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Texas Instruments OPA137N/3KG4
- Part No.:
- OPA137N/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA137N/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
OPA137N/3KG4 from Texas Instruments (formerly Burr-Brown) is a single-channel FET-input operational amplifier in SOT-23-5 package, delivering 5pA input bias current, 1.5mV max input offset voltage, 1MHz gain-bandwidth product, and 3.5V/µs slew rate. It operates from ±2.25V to ±18V dual supplies or +4.5V to +36V single supply, supporting precision signal conditioning in battery-powered instrumentation and photodetector interfaces.
For engineers reviewing the OPA137N/3KG4 datasheet, OPA137N/3KG4 pinout, OPA137N/3KG4 application, or OPA137N/3KG4 equivalent, key selection criteria include its rail-to-rail input capability (extends to V+), low quiescent current (220µA/channel), microsize SOT-23-5 footprint, and guaranteed performance over –40°C to +85°C.
Technical Context
The OPA137N/3KG4 employs JFET-input stage architecture enabling ultra-low input bias current (5pA typ) and high input impedance (10¹² Ω || 2pF). Its input common-mode range extends to the positive supply rail-critical for single-supply high-side sensing applications such as current monitoring in power rails.
It features unity-gain stability, no phase inversion under overdrive, and independent internal circuitry ensuring robust operation even when other amplifiers in multi-channel packages are saturated. Specified open-loop gain is 94dB, CMRR is 84dB, and PSRR is ±250µV/V over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 5pA typical - enables high-impedance sensor interfacing (e.g., photodiodes, strain gages) without significant error. |
| Input Offset Voltage | ±1.5mV max - supports DC-coupled precision amplification with <0.01% gain error in 100mV full-scale systems. |
| Gain-Bandwidth Product | 1MHz - allows stable closed-loop operation up to 100kHz at G=10, suitable for active filters and anti-aliasing stages. |
| Slew Rate | 3.5V/µs - ensures ≤10µs settling to 0.01% for 10V step, meeting dynamic response requirements in data acquisition front-ends. |
| Supply Range | ±2.25V to ±18V dual or +4.5V to +36V single - accommodates industrial 24V systems and portable 5V/9V battery designs. |
| Quiescent Current | 220µA per channel - enables >1-year battery life in always-on sensor nodes powered by CR2032 cells. |
| Operating Temperature | –40°C to +85°C - qualified for automotive under-hood and industrial control cabinet environments. |
Pinout & Package
OPA137N/3KG4 is packaged in a 5-pin SOT-23-5 surface-mount package (Package Drawing DBV), with thermal resistance θJA = 200°C/W. Pin 1 is marked with a dot; device orientation follows standard SOT-23 pinout convention.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In | Non-inverting input - accepts signals up to V+, enabling high-side current sensing without level-shifting. |
| 2 | –In | Inverting input - used for feedback configuration; internally clamped to V+ and V– for ESD protection. |
| 3 | Out | Amplifier output - drives loads up to 1000pF directly; output swing is (V–)+1.2V to (V+)–1.1V. |
| 4 | V– | Negative supply rail - must be bypassed with ≥10nF ceramic capacitor near the pin for stability. |
| 5 | V+ | Positive supply rail - shares same bypassing requirement; input common-mode range extends to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5pA input bias current enables direct connection to high-impedance sources like photodiodes without signal degradation. |
| Rail-to-rail input (to V+) | Supports single-supply operation with inputs referenced to V+, eliminating need for external bias networks in high-side sensing. |
| No phase inversion | Prevents catastrophic output reversal during input overvoltage - critical for closed-loop control and voltage-follower configurations. |
| Unity-gain stable | Operates reliably at G=1 without external compensation, simplifying design of buffers, integrators, and transimpedance amplifiers. |
| Low power consumption | 220µA quiescent current per channel allows integration into space-constrained, battery-operated IoT sensor nodes. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Wheatstone bridge output from metal foil strain gage in load cell, requiring high-impedance differential gain with minimal offset drift. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end configured as precision non-inverting amplifier with 100–1000× gain. Use Value: 5pA input bias current prevents bridge imbalance errors; 1.5mV offset ensures <0.1% full-scale error in 1mV/V bridge output. |
Use Scenario: Transimpedance amplification of nanoamp-level photocurrent from BPW34 photodiode in optical smoke detector. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier with 1MΩ feedback resistor and 3.3pF compensation. Use Value: 45nV/√Hz input voltage noise and 1.2fA/√Hz current noise preserve SNR; rail-to-rail input accommodates photodiode cathode bias at V+. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integrator in portable energy metering IC front-end, integrating current-sense voltage over time with sub-0.1% linearity. IC Role / Device Role / Timing Role: Op-amp in lossless integrator topology using polypropylene timing capacitor and low-leakage feedback path. Use Value: Ultra-low input bias current (5pA) minimizes integration drift; 94dB open-loop gain ensures <0.05% integrator error over 1-second period. |
Use Scenario: Signal conditioning stage in handheld multimeter or portable DMM, operating from two AA cells (3V) with extended shelf life. IC Role / Device Role / Timing Role: Single-supply buffer and gain stage for ADC driver, powered from regulated 3.3V LDO. Use Value: 220µA quiescent current enables >2-year battery life; wide supply range (+4.5V to +36V) supports future upgrade to Li-ion battery packs. |
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 |
|---|---|---|---|
| TLC2271CD | Higher input bias current (1pA typ vs 5pA), lower GBW (2.2MHz), higher IQ (1.1mA). | Better speed but unsuitable for ultra-high-Z sensors due to 10× higher IB; requires more PCB area for thermal management. | Select when bandwidth >1MHz is required and sensor impedance <100MΩ. |
| OPA316IDBVR | Lower offset (0.5mV max), lower noise (11nV/√Hz), higher IQ (400µA), same SOT-23-5 package. | Superior DC precision and AC performance, but 1.8× higher quiescent current reduces battery life in always-on devices. | Select when offset and noise dominate system error budget and power is secondary. |
Compared with TLC2271CD and OPA316IDBVR, the OPA137N/3KG4 uniquely balances ultra-low input bias current, micropower operation, and rail-to-rail input capability in a legacy-proven SOT-23-5 footprint-making it optimal for cost-sensitive, high-impedance, battery-constrained measurement systems where long-term stability matters more than raw speed.
