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Texas Instruments OPA137P
- Part No.:
- OPA137P
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA137P.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,960
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Product details
Overview
OPA137P from Texas Instruments (formerly Burr-Brown) is a single-channel FET-input operational amplifier in an 8-pin DIP package, designed for precision, low-power, and single-supply operation. It delivers 5pA input bias current, 1.5mV max input offset voltage, 1MHz gain-bandwidth, ±2.25V to ±18V dual supply range (or +4.5V to +36V single supply), and rail-to-rail input common-mode range extending to V+. It is used in photodetector amplifiers, strain gage interfaces, and battery-powered instrumentation where low quiescent current (220µA) and high input impedance are critical.
For engineers reviewing the OPA137P datasheet, OPA137P pinout, OPA137P application, or OPA137P equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, confirmed alternatives with documented differences, and supply-chain support details specific to the OPA137P DIP variant - not generic OPA137 family data.
Technical Context
The OPA137P implements a JFET-input stage enabling ultra-low input bias current (5pA typ) and high input impedance (10¹² Ω || 2pF), making it suitable for high-impedance sensor interfacing. Its input common-mode range extends to the positive supply rail (V+), eliminating need for level-shifting in single-supply configurations.
It features unity-gain stability, 3.5V/µs slew rate, and 94dB open-loop gain, supporting precision DC-coupled amplification and active filtering up to 1MHz. The device operates across –40°C to +85°C and supports robust ESD protection with diode-clamped inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 5pA typical - enables accurate amplification of nanoamp-level sensor currents without significant error. |
| Input Offset Voltage | ±1.5mV maximum - ensures ≤0.01% gain error in 100mV full-scale precision measurement circuits. |
| Supply Range | ±2.25V to ±18V dual or +4.5V to +36V single - supports wide industrial and battery-powered voltage rails. |
| Gain-Bandwidth Product | 1MHz - allows stable closed-loop operation at gains up to 100 with usable bandwidth ≥10kHz. |
| Quiescent Current | 220µA per channel - enables multi-hour operation on coin-cell batteries in portable instrumentation. |
| Input Common-Mode Range | (V–) + 3V to V+ - permits direct sensing of signals referenced to V+, e.g., high-side current monitoring. |
| Slew Rate | 3.5V/µs - supports <10µs settling to 0.1% for 10V step outputs, suitable for moderate-speed data acquisition. |
Pinout & Package
OPA137P is housed in an 8-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole footprint. Thermal resistance θJA is 100°C/W, enabling operation up to +85°C ambient without forced airflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In | Non-inverting input terminal - high-impedance node accepting signal source directly (e.g., photodiode cathode). |
| 2 | –In | Inverting input terminal - connects to feedback network; sensitive to stray capacitance due to FET input. |
| 3 | Out | Amplifier output - drives loads up to 1000pF capacitive; limited to (V–)+1.2V to (V+)–1.1V swing. |
| 4 | V– | Negative supply pin - must be connected to ground or negative rail; input common-mode lower bound is (V–)+3V. |
| 5 | NC | No connect - internally unconnected; must remain floating or grounded per layout best practices. |
| 6 | NC | No connect - internally unconnected; no routing or soldering required. |
| 7 | V+ | Positive supply pin - accepts up to +36V; bypassing with ≥10nF ceramic capacitor is mandatory for stability. |
| 8 | NC | No connect - internally unconnected; leave unpopulated on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5pA input bias current enables accurate integration and high-Z sensor interfacing without leakage-induced drift. |
| Rail-to-rail input common-mode range | Extends to V+, allowing direct high-side current sensing and elimination of input biasing networks in single-supply designs. |
| No phase inversion | Prevents catastrophic output reversal when inputs exceed common-mode limits - critical for closed-loop stability in control systems. |
| Unity-gain stable | Operates reliably at gain = 1 without external compensation, simplifying design of voltage followers and active filters. |
| Low quiescent current | 220µA/channel supports >1-year battery life in portable test equipment using two AA cells. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
|
Use Scenario: Wheatstone bridge with 350Ω foil strain gages in structural health monitoring. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with 1000× gain, rejecting common-mode bridge offset while preserving µV-level differential signals. Use Value: 5pA input bias avoids loading high-resistance bridge arms; 1.5mV offset ensures <0.1% measurement error at full scale. |
Use Scenario: Transimpedance amplification of BPW34 photodiode output in optical smoke detector. IC Role / Device Role / Timing Role: Low-noise current-to-voltage converter with 1MΩ feedback resistor and 3.3pF compensation. Use Value: Input voltage noise density (45nV/√Hz) and negligible bias current prevent dark-current corruption of weak photocurrent signals. |
