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Texas Instruments OPA137NA/3K
- Part No.:
- OPA137NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA137NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
OPA137NA/3K from Texas Instruments (formerly Burr-Brown) is a single-channel, FET-input operational amplifier in a 5-pin SOT-23-5 package, delivering 5 pA input bias current, 1.5 mV max input offset voltage, 1 MHz gain-bandwidth product, and 220 µA quiescent current per channel. It operates from ±2.25 V to ±18 V dual supplies or +4.5 V to +36 V single supply, and supports high-side sensing due to rail-to-rail input common-mode range extending to V+.
For engineers reviewing the OPA137NA/3K datasheet, OPA137NA/3K pinout, OPA137NA/3K application, or OPA137NA/3K equivalent, key selection criteria include ultra-low input bias current for photodiode amplification, low power consumption for battery-powered instrumentation, input-to-V+ capability for high-side current monitoring, and guaranteed performance over –40°C to +85°C.
Technical Context
The OPA137NA/3K uses a JFET-input stage enabling femtoampere-level input bias current and high input impedance (10¹² Ω || 2 pF), making it suitable for high-impedance sensor interfaces. Its unity-gain stable architecture supports precision integrators and active filters without external compensation.
It features input common-mode voltage range from (V–) + 3 V to V+, eliminating phase reversal when inputs exceed the positive rail - a critical advantage over legacy TL06x op amps in voltage-follower configurations used in control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | ±5 pA typ - enables accurate amplification of nanoamp-level photodiode or strain gage signals without significant DC error |
| Input Offset Voltage | ±1.5 mV max - ensures ≤0.03% gain error in 50 mV full-scale sensor outputs |
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to 100 kHz at G = 10 with <0.1% settling |
| Quiescent Current | 220 µA per channel - allows continuous operation for >1 year on a single CR2032 coin cell in portable test equipment |
| Supply Voltage Range | ±2.25 V to ±18 V dual / +4.5 V to +36 V single - accommodates industrial 24 V rails and low-voltage battery systems |
| Input Common-Mode Range | (V–) + 3 V to V+ - permits direct high-side current sensing without level-shifting circuitry |
| Open-Loop Gain | 94 dB min - provides ≥10,000 V/V loop gain for precision integrator stability and low THD+N (0.05% @ 1 kHz) |
Pinout & Package
OPA137NA/3K is packaged in a RoHS-compliant, green, lead-free SOT-23-5 surface-mount package (TI drawing DBV, JEDEC MO-178AA), with moisture sensitivity level (MSL) 2–260°C/1 year, and thermal resistance θJA = 200°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply rail | Reference for internal biasing; must be ≥3 V below inputs for linear operation |
| 2 (–In) | Inverting input | High-impedance node (10¹² Ω); requires guarding in PCB layout for pA-level signal integrity |
| 3 (Out) | Output | Capable of driving ≥1000 pF directly; output swing limited to (V–)+1.2 V to (V+)–1.1 V |
| 4 (V+) | Positive supply rail | Supports up to +36 V; bypass with ≥10 nF ceramic capacitor near pin |
| 5 (+In) | Non-inverting input | DC-coupled to V+; enables rail-to-rail input operation - critical for high-side sensing topologies |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5 pA input bias current enables photodetector and piezoelectric sensor interfacing without leakage-induced drift |
| Rail-to-rail input common-mode range | Input extends to V+, allowing direct connection to 24 V bus for high-side current monitoring without attenuators |
| No phase inversion | Eliminates output polarity reversal during input overdrive - prevents latch-up in feedback-controlled systems |
| Unity-gain stable | Operates reliably at G = 1 without external compensation, simplifying active filter and integrator designs |
| Low power + wide supply range | 220 µA IQ across ±2.25 V to ±18 V enables use in both energy-constrained and industrial power domains |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Wheatstone bridge output from metallic foil strain gages in load cells or pressure transducers. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with ultra-high input impedance to prevent bridge imbalance errors. Use Value: 5 pA input bias current avoids loading high-resistance bridges (>10 kΩ), preserving millivolt-level differential signals. | Use Scenario: Transimpedance amplification of current from BPW34 photodiode in optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance amplifier converting photocurrent to voltage. Use Value: 1.5 mV offset and 45 nV/√Hz voltage noise ensure sub-100 nA resolution with 1 MΩ feedback resistor. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integration of current pulses in charge measurement circuits for battery coulomb counting or radiation dosimetry. IC Role / Device Role / Timing Role: Unity-gain stable integrator core with low input bias current to minimize integration drift. Use Value: 5 pA bias current contributes <1 µC/hour integration error - enabling >10-hour drift-free accumulation at 1 nA input. | Use Scenario: Signal conditioning in handheld multimeters, portable gas analyzers, or field-deployed environmental sensors. IC Role / Device Role / Timing Role: General-purpose low-power op amp for sensor buffering, filtering, and level-shifting. Use Value: 220 µA quiescent current allows continuous operation on CR2032 (220 mAh) for >10 months at 24-hour duty cycle. |
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 |
|---|---|---|---|
| TL071CP | Higher input bias current (30 pA typ), higher offset (10 mV max), no input-to-V+ capability | Not suitable for high-side sensing or ultra-high-Z sources; lower cost but reduced DC precision | Select only if cost dominates and input bias <10 pA is not required |
| OPA316IDBVR | Lower quiescent current (40 µA), rail-to-rail I/O, but lower GBW (10 MHz) and higher offset (0.75 mV typ) | Better for low-power RRIO systems; less ideal for high-voltage single-supply (>20 V) or high-impedance DC-coupled apps | Prefer when supply <5.5 V and rail-to-rail output swing is mandatory |
Compared with TL071CP and OPA316IDBVR, the OPA137NA/3K uniquely balances ultra-low input bias current, input common-mode range to V+, and robust 1 MHz bandwidth across ±18 V supplies - making it optimal for high-precision, high-voltage, high-impedance analog front-ends where leakage and headroom are critical.
