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Texas Instruments OPA137NA/250
- Part No.:
- OPA137NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA137NA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
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Product details
Overview
OPA137NA/250 from Texas Instruments (formerly Burr-Brown) is a single-channel, FET-input operational amplifier in a 5-lead SOT-23-5 package. It delivers 1 MHz gain-bandwidth, 3.5 V/µs slew rate, ±2.25V to ±18V dual-supply operation (or +4.5V to +36V single supply), 5 pA input bias current, and 1.5 mV max input offset voltage at 25°C - enabling precision signal conditioning in space-constrained, low-power instrumentation.
For engineers reviewing the OPA137NA/250 datasheet, OPA137NA/250 pinout, OPA137NA/250 application, or OPA137NA/250 equivalent, key selection considerations include its rail-to-rail input capability (common-mode range extends to V+), low quiescent current (220 µA/channel), microsize SOT-23-5 footprint, and guaranteed performance over –40°C to +85°C.
Technical Context
The OPA137NA/250 employs a JFET-input stage for ultra-low input bias current and high input impedance (10¹² Ω || 2 pF), supporting high-impedance sensor interfaces without loading. Its unity-gain-stable architecture and 1 MHz bandwidth enable stable operation in transimpedance, integrator, and active filter configurations without external compensation.
Input common-mode voltage extends to the positive supply rail, eliminating need for level-shifting in single-supply photodiode or strain gage amplifiers. The device avoids phase inversion when inputs exceed V+, and features independent internal circuitry ensuring robustness under overload or short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 5 pA typical at 25°C - enables high-impedance source interfacing (e.g., photodiodes, piezoelectric sensors) without significant DC error. |
| Input Offset Voltage | ±1.5 mV max at 25°C - supports precision DC-coupled amplification with <0.01% gain error in 100 mV full-scale systems. |
| Gain-Bandwidth Product | 1 MHz - allows stable closed-loop gain of 100 at 10 kHz or unity gain up to 1 MHz for fast settling in data acquisition front-ends. |
| Slew Rate | 3.5 V/µs - ensures ≤10 µs 0.01% settling for 10 V step outputs, critical for pulse amplification and active filtering. |
| Supply Range | ±2.25V to ±18V dual or +4.5V to +36V single - supports battery-powered (e.g., 3.7 V Li-ion) and industrial (±15 V) rails without redesign. |
| Quiescent Current | 220 µA per channel - enables >1-year operation on coin-cell batteries in portable test equipment and remote sensors. |
| Input Common-Mode Range | Extends to V+ - permits direct high-side current sensing and single-supply photodetector amplification without external bias networks. |
Pinout & Package
OPA137NA/250 is housed in a 5-lead SOT-23-5 surface-mount package (JEDEC MO-178, TI drawing DBV), measuring 2.9 mm × 1.6 mm × 1.1 mm, with exposed pad for thermal enhancement and RoHS-compliant NiPdAu lead finish (MSL Level-2-260°C-1 year).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative power supply | Reference for all internal circuitry; must be connected to ground or negative rail; input common-mode lower limit is (V–) + 3 V. |
| 2 (–In) | Inverting input | Differential input node; high-impedance JFET gate; clamped to V–/V+ for ESD protection; requires current limiting if driven beyond supplies. |
| 3 (Out) | Output | Class AB output stage capable of ±25 mA short-circuit current; drives up to 1000 pF capacitive load without instability. |
| 4 (V+) | Positive power supply | Power rail; input common-mode upper limit reaches V+, enabling rail-to-rail input operation in single-supply configurations. |
| 5 (+In) | Non-inverting input | Differential input node; identical electrical characteristics to –In; used for unity-gain buffers and non-inverting amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5 pA input bias current enables direct connection to high-Z sources like photodiodes (BPW34) and piezoelectric transducers without signal degradation. |
| Rail-to-rail input (to V+) | Common-mode range includes V+, allowing high-side current sensing and single-supply operation without external level-shifting resistors or biasing networks. |
| Unity-gain stability | No external compensation required - simplifies design of transimpedance amplifiers, integrators, and voltage followers across all gains. |
| Low quiescent current | 220 µA per amplifier supports always-on sensor nodes and portable instruments with multi-year battery life on CR2032 cells. |
| No phase inversion | Outputs remain well-behaved even when inputs exceed V+ or fall below V–, preventing latch-up or control-loop instability in feedback circuits. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Wheatstone bridge output from metal foil or semiconductor strain gages in load cells and pressure sensors. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with high input impedance and low offset drift to resolve µV-level differential signals. Use Value: 5 pA input bias current prevents bridge imbalance errors; 1.5 mV offset enables <100 ppm measurement accuracy without trimming. |
Use Scenario: Transimpedance conversion of photocurrent from BPW34 or similar silicon photodiodes in optical encoders and smoke detectors. IC Role / Device Role / Timing Role: Low-noise, unity-gain-stable transimpedance amplifier with input referenced to V+ for high-side biasing. Use Value: Rail-to-rail input allows direct photodiode anode connection to V+, eliminating bias resistor network and reducing dark-current error. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integration of current pulses in energy metering ICs or charge accumulation in scientific instrumentation. IC Role / Device Role / Timing Role: Low-drift integrator core with minimal input bias current to prevent capacitor charging error over time. Use Value: 5 pA IB contributes <1 µC/hour error on 1 µF capacitor - enabling >10-hour integration windows without reset. |
