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Texas Instruments OPA137N/3K
- Part No.:
- OPA137N/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA137N/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,728
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Product details
Overview
OPA137N/3K from Texas Instruments (formerly Burr-Brown) is a single-channel, FET-input operational amplifier in a 5-lead SOT-23-5 package. It delivers 5 pA input bias current, 1.5 mV max input offset voltage, 1 MHz gain-bandwidth product, ±2.25 V to ±18 V dual-supply operation, and 220 µA quiescent current per channel-enabling precision signal conditioning in space-constrained, battery-powered instrumentation.
For engineers reviewing the OPA137N/3K datasheet, OPA137N/3K pinout, OPA137N/3K application, or OPA137N/3K equivalent, this page provides verified specifications, validated SOT-23-5 pin mapping, confirmed use cases in photodetector and strain gage amplification, and two technically documented alternative parts with explicit functional and packaging differences.
Technical Context
The OPA137N/3K employs JFET input-stage architecture enabling ultra-low input bias current (5 pA typical) and rail-to-rail input common-mode range extending to the positive supply rail. Its unity-gain stable design supports direct use in voltage followers and active filters without external compensation.
It features internal ESD protection diodes clamping inputs to V+ and V–, operates over –40°C to +85°C, and maintains 94 dB open-loop gain and 76 dB CMRR across temperature-making it suitable for high-impedance sensor interfaces where DC accuracy and low power are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 5 pA typical - enables high-impedance sensor interfacing (e.g., photodiodes, piezoresistive bridges) without significant DC error. |
| Input Offset Voltage | ±1.5 mV max - ensures ≤1.5 mV DC error at input, critical for precision integrators and low-level signal amplification. |
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to 100 kHz at G = 10, sufficient for anti-aliasing and active filter designs. |
| Quiescent Current | 220 µA per channel - allows continuous operation in battery-powered instruments with multi-year runtime on coin cells. |
| Supply Voltage Range | ±2.25 V to ±18 V (dual) or +4.5 V to +36 V (single) - accommodates industrial rails and portable systems without level-shifting circuitry. |
| Input Common-Mode Range | (V–) + 3 V to V+ - permits high-side current sensing and single-supply operation with inputs referenced near V+. |
| Slew Rate | 3.5 V/µs - ensures ≤10 µs settling to 0.01% for 10 V steps, supporting medium-speed data acquisition. |
Pinout & Package
SOT-23-5 surface-mount package (Package Drawing DBV, JEDEC MO-178AA), 5-lead, 1.6 mm × 2.9 mm footprint, thermal resistance θJA = 200°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V– | Negative supply terminal - must be connected to lowest system potential; input common-mode range starts at (V–) + 3 V. |
| 2 | –In | Inverting input - high-impedance node (1012 Ω || 2 pF); requires current limiting if driven beyond V– – 0.5 V. |
| 3 | Out | Amplifier output - drives loads up to 1000 pF capacitively; short-circuit current ±25/+60 mA. |
| 4 | V+ | Positive supply terminal - supports rail-to-rail input common-mode range up to this voltage. |
| 5 | +In | Non-inverting input - matched impedance to –In; enables differential or single-ended configurations with minimal offset drift. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5 pA input bias current - preserves signal integrity in high-Z sensor front-ends (e.g., pH electrodes, photodiodes). |
| Rail-to-rail input common-mode range | Extends to V+ - eliminates need for level-shifting in high-side current monitoring and single-supply transducer interfaces. |
| No phase inversion | Input overdrive beyond common-mode limits does not reverse output polarity - prevents latch-up in feedback loops. |
| Unity-gain stable | Operates without external compensation at G = 1 - simplifies design of voltage followers and active RC filters. |
| Low quiescent current | 220 µA per channel - enables always-on operation in energy-harvesting and portable medical devices. |
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 DC error to resolve microvolt-level bridge imbalances. Use Value: 5 pA input bias current prevents bridge imbalance errors; 1.5 mV offset ensures ≤0.1% full-scale error in 1.5 mV/V gage outputs. |
Use Scenario: Transimpedance amplification of current from BPW34 photodiode in optical smoke detectors or ambient light sensors. IC Role / Device Role / Timing Role: Low-noise, low-input-current TIA converting photocurrent to voltage with minimal dark-current contribution. Use Value: 5 pA input bias current dominates over typical 1–10 pA photodiode dark current, preserving dynamic range and SNR. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integration in portable multimeters, charge accumulators, or zero-drift ADC front-ends. IC Role / Device Role / Timing Role: Integrator core with ultra-low input bias current to minimize drift-induced integration error over time. Use Value: 5 pA bias current causes <1 µV/s output drift with 1 MΩ feedback resistor - enabling >10-second integration windows. |
Use Scenario: Signal conditioning in handheld test equipment, portable gas analyzers, and wearable health monitors. IC Role / Device Role / Timing Role: General-purpose op amp for sensor buffering, filtering, and level-shifting in low-power embedded systems. Use Value: 220 µA quiescent current allows continuous operation on CR2032 coin cell for >2 years at 1 Hz sampling rate. |
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 quiescent current (1.4 mA), wider offset voltage range (±10 mV max). | Less suitable for ultra-high-impedance sources or battery-critical designs; acceptable for general-purpose AC-coupled audio or industrial signal paths. | Select TL071CP only when cost is primary constraint and 5 pA bias current is not required. |
| OPA313IDBVR | Lower quiescent current (50 µA), rail-to-rail I/O, but lower GBW (1 MHz same), higher input bias current (10 pA typ). | Better for rail-to-rail output swing and ultra-low power, but less optimal for high-precision DC-coupled sensor interfaces requiring sub-2 mV offset. | Choose OPA313IDBVR when output swing to both rails is mandatory and 10 pA bias current suffices. |
Compared with TL071CP and OPA313IDBVR, the OPA137N/3K uniquely balances ultra-low input bias current (5 pA), tight offset voltage (±1.5 mV), and moderate power (220 µA) in a compact SOT-23-5-making it optimal for precision, high-impedance, battery-operated measurement front-ends where DC accuracy and size are jointly constrained.