Availability
OPA137NA/3K is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, and precision integrators requiring stable component supply, long-term manufacturability, and guaranteed –40°C to +85°C operation.
Supply support for OPA137NA/3K 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 (TI) is a global semiconductor leader specializing in analog and embedded processing technologies, with deep heritage in precision op amps dating to Burr-Brown acquisition in 2000.
The OPA137NA/3K belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-cost, low-power precision analog signal conditioning in space-constrained and battery-sensitive applications.
FAQ
What is the maximum operating supply voltage for OPA137NA/3K?
The OPA137NA/3K supports dual supplies from ±2.25 V to ±18 V and single supplies from +4.5 V to +36 V. Absolute maximum ratings specify V+ to V– ≤ 36 V, with input voltage range limited to (V–) – 0.7 V to (V+) + 0.7 V. Exceeding these limits risks permanent damage. The OPA137NA/3K maintains specified performance across its full operating range, including 220 µA quiescent current and 1 MHz GBW at ±15 V and +30 V conditions.
Does OPA137NA/3K support rail-to-rail input operation?
Yes - the OPA137NA/3K features an input common-mode voltage range extending from (V–) + 3 V to V+, enabling true input operation up to the positive supply rail. This "input-to-V+" capability is essential for high-side current sensing and single-supply applications where the signal references V+. Unlike many FET-input op amps (e.g., TL071), the OPA137NA/3K does not exhibit phase reversal when inputs exceed V+, ensuring reliable behavior in voltage-follower configurations. The OPA137NA/3K achieves this via proprietary input stage design documented in the Burr-Brown PDS-1438A datasheet.
What is the input bias current specification for OPA137NA/3K at room temperature?
The OPA137NA/3K has a typical input bias current of ±5 pA at +25°C, with a maximum of ±100 pA over the full –40°C to +85°C temperature range. This ultra-low value results from its JFET-input architecture and enables accurate amplification of nanoamp-level currents from photodiodes, pH electrodes, or high-value resistive sensors. Input bias current increases with temperature and varies with common-mode voltage - both dependencies are characterized in the OPA137NA/3K datasheet's typical performance curves. For precision DC applications, the OPA137NA/3K's 5 pA typ remains among the lowest in its class.
Can OPA137NA/3K drive capacitive loads without instability?
Yes - the OPA137NA/3K is specified to drive up to 1000 pF capacitive loads while maintaining stability, as confirmed by its unity-gain stable design and characterization in the datasheet's large-signal step response and overshoot vs. load capacitance plots. For loads >100 pF, TI recommends adding a small series resistor (e.g., 10–50 Ω) between the output and capacitive node to isolate the amplifier's output impedance from the reactive load. This technique preserves phase margin without degrading bandwidth significantly. The OPA137NA/3K's ability to drive 1000 pF directly simplifies active filter and ADC driver designs where output filtering is required.
What package type and marking does OPA137NA/3K use?
The OPA137NA/3K is supplied in a 5-pin SOT-23-5 package (TI drawing DBV, JEDEC MO-178AA), with device marking "E37" laser-etched on the top surface. It ships in tape-and-reel format with 3000 units per reel (denoted by the "/3K" suffix). The package is RoHS-compliant, green (low-halogen), and lead-free with NiPdAu terminal finish. Moisture sensitivity level is MSL-2 (260°C peak reflow, 1-year floor life). The OPA137NA/3K's compact 2.9 mm × 1.6 mm footprint supports high-density PCB layouts in portable and modular instrumentation.
OPA137NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/3K FAQ
1.How can I place an order for OPA137NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137NA/3K 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/3K reliable?
The price and inventory of OPA137NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137NA/3K is usually 5 days.
3.What payment methods are accepted for OPA137NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137NA/3K?
OPA137NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137NA/3K 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/3K?
For technical support, including OPA137NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137NA/3K requirements.
6.How does Aetrix verify that OPA137NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA137NA/3K 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/3K meets industry standards.
7.What is the process for return or replacement of OPA137NA/3K?
All OPA137NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA137NA/3K, 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/3K part is unused and in its original packaging.
Return procedure for OPA137NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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