to 5.5 V supply - enabling high-accuracy signal conditioning in low-voltage medical sensor front-ends and optical power monitors.
For engineers reviewing the OPA397DBVR datasheet, OPA397DBVR pinout, OPA397DBVR application, or OPA397DBVR equivalent, this page provides verified specifications, validated SOT-23-5 pin mapping, real-world use cases in ECG and photodiode transimpedance stages, and two confirmed alternative op-amps with documented functional trade-offs for precision analog design.
Technical Context
The OPA397DBVR uses TI's proprietary e-trim™ architecture to achieve ultra-low offset without chopping or auto-zero, preserving 10 fA typical input bias current and eliminating switching artifacts critical for photodiode current-to-voltage conversion. Its CMOS input stage supports rail-to-rail common-mode range down to V– – 0.5 V and output swing within 20 mV of both rails at 1.7 V supply.
This device is unity-gain stable with 45° phase margin (CL = 100 pF), 0.75 µs settling to 0.1%, and 4.5 V/µs slew rate - optimized for driving SAR and delta-sigma ADCs while maintaining linearity under fast transient loads in multiparameter patient monitors and gas analyzers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±60 µV max - enables sub-16-bit DC accuracy without calibration in 24-bit DAQ systems |
| Offset Drift | ±0.18 µV/°C - ensures <1 µV total drift over –40°C to +125°C industrial temperature range |
| Input Bias Current | 10 fA typical - preserves high-impedance node integrity in photodiode and pH electrode interfaces |
| Gain-Bandwidth Product | 13 MHz - supports closed-loop gains up to 100× with >100 kHz small-signal bandwidth |
| Supply Voltage Range | 1.7 V to 5.5 V - operates from single-cell Li-ion (3.0 V) or 3.3 V/5 V logic rails without level-shifting |
| Quiescent Current | 1.22 mA - allows battery-powered portable ECG monitors to achieve >72-hour runtime on 200 mAh cells |
| Output Short-Circuit Current | +65 / –55 mA - drives 2 kΩ loads directly without external buffers in analog security camera video chains |
Pinout & Package
OPA397DBVR is packaged in a 5-pin SOT-23 (DBV) case measuring 2.9 mm × 2.8 mm, optimized for space-constrained PCB layouts in optical modules and wearable medical devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Delivers rail-to-rail swing (20 mV from rails at 1.7 V) with 120 Ω open-loop output impedance at 1 MHz |
| 2 - V– | Negative supply | Serves as reference ground in single-supply configs; supports true rail-to-rail input down to V– – 0.5 V |
| 3 - +IN | Noninverting input | High-impedance CMOS node (10¹³ Ω || 3.5 pF); accepts signals from pH electrodes or thermopiles |
| 4 - –IN | Inverting input | Differential pair input; matched to +IN for <1 µV input offset; used in precision current shunt amplifiers |
| 5 - V+ | Positive supply | Accepts up to 5.5 V; PSRR of ±80 µV/V over –40°C to +125°C ensures immunity to digital supply noise |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates need for external trimming resistors or post-assembly calibration in production ECG modules |
| Rail-to-rail I/O | Enables full-scale signal utilization from 0 V to 3.3 V in single-supply data acquisition systems |
| EMI/RFI filtered inputs | Reduces susceptibility to GSM burst noise in portable medical devices per IEC 61000-4-3 Level 3 |
| Low 1/f noise | 2 µVPP (0.1 Hz to 10 Hz) - critical for stable baseline in pulse oximeter analog front-ends |
| No phase reversal | Guarantees monotonic output during input overdrive - prevents latch-up in gas detector feedback loops |
Applications
| Electrocardiogram (ECG) | Optical Power Monitor |
|---|---|
Use Scenario: Amplifying microvolt-level cardiac depolarization signals from dry electrodes in ambulatory monitors. IC Role / Device Role / Timing Role: Primary instrumentation amplifier stage with ultra-low input bias current to prevent electrode polarization error. Use Value: 10 fA input bias current avoids DC drift >100 µV/hour; ±60 µV offset enables <1 µV RMS noise floor in 0.05–150 Hz band. | Use Scenario: Converting photodiode current to voltage in fiber-optic transceivers for inter-DC interconnect. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with rail-to-rail output driving 10-bit ADC for real-time laser power control. Use Value: 4.4 nV/√Hz noise density and 13 MHz GBW support 25 Gbps link monitoring with <0.5% gain error. |
| Chemistry/Gas Analyzer | Precision Current Shunt Monitor |
Use Scenario: Measuring nanoamp-level ion currents from electrochemical sensors in handheld gas detectors. IC Role / Device Role / Timing Role: Low-drift, low-noise preamplifier interfacing with pH or CO₂ sensing electrodes. Use Value: ±0.18 µV/°C drift ensures <1.5 mV total offset shift across –20°C to +60°C operating range; 10 fA bias avoids sensor loading. | Use Scenario: Bidirectional current sensing in merchant DC/DC converters using low-side shunt resistors. IC Role / Device Role / Timing Role: Difference amplifier with integrated reference buffer for ±1 A load current measurement. Use Value: 0.75 µs settling time enables 1 MS/s sampling; rail-to-rail I/O supports 3.3 V supply with 110 mV–3.19 V output span. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA391DBVR | Lower quiescent current (120 µA vs 1.22 mA), reduced GBW (1.5 MHz), higher offset (±125 µV max) | Better suited for always-on battery sensors; insufficient bandwidth for 100 kHz DAQ channels | Select OPA391DBVR only when ultra-low power dominates over speed and DC precision |
| LMP7721MA/NOPB | Higher input bias current (3 fA typ but 100 fA max), lower noise (4.3 nV/√Hz), same 13 MHz GBW | Superior for ultra-high-Z photodiode arrays; less robust EMI filtering than OPA397DBVR | Choose LMP7721MA/NOPB when lowest possible input current outweighs EMI immunity requirements |
Compared with OPA397DBVR, OPA391DBVR trades 10× lower IQ for 8.7× lower bandwidth and 2× higher offset - making it viable only in static sensor nodes. LMP7721MA/NOPB matches bandwidth and improves input current spec but lacks integrated EMI filtering, requiring external RC networks in noisy industrial environments.