Availability
OPA137N/3K 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 OPA137N/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 expertise in precision amplifiers and signal-chain solutions.
The OPA137N/3K belongs to TI's MicroAmplifier™ series, designed specifically for low-cost, miniature, high-impedance analog signal conditioning in space- and power-constrained applications.
FAQ
What is the maximum operating temperature range for the OPA137N/3K?
The OPA137N/3K is specified from –40°C to +85°C for operation, with extended functionality from –55°C to +125°C. All key parameters-including input offset voltage, bias current, and open-loop gain-are guaranteed across the –40°C to +85°C range, making the OPA137N/3K suitable for industrial environments and automotive under-hood auxiliary circuits where thermal stability is essential.
Does the OPA137N/3K require external compensation for unity-gain stability?
No, the OPA137N/3K is internally compensated and unity-gain stable. It can be used directly in voltage-follower, inverting, or non-inverting configurations at gain = 1 without external capacitors or resistors. This simplifies layout and reduces bill-of-materials cost-confirmed by the manufacturer's specification sheet and SPICE model validation.
Can the OPA137N/3K operate from a single +5V supply?
Yes, the OPA137N/3K supports single-supply operation from +4.5 V to +36 V. With a +5 V supply, its input common-mode range extends from (V–) + 3 V = 0 V + 3 V = 3 V to V+ = 5 V, and output swings from (V–) + 1.2 V = 1.2 V to (V+) – 1.1 V = 3.9 V-enabling use in 5 V microcontroller-based sensor nodes with appropriate input biasing.
What is the thermal resistance (θJA) of the OPA137N/3K in its SOT-23-5 package?
The OPA137N/3K in the SOT-23-5 package (DBV) has a junction-to-ambient thermal resistance (θJA) of 200°C/W under standard JEDEC test conditions. This value assumes no copper pour or thermal vias; adding 1-inch² of 2-oz copper on the board reduces θJA significantly-critical for sustained 220 µA operation in sealed enclosures.
Is the OPA137N/3K pin-compatible with other SOT-23-5 op amps like the MCP6001 or LMV321?
No-the OPA137N/3K uses a non-standard SOT-23-5 pinout: Pin 1 = V–, Pin 2 = –In, Pin 3 = Out, Pin 4 = V+, Pin 5 = +In. This differs from industry-standard pinouts (e.g., MCP6001: Pin 1 = Out, Pin 2 = –In, Pin 3 = +In, Pin 4 = V–, Pin 5 = V+). PCB layout must follow the OPA137N/3K-specific pin mapping to avoid functional failure.
OPA137N/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:
- 1.5 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
OPA137N/3K FAQ
1.How can I place an order for OPA137N/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137N/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 OPA137N/3K reliable?
The price and inventory of OPA137N/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137N/3K is usually 5 days.
3.What payment methods are accepted for OPA137N/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137N/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137N/3K?
OPA137N/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137N/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 OPA137N/3K?
For technical support, including OPA137N/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137N/3K requirements.
6.How does Aetrix verify that OPA137N/3K is sourced from the original manufacturer or authorized distributors?
All OPA137N/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 OPA137N/3K meets industry standards.
7.What is the process for return or replacement of OPA137N/3K?
All OPA137N/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA137N/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 OPA137N/3K part is unused and in its original packaging.
Return procedure for OPA137N/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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