Use Scenario: Signal conditioning front-end in handheld multimeters, portable oscilloscopes, and field-deployed environmental sensors. IC Role / Device Role / Timing Role: General-purpose op amp for amplification, filtering, and level-shifting with minimal power overhead. Use Value: 220 µA IQ allows >2000 hours of operation on a 500 mAh Li-ion cell while maintaining 1 MHz bandwidth for responsive UI updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CDR | Lower supply current (190 µA), but only 850 kHz GBW and higher offset (10 mV max); SO-8 only. | Less suitable for high-speed integrators or wideband filters due to reduced bandwidth and higher offset drift. | Prefer OPA137NA/250 where 1 MHz bandwidth, 1.5 mV offset, or SOT-23-5 size are required. |
| OPA313IDBVR | Higher bandwidth (1.8 MHz), rail-to-rail I/O, but higher IQ (75 µA typical) and larger input capacitance (12 pF). | Better for rail-to-rail output swing needs, but less optimal for ultra-high-Z photodiode inputs due to increased input capacitance. | Choose OPA137NA/250 when lowest input bias current (5 pA vs 10 pA) and proven stability with 1 MΩ feedback resistors are critical. |
Compared with TLC27L2CDR and OPA313IDBVR, the OPA137NA/250 uniquely balances ultra-low input bias current (5 pA), 1 MHz bandwidth, and SOT-23-5 footprint - making it optimal for space-constrained, high-impedance, battery-operated precision analog front-ends where offset and drift must be minimized without sacrificing speed.
Availability
OPA137NA/250 is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, and precision integrators requiring stable component supply across industrial, test & measurement, and portable instrumentation programs.
Supply support for OPA137NA/250 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 acquired Burr-Brown in 2000 and maintains its legacy of precision analog ICs, emphasizing high-performance, low-power, and miniature solutions for industrial and instrumentation markets.
The OPA137NA/250 belongs to TI's MicroAmplifier™ series - designed specifically for cost-sensitive, space-constrained applications demanding FET-input performance, including portable test gear, sensor signal chains, and battery-powered measurement systems.
FAQ
What is the maximum operating temperature range for the OPA137NA/250?
The OPA137NA/250 is specified over –40°C to +85°C for operation and storage, with extended functionality up to +125°C junction temperature. Its thermal resistance (θJA) is 200°C/W in the SOT-23-5 package, requiring minimal heatsinking in ambient temperatures below 70°C at full 220 µA quiescent current.
Does the OPA137NA/250 support single-supply operation?
Yes, the OPA137NA/250 operates from +4.5V to +36V single supply. Its input common-mode range extends to the positive rail (V+), enabling true single-supply configurations - for example, biasing a photodiode anode directly to V+ while using the op amp's non-inverting input as virtual ground.
What is the input protection scheme on the OPA137NA/250?
The OPA137NA/250 features internal ESD diodes clamping both inputs to V+ and V–. If input voltage exceeds V– by more than 500 mV, input current must be limited to ≤2 mA using an external series resistor - otherwise, unpredictable behavior may occur in adjacent channels or output stage.
Can the OPA137NA/250 drive heavy capacitive loads?
Yes - the OPA137NA/250 is characterized to drive up to 1000 pF capacitive loads without oscillation. For loads >100 pF, TI recommends adding a small isolation resistor (e.g., 10–50 Ω) between output and capacitance to maintain phase margin, especially in unity-gain configurations.
How does the OPA137NA/250 compare to the dual OPA2137 in terms of pin compatibility?
The OPA137NA/250 (SOT-23-5) is not pin-compatible with any dual variant. The OPA2137 uses 8-pin packages (SO-8, MSOP-8, DIP), with separate V+, V–, and dual input/output sets. No shared pinout exists - PCB layout must be redesigned when switching between single and dual versions.
OPA137NA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 2.5 mV
- Current - Supply:
- 220µA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA137NA/250 FAQ
1.How can I place an order for OPA137NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137NA/250 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 OPA137NA/250 reliable?
The price and inventory of OPA137NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137NA/250 is usually 5 days.
3.What payment methods are accepted for OPA137NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137NA/250?
OPA137NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137NA/250 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 OPA137NA/250?
For technical support, including OPA137NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137NA/250 requirements.
6.How does Aetrix verify that OPA137NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA137NA/250 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 OPA137NA/250 meets industry standards.
7.What is the process for return or replacement of OPA137NA/250?
All OPA137NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA137NA/250, 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 OPA137NA/250 part is unused and in its original packaging.
Return procedure for OPA137NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA137NA/250 Tags
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