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Texas Instruments OPA137PA
- Part No.:
- OPA137PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA137PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,794
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Product details
Overview
OPA137PA from Texas Instruments (formerly Burr-Brown) is a single-channel FET-input operational amplifier in an 8-pin DIP package, delivering 5 pA input bias current, 1.5 mV max offset voltage, 1 MHz gain-bandwidth product, and 3.5 V/µs slew rate. It operates from ±2.25 V to ±18 V dual supplies or +4.5 V to +36 V single supply, and is widely used in precision photodetector amplifiers and battery-powered instrumentation.
For engineers reviewing the OPA137PA datasheet, OPA137PA pinout, OPA137PA application, or OPA137PA equivalent, key selection criteria include its rail-to-rail input capability (common-mode range extends to V+), low quiescent current (220 µA/channel), wide temperature range (–40°C to +85°C), and compatibility with high-impedance sensor interfaces requiring minimal loading.
Technical Context
The OPA137PA uses a JFET-input stage enabling ultra-low input bias current (5 pA typical) and high input impedance (10¹² Ω || 2 pF), making it suitable for high-source-impedance applications like photodiode and strain gage amplification. Its input common-mode voltage range extends to the positive supply rail, eliminating need for level-shifting in single-supply configurations.
It features unity-gain stability, no phase inversion under overdrive, and independent internal circuitry ensuring robust operation even when inputs exceed common-mode limits. The device maintains linearity and low distortion (0.05% THD+N at 1 kHz) across its full output swing (V– +1.2 V to V+ –1.1 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 5 pA typical - enables accurate amplification of nanoamp-level sensor currents without significant error. |
| Input Offset Voltage | ±1.5 mV max - ensures DC accuracy in precision integrators and low-level signal conditioning. |
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop operation up to ~100 kHz at G = 10, suitable for active filters and anti-aliasing stages. |
| Slew Rate | 3.5 V/µs - allows clean 10 V step response within 8 µs (0.1% settling), critical for fast pulse amplification. |
| Supply Voltage Range | ±2.25 V to ±18 V dual or +4.5 V to +36 V single - accommodates industrial rails and extended-battery systems. |
| Quiescent Current | 220 µA per channel - enables multi-year operation in coin-cell–powered portable test equipment. |
| Common-Mode Input Range | Extends to V+ - permits direct sensing of signals referenced to positive supply (e.g., high-side current monitoring). |
Pinout & Package
OPA137PA is housed in an 8-pin plastic dual in-line package (PDIP), with standard through-hole mounting and 0.3-inch body width. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V– | Negative power supply terminal - must be connected to lowest system potential; supports rail-to-rail input common-mode down to V– +3 V. |
| 2 | –In | Inverting input - high-impedance node (10¹² Ω); sensitive to PCB leakage and ESD; requires guarding in high-Z layouts. |
| 3 | +In | Non-inverting input - identical impedance to Pin 2; common-mode range includes V+, enabling single-supply operation. |
| 4 | V+ | Positive power supply terminal - bypass with ≥10 nF ceramic capacitor near package for stability and noise rejection. |
| 5 | Out | Amplifier output - drives loads up to 1000 pF directly; short-circuit current limited to –25/+60 mA. |
| 6–8 | NC | No-connect - internally unconnected; must remain floating (not tied to ground or supply). |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5 pA input bias current enables use with >1 MΩ source impedances without measurable DC error. |
| Rail-to-rail input (to V+) | Eliminates external level-shifting circuitry in single-supply sensor front-ends, reducing component count and board space. |
| Unity-gain stable | Operates reliably at gain = 1 without compensation components, simplifying design of voltage followers and buffers. |
| No phase inversion | Prevents catastrophic output reversal during input overdrive - essential for closed-loop control and safety-critical monitoring. |
| Wide temperature range | Specified from –40°C to +85°C, with operation guaranteed to –55°C and +125°C, supporting industrial and automotive under-hood environments. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Amplifying low-level Wheatstone bridge outputs (typically <10 mV full scale) from metal foil or semiconductor strain gages in load cells and pressure transducers. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end, configured as non-inverting or differential gain stage. Use Value: Ultra-low input bias current prevents bridge imbalance errors; low offset voltage (<1.5 mV) preserves measurement resolution at sub-0.1% FS accuracy. | Use Scenario: Converting nanoamp-level photocurrent from BPW34 or similar silicon photodiodes into usable voltage signals in optical encoders and spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with feedback resistor up to 1 MΩ and optional 3.3 pF compensation. Use Value: 5 pA input bias current avoids signal loss in high-Rf configurations; 1 MHz GBW supports bandwidths >100 kHz for fast light-pulse detection. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Building analog integrators for charge accumulation, waveform generation, or analog computing in lab-grade signal generators and energy meters. IC Role / Device Role / Timing Role: Core op-amp in Miller integrator topology with polypropylene or C0G capacitors and ultra-low-leakage feedback paths. Use Value: Low input bias current minimizes integration drift; 94 dB open-loop gain ensures <0.01% linearity over 1-second integration windows. | Use Scenario: Signal conditioning in handheld multimeters, portable gas analyzers, and field-deployable environmental sensors powered by AA/AAA or coin cells. IC Role / Device Role / Timing Role: Low-power analog front-end for sensor excitation, amplification, and ADC driver stages. Use Value: 220 µA quiescent current extends battery life beyond 5 years in sleep-wake duty cycles; wide supply range tolerates aging battery voltage drop. |