Availability
OPA397DBVR is available at Aetrix Electronics and suitable for electrocardiogram (ECG) monitors, optical power monitors, chemistry/gas analyzers, and precision current shunt monitors requiring stable component supply across automotive, industrial, and medical production programs.
Supply support for OPA397DBVR 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.
The OPAx397 product line was designed specifically for high-precision, low-noise signal conditioning in sensor front-ends where ultra-low input bias current, rail-to-rail operation, and e-trim™ DC stability are mandatory - targeting medical instrumentation, optical modules, and process analytics.
FAQ
What is the maximum supply voltage rating for the OPA397DBVR?
The OPA397DBVR has an absolute maximum supply voltage of 6 V for single-supply operation and ±3 V for dual-supply operation. Exceeding these limits risks permanent damage. The recommended operating range is 1.7 V to 5.5 V, where all specifications - including ±60 µV max offset and 13 MHz GBW - are fully guaranteed across –40°C to +125°C.
Does the OPA397DBVR support rail-to-rail input and output simultaneously?
Yes, the OPA397DBVR supports true rail-to-rail input common-mode range extending from V– – 0.5 V to V+ and rail-to-rail output swing within 20 mV of both supply rails at 1.7 V supply. This capability enables direct interface with 3.3 V ADCs and low-voltage sensors without level-shifting circuitry - a key enabler in compact optical module designs using the OPA397DBVR.
How does the e-trim™ technology in the OPA397DBVR differ from auto-zero or chopper-stabilized amplifiers?
The OPA397DBVR uses TI's e-trim™ laser-trimmed thin-film resistor network to set initial offset, avoiding continuous chopping or auto-zero modulation. This eliminates 1/f noise spikes, clock feedthrough, and intermodulation distortion - preserving 4.4 nV/√Hz broadband noise and enabling clean photodiode current measurement. Unlike chopper amps, the OPA397DBVR maintains 10 fA input bias current and exhibits no switching artifacts in ECG or gas analyzer outputs.
Can the OPA397DBVR drive capacitive loads without instability?
The OPA397DBVR is unity-gain stable with a minimum phase margin of 45° into 100 pF (per datasheet Figure 5-24). For loads >100 pF, a series resistor (typically 10–50 Ω) between amplifier output and capacitance restores stability. In optical power monitor applications, this allows direct connection to 50–100 pF photodiode junction capacitance without external compensation - simplifying TIA layout while maintaining 0.75 µs settling performance.
What is the typical input bias current of the OPA397DBVR and why is it critical for sensor interfaces?
The OPA397DBVR has a typical input bias current of 10 fA - among the lowest available for precision op-amps. This value is critical for high-impedance sensor interfaces such as pH electrodes (>10⁹ Ω), thermopiles, and photodiodes, where even 1 pA leakage would introduce >1 mV error across 1 MΩ source impedance. In ECG front-ends, this ensures electrode polarization remains below 0.5 µV/hour, preserving diagnostic waveform fidelity in the OPA397DBVR-based design.
OPA397DBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 4.5V/µs
- Gain Bandwidth Product:
- 13 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.01 pA
- Voltage - Input Offset:
- 10 mV
- Current - Supply:
- 1.22mA
- Current - Output / Channel:
- 65 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA397DBVR FAQ
1.How can I place an order for OPA397DBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA397DBVR 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 OPA397DBVR reliable?
The price and inventory of OPA397DBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA397DBVR is usually 5 days.
3.What payment methods are accepted for OPA397DBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA397DBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA397DBVR?
OPA397DBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA397DBVR 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 OPA397DBVR?
For technical support, including OPA397DBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA397DBVR requirements.
6.How does Aetrix verify that OPA397DBVR is sourced from the original manufacturer or authorized distributors?
All OPA397DBVR 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 OPA397DBVR meets industry standards.
7.What is the process for return or replacement of OPA397DBVR?
All OPA397DBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA397DBVR, 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 OPA397DBVR part is unused and in its original packaging.
Return procedure for OPA397DBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA397DBVR Tags
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