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Texas Instruments OPA137UA/2K5
- Part No.:
- OPA137UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA137UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,254
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Product details
Overview
OPA137UA/2K5 from Texas Instruments (formerly Burr-Brown) is a single-channel, FET-input operational amplifier in SOIC-8 package, designed for low-cost, low-power precision signal conditioning. It delivers 5 pA input bias current, 1.5 mV max input offset voltage, 1 MHz gain-bandwidth product, and operates from ±2.25 V to ±18 V supplies - ideal for battery-powered instrumentation and photodetector amplification.
For engineers reviewing the OPA137UA/2K5 datasheet, OPA137UA/2K5 pinout, OPA137UA/2K5 application, or OPA137UA/2K5 equivalent, key selection criteria include its rail-to-rail input capability (extends to V+), 220 µA/channel quiescent current, 3.5 V/µs slew rate, and guaranteed performance over –40°C to +85°C.
Technical Context
The OPA137UA/2K5 employs a JFET-input stage enabling ultra-low input bias current and high input impedance (10¹² Ω || 2 pF), making it suitable for high-impedance sensor interfaces. Its input common-mode 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 with output short-circuit or overload conditions. The device maintains linearity and low THD+N (0.05% at 1 kHz) across its full output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | ±5 pA typical - enables use with MΩ-range feedback networks without significant error |
| Input Offset Voltage | ±1.5 mV max - supports precision DC-coupled amplification with <0.1% gain error at 1 V output |
| Supply Voltage Range | ±2.25 V to ±18 V - compatible with dual-rail industrial systems and low-voltage portable designs |
| Quiescent Current | 220 µA per channel - allows continuous operation in microamp-powered sensor nodes |
| Gain-Bandwidth Product | 1 MHz - supports stable closed-loop gain up to 100 at 10 kHz with adequate phase margin |
| Slew Rate | 3.5 V/µs - ensures ≤10 µs settling to 0.1% for 10 V step, suitable for moderate-speed data acquisition |
| Input Common-Mode Range | (V–) + 3 V to V+ - permits direct sensing of signals referenced to positive rail (e.g., high-side current monitoring) |
Pinout & Package
OPA137UA/2K5 is housed in an 8-pin SOIC (SO-8) surface-mount package per JEDEC MS-012, with thermal resistance θJA = 150°C/W. Pin numbering follows standard SOIC convention: Pin 1 (top-left corner, marked by bevel or dot) is non-inverting input (+In); Pin 2 is inverting input (–In); Pin 3 is output (Out); Pin 4 is negative supply (V–); Pin 5 is not connected (NC); Pin 6 is not connected (NC); Pin 7 is positive supply (V+); Pin 8 is not connected (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | +In (non-inverting input) | High-impedance node accepting signal reference or feedback; must remain within (V–)+3 V to V+ for linear operation |
| Pin 2 | –In (inverting input) | High-impedance node for feedback or signal injection; internally clamped to rails for ESD protection |
| Pin 3 | Out (output) | Capable of sourcing/sinking ±25 mA; drives ≥1000 pF capacitive loads without instability |
| Pin 4 | V– (negative supply) | Reference for internal biasing; all inputs and outputs referenced to this potential |
| Pin 5 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
| Pin 6 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
| Pin 7 | V+ (positive supply) | Primary power rail; bypassing with ≥10 nF ceramic capacitor near pin is mandatory for stability |
| Pin 8 | NC | No internal connection; must be left floating or tied to ground per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | Enables 5 pA input bias current - critical for integrating photodiodes or strain gauges with >1 GΩ source impedances |
| Rail-to-rail input (to V+) | Supports high-side current sensing without external level shifters or bias resistors |
| No phase inversion on overdrive | Prevents latch-up or control-loop instability when inputs exceed common-mode range - unlike TL06x family |
| Unity-gain stable | Operates reliably in voltage-follower or gain-of-1 configurations without external compensation |
| Specified over –40°C to +85°C | Guarantees 1.5 mV offset, 1 MHz GBW, and 220 µA IQ across full industrial temperature range |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Amplifying low-level Wheatstone bridge output from metal foil or semiconductor strain gages in load cells or pressure sensors. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with high-Z differential input and low drift. Use Value: 5 pA input bias current prevents loading of high-resistance bridge arms; 1.5 mV offset minimizes zero-error in calibrated systems. | Use Scenario: Converting photocurrent from BPW34 or similar silicon photodiodes into measurable voltage in optical smoke detectors or spectrophotometers. IC Role / Device Role / Timing Role: Transimpedance amplifier with wide dynamic range and low noise floor. Use Value: 45 nV/√Hz input voltage noise and 1.2 fA/√Hz current noise preserve signal integrity at low light levels. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Building analog integrators for energy metering, PID controllers, or waveform generation where long-term drift must be minimized. IC Role / Device Role / Timing Role: Core op-amp in capacitor-feedback configuration with ultra-low input current. Use Value: 5 pA input bias current limits integration error to <1 µV/s at 1 nF capacitance - enabling hour-scale integration windows. | Use Scenario: Signal conditioning in handheld multimeters, portable gas analyzers, or wearable health monitors operating from coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Low-power analog front-end amplifier for sensor interface and ADC driver stages. Use Value: 220 µA quiescent current allows multi-year operation on CR2032; SO-8 package supports compact PCB layouts. |