| Precision Integrator | Battery-Powered Instrumentation |
|
Use Scenario: Analog integrator in energy metering IC reference design for kWh accumulation. IC Role / Device Role / Timing Role: Ultra-low-leakage integrator core using polypropylene hold capacitor and OPA137P's 5pA bias current. Use Value: 5pA bias current limits integration drift to <1µV/s - enabling 16-bit accuracy over 1-second intervals without auto-zero. |
Use Scenario: Front-end signal conditioning in handheld multimeter with 200-hour alkaline battery life. IC Role / Device Role / Timing Role: Low-power buffer and gain stage for 100mV–2V input ranges, operating from single 9V battery. Use Value: 220µA quiescent current minimizes standby drain; rail-to-rail input allows full utilization of 0–9V dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CP | Higher input offset (10mV max), lower GBW (850kHz), same DIP-8 package and 5pA IB. | Less suitable for sub-mV precision but adequate for cost-sensitive general-purpose amplification. | Select when offset tolerance >5mV is acceptable and supply current <150µA is required. |
| TL071CP | Higher input bias (30pA), higher noise (18nV/√Hz), wider supply range (±22V), same DIP-8. | Better for high-speed AC-coupled audio; unsuitable for high-Z DC sensors due to 6× higher IB. | Select only for non-precision, higher-slew-rate applications where input impedance >10¹⁰Ω is not required. |
Compared with TLC27L2CP and TL071CP, the OPA137P offers superior DC precision (lower VOS, tighter drift), lower noise, and guaranteed rail-to-rail input operation - making it the preferred choice for battery-powered precision analog front-ends where long-term stability and minimal sensor loading are essential.
Availability
OPA137P is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, and precision integrators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA137P 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 high-precision analog ICs. TI is a global leader in analog and embedded processing, with manufacturing and quality systems certified to ISO 9001 and IATF 16949.
The OPA137P belongs to TI's MicroAmplifier™ series - engineered for low-cost, miniature, low-power precision signal conditioning in instrumentation, industrial sensing, and portable test equipment.
FAQ
What is the maximum operating temperature range for the OPA137P?
The OPA137P is specified for operation from –40°C to +85°C and can survive storage and transient exposure from –55°C to +125°C. Its thermal resistance (θJA = 100°C/W) allows reliable use in unventilated enclosures up to +85°C ambient when mounted on standard FR-4 PCBs with minimal copper pour.
Does the OPA137P require external compensation for unity-gain stability?
No - the OPA137P is internally compensated for unity-gain stability. It drives capacitive loads up to 1000pF without oscillation and does not require external phase-compensation components in standard inverting or non-inverting configurations with gains ≥1.
Can the OPA137P operate from a single +5V supply?
Yes - the OPA137P supports single-supply operation from +4.5V to +36V. With a +5V rail, its input common-mode range is +3V to +5V, and output swings from +1.2V to +3.9V, enabling use in 3.3V logic-compatible systems with appropriate input biasing.
What is the purpose of the NC pins on the OPA137P DIP package?
Pins 5, 6, and 8 on the OPA137P are no-connect (NC) terminals - they are not bonded internally and serve no electrical function. They must remain unconnected on the PCB; grounding or routing them may introduce parasitic coupling or violate package mechanical integrity.
How does the OPA137P handle input voltages exceeding the supply rails?
The OPA137P features diode clamps from each input to V+ and V–, allowing input overvoltage up to ±0.7V beyond the rails without damage. However, input current must be limited to ≤2mA using series resistors to prevent latch-up or unpredictable behavior in multi-amplifier packages.
OPA137P 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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA137P FAQ
1.How can I place an order for OPA137P through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137P 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 OPA137P reliable?
The price and inventory of OPA137P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137P is usually 5 days.
3.What payment methods are accepted for OPA137P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137P?
OPA137P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137P 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 OPA137P?
For technical support, including OPA137P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137P requirements.
6.How does Aetrix verify that OPA137P is sourced from the original manufacturer or authorized distributors?
All OPA137P 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 OPA137P meets industry standards.
7.What is the process for return or replacement of OPA137P?
All OPA137P units undergo pre-shipment inspection (PSI). If there is an issue with OPA137P, 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 OPA137P part is unused and in its original packaging.
Return procedure for OPA137P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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