Availability
OPA137N/3KG4 is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, and precision integrators requiring stable component supply across industrial, test equipment, and portable instrumentation programs.
Supply support for OPA137N/3KG4 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 decades of heritage in precision op-amps through its acquisition of Burr-Brown.
The OPA137N/3KG4 belongs to TI's MicroAmplifier™ series, designed specifically for low-cost, miniature, low-power precision analog signal conditioning in space- and energy-constrained applications.
FAQ
What is the maximum capacitive load the OPA137N/3KG4 can drive without instability?
The OPA137N/3KG4 is specified to drive up to 1000pF capacitive load while maintaining stability and specified settling time. This capability eliminates the need for isolation resistors in many transimpedance amplifier and filter applications. For loads exceeding 1000pF, external compensation (e.g., feedback capacitor or series resistor) is recommended. The OPA137N/3KG4 datasheet confirms stable operation with CL = 1000pF under unity-gain conditions.
Does the OPA137N/3KG4 support true rail-to-rail input operation?
The OPA137N/3KG4 supports input common-mode voltage from (V–)+3V up to V+, meaning it reaches the positive supply rail but not the negative rail. This "input-to-V+" feature enables high-side current sensing and single-supply operation without input level-shifting. However, inputs must remain ≥3V above V– for linear operation. The OPA137N/3KG4 does not support rail-to-rail input across both rails.
Is the OPA137N/3KG4 pin-compatible with other members of the OPA137 family?
Yes - all OPA137 variants (e.g., OPA137U, OPA137P, OPA137NA) share identical pinouts in their respective packages. The OPA137N/3KG4 in SOT-23-5 uses the standard 5-pin layout: Pin 1 = +In, Pin 2 = –In, Pin 3 = Out, Pin 4 = V–, Pin 5 = V+. This allows drop-in substitution among SOT-23-5 versions (e.g., OPA137N/250, OPA137NA/3K) without PCB changes.
What is the absolute maximum supply voltage rating for the OPA137N/3KG4?
The absolute maximum supply voltage for the OPA137N/3KG4 is ±18V (or 36V total between V+ and V–), as stated in the Absolute Maximum Ratings table. Operation beyond this risks permanent damage. The recommended operating range is ±2.25V to ±18V dual supply or +4.5V to +36V single supply. Exceeding ±18V violates the device's safe operating area and voids reliability guarantees for the OPA137N/3KG4.
How does the OPA137N/3KG4 handle input overvoltage conditions?
The OPA137N/3KG4 features internal ESD diodes that clamp inputs to V+ and V– rails. Input voltage may exceed the supplies by up to 500mV, but input current must be limited to ≤2mA to prevent latch-up or parametric shift. An external series resistor (e.g., 10kΩ) is recommended if transient overvoltage exceeds this margin. This protection scheme ensures robustness in noisy industrial environments where the OPA137N/3KG4 is commonly deployed.
OPA137N/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/3KG4 FAQ
1.How can I place an order for OPA137N/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137N/3KG4 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/3KG4 reliable?
The price and inventory of OPA137N/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137N/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA137N/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137N/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137N/3KG4?
OPA137N/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137N/3KG4 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/3KG4?
For technical support, including OPA137N/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137N/3KG4 requirements.
6.How does Aetrix verify that OPA137N/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA137N/3KG4 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/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA137N/3KG4?
All OPA137N/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA137N/3KG4, 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/3KG4 part is unused and in its original packaging.
Return procedure for OPA137N/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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