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 voltage (10 mV max), same 8-pin DIP package. | Less suitable for high-impedance photodiode or piezoelectric sensor interfaces due to increased input error. | Select TL071CP only when cost is primary constraint and 5 pA bias current is not required. |
| OPA344PA | Lower quiescent current (80 µA), rail-to-rail output (OPA137PA is not RRO), same 8-pin DIP footprint but different pinout (V–/Out/+In/–In/V+). | Preferred for ultra-low-power, single-supply systems needing full output swing to both rails. | Choose OPA344PA if output swing to V– is mandatory; verify PCB layout compatibility due to pinout mismatch. |
Compared with TL071CP and OPA344PA, the OPA137PA offers the optimal balance of ultra-low input bias current, moderate speed, and proven reliability in legacy industrial designs-making it ideal for upgrading aging analog subsystems where sensor interface fidelity is critical.
Availability
OPA137PA is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, precision integrators, and battery-powered instrumentation requiring stable component supply across long production lifecycles.
Supply support for OPA137PA 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 OPA137PA belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-cost, high-impedance analog signal conditioning in portable and industrial instrumentation.
FAQ
What is the maximum operating temperature range for the OPA137PA?
The OPA137PA is specified over –40°C to +85°C for parametric performance, and guaranteed to operate continuously from –55°C to +125°C. This extended operating range supports deployment in harsh industrial environments such as motor control cabinets and outdoor sensor nodes where ambient temperatures exceed standard commercial limits. Thermal resistance (θJA) for the 8-pin DIP package is 100°C/W, enabling reliable operation without forced airflow at moderate power dissipation.
Does the OPA137PA require external compensation for unity-gain stability?
No, the OPA137PA is internally compensated for unity-gain stability and does not require external compensation components. It remains stable with closed-loop gains ≥1 across all load conditions up to 1000 pF, as verified in the datasheet's small-signal step response and phase margin plots. This eliminates the need for external capacitors or resistors in buffer or gain-of-one configurations, simplifying layout and reducing bill-of-materials cost in precision analog signal chains.
Can the OPA137PA be used with a single +5V supply?
Yes, the OPA137PA 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 = +3 V to V+ = +5 V, allowing direct interfacing with 3.3 V logic-referenced sensors. Output swing is typically +1.2 V to +3.9 V (V– +1.2 V to V+ –1.1 V), so proper headroom must be maintained for full-scale signal handling. Bypassing V+ and V– with ≥10 nF ceramic capacitors is mandatory for stability.
What is the purpose of the NC pins on the OPA137PA 8-pin DIP package?
Pins 6, 7, and 8 on the OPA137PA are designated NC (no-connect) and are internally unconnected. They must remain electrically floating - never tied to ground, supply, or any other node - to avoid parasitic coupling or unintended current paths that could degrade noise performance or cause instability. This NC configuration distinguishes the OPA137PA from dual/quad variants (e.g., OPA2137, OPA4137) and ensures consistent pin compatibility across the family's single-channel DIP offerings.
How does the OPA137PA handle input overvoltage conditions beyond the supply rails?
The OPA137PA features diode clamping on both inputs to V+ and V– for ESD protection. Inputs may safely exceed the supply rails by up to 500 mV, but input current must be externally limited to ≤2 mA using a series resistor (e.g., 1 kΩ for ±1 V overvoltage). Exceeding this current risks unpredictable behavior in adjacent channels or damage to the input stage. Unlike many FET-input op-amps, the OPA137PA does not exhibit phase reversal when inputs exceed the common-mode range, preserving functional integrity in transient-overvoltage scenarios.
OPA137PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA137PA FAQ
1.How can I place an order for OPA137PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137PA 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 OPA137PA reliable?
The price and inventory of OPA137PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137PA is usually 5 days.
3.What payment methods are accepted for OPA137PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137PA?
OPA137PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137PA 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 OPA137PA?
For technical support, including OPA137PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137PA requirements.
6.How does Aetrix verify that OPA137PA is sourced from the original manufacturer or authorized distributors?
All OPA137PA 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 OPA137PA meets industry standards.
7.What is the process for return or replacement of OPA137PA?
All OPA137PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA137PA, 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 OPA137PA part is unused and in its original packaging.
Return procedure for OPA137PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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