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), wider supply range (±18 V), but lower cost | Less suitable for high-impedance sources or precision DC gain; acceptable for AC-coupled audio or general-purpose use | Select TL071CP only when cost sensitivity outweighs precision and input current requirements |
| OPA316IDBVR | Lower quiescent current (40 µA), rail-to-rail I/O, higher GBW (10 MHz), but higher input bias current (0.2 pA typ - still low) | Better for low-voltage (1.8–5.5 V) battery systems requiring faster response or full rail compliance at output | Choose OPA316IDBVR when operating below ±2.25 V or needing rail-to-rail output swing |
Compared with TL071CP and OPA316IDBVR, the OPA137UA/2K5 uniquely balances ultra-low input bias current (5 pA), industrial temperature rating, and SO-8 compatibility - making it optimal for legacy-compatible, high-impedance DC precision applications where supply voltage exceeds ±2.25 V.
Availability
OPA137UA/2K5 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 OPA137UA/2K5 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 continues to manufacture, test, and support its precision analog portfolio including the MicroAmplifier™ series.
The OPA137UA/2K5 belongs to TI's FET-input op-amp product line, engineered specifically for low-cost, miniature, low-power precision signal conditioning in instrumentation, sensor interfaces, and portable measurement equipment.
FAQ
What is the maximum capacitive load the OPA137UA/2K5 can drive without oscillation?
The OPA137UA/2K5 is specified to drive up to 1000 pF capacitive load while maintaining stability. This capability eliminates need for isolation resistors in many transimpedance or filter applications. For loads exceeding 1000 pF, a small series resistor (e.g., 10–50 Ω) between output and capacitor is recommended to ensure phase margin remains >45°.
Does the OPA137UA/2K5 support single-supply operation?
Yes, the OPA137UA/2K5 supports single-supply operation from +4.5 V to +36 V. Its input common-mode range extends to the positive rail (V+), enabling high-side sensing without level-shifting. Output swings to within 1.1 V of V+ and 1.2 V of V–, so proper headroom must be allocated for intended signal range.
Is the OPA137UA/2K5 pin-compatible with other SO-8 op-amps like the LM358?
No, the OPA137UA/2K5 is not pin-compatible with LM358 or other dual op-amps. As a single-channel device in SO-8, it uses Pins 1–3 and 4, 7–8 for signal and supply, while Pins 5, 6, and 8 are NC. LM358 (dual) occupies different pin functions. Always verify pin mapping using the official OPA137UA/2K5 datasheet before PCB layout.
What is the typical input voltage noise density of the OPA137UA/2K5 at 1 kHz?
The typical input voltage noise density of the OPA137UA/2K5 at 1 kHz is 45 nV/√Hz. This value, combined with its 1.2 fA/√Hz current noise, makes it well-suited for applications dominated by voltage noise (e.g., medium-impedance sources <100 kΩ) or where both noise types must be balanced in transimpedance designs.
How does the OPA137UA/2K5 handle input overvoltage conditions beyond the supply rails?
The OPA137UA/2K5 features internal ESD diodes clamping inputs to V+ and V–. If input voltage exceeds V– by more than 500 mV, input current must be limited to ≤2 mA using an external series resistor. Exceeding this current may cause unpredictable behavior in adjacent channels or damage the protection diodes.
OPA137UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
OPA137UA/2K5 FAQ
1.How can I place an order for OPA137UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA137UA/2K5 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 OPA137UA/2K5 reliable?
The price and inventory of OPA137UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA137UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA137UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA137UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA137UA/2K5?
OPA137UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA137UA/2K5 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 OPA137UA/2K5?
For technical support, including OPA137UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA137UA/2K5 requirements.
6.How does Aetrix verify that OPA137UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA137UA/2K5 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 OPA137UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA137UA/2K5?
All OPA137UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA137UA/2K5, 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 OPA137UA/2K5 part is unused and in its original packaging.
Return procedure for OPA137UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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