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Texas Instruments OPA4137U
- Part No.:
- OPA4137U
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4137U.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,344
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Product details
Overview
OPA4137U from Texas Instruments (formerly Burr-Brown) is a quad FET-input operational amplifier designed for precision, low-power, and single-supply operation. It delivers 1 MHz gain-bandwidth, 3.5 V/µs slew rate, ±2.25V to ±18V dual supply range (or +4.5V to +36V single supply), 5 pA input bias current, and 1.5 mV max input offset voltage at 25°C - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodetector interfaces.
For engineers reviewing the OPA4137U datasheet, OPA4137U pinout, OPA4137U application, or OPA4137U equivalent, key selection considerations include its rail-to-rail input capability (common-mode extends to V+), 220 µA/channel quiescent current, SO-14 package footprint, –40°C to +85°C temperature rating, and guaranteed channel independence for low crosstalk in multi-channel analog front-ends.
Technical Context
The OPA4137U implements a JFET-input stage with unity-gain stable architecture, supporting both single- and dual-supply configurations without phase inversion. Its input common-mode range includes the positive rail, allowing direct sensing of signals near V+, while internal ESD protection diodes clamp inputs to V+ and V–.
All four amplifiers operate with fully independent circuitry - eliminating interaction during overload or short-circuit events. The device maintains 94 dB open-loop gain and 74 dB CMRR over –40°C to +85°C, with input voltage noise density of 45 nV/√Hz at 1 kHz and 2 µVP-P (0.1–10 Hz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±2.25V to ±18V dual or +4.5V to +36V single - supports wide industrial and portable power architectures |
| Input Bias Current | ±5 pA typical at 25°C - enables high-impedance sensor interfacing (e.g., photodiodes, strain gages) with minimal error |
| Input Offset Voltage | ±1.5 mV max at 25°C - ensures <0.01% gain error in 100× gain stages at room temperature |
| Gain-Bandwidth Product | 1 MHz - allows stable closed-loop operation up to ~100 kHz with G = 10, suitable for active filters and integrators |
| Quiescent Current | ±220 µA per channel - enables ultra-low-power operation in battery-powered instruments with four simultaneous channels |
| Slew Rate | 3.5 V/µs - supports 10 V step settling in <10 µs (0.1%) with 100 pF load, critical for fast pulse amplification |
| Common-Mode Input Range | (V–) + 3 V to V+ - permits high-side current sensing and single-supply transducer amplification without level-shifting |
Pinout & Package
OPA4137U is packaged in a 14-pin SOIC (SO-14) surface-mount package with standard 1.27 mm pitch and JEDEC MS-012AC outline. Thermal resistance θJA is 100°C/W, supporting operation up to +85°C ambient with moderate PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives loads up to 1000 pF; limited to (V–)+1.2V to (V+)–1.1V swing |
| 2 | –In A | Inverting input of Amplifier A - high-impedance node (1012 Ω || 2 pF); requires external biasing for single-supply use |
| 3 | +In A | Non-inverting input of Amplifier A - same impedance as Pin 2; common-mode range extends to V+ |
| 4 | V– | Negative supply rail - shared by all four amplifiers; must be bypassed with ≥10 nF ceramic capacitor |
| 5 | +In C | Non-inverting input of Amplifier C - electrically isolated from other channels; no crosstalk under overload |
| 6 | –In C | Inverting input of Amplifier C - identical specs and layout independence as Pins 2 and 3 |
| 7 | Out C | Amplifier C output - fully independent; short-circuit protected with ±25/+60 mA current limit |
| 8 | Out A | Amplifier A output - duplicate label in original drawing; confirmed as Out A (Pin 1 is primary) |
| 9 | –In A | Amplifier A inverting input - duplicate label; Pin 2 is canonical |
| 10 | +In A | Amplifier A non-inverting input - duplicate label; Pin 3 is canonical |
| 11 | V+ | Positive supply rail - shared by all amplifiers; bypassing required for stability and PSRR performance |
| 12 | +In B | Non-inverting input of Amplifier B - independent biasing and signal path; no interaction with A/C/D |
| 13 | –In B | Inverting input of Amplifier B - matched input characteristics to other channels |
| 14 | Out B | Amplifier B output - full rail-to-rail output drive capability within specified voltage limits |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | 5 pA input bias current enables >100 MΩ source impedance interfacing without significant DC error |
| Rail-to-rail input common-mode range | Accepts signals up to V+, eliminating need for level-shifters in high-side current sensing and single-supply transducer amps |
| Channel independence | No crosstalk between amplifiers - one channel can be overloaded or shorted without affecting others' performance |
| Low quiescent current | 220 µA per channel allows four-channel precision amplification in sub-1 mA total system budget |
| Unity-gain stability | Operates stably at G = 1 without external compensation - simplifies design of buffers, integrators, and active filters |
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-Z differential input and low drift. Use Value: 5 pA input bias current prevents bridge imbalance errors; 1.5 mV offset enables <0.1% full-scale accuracy in 10 mV/V bridges. |
Use Scenario: Transimpedance amplification of current from BPW34 or similar silicon photodiodes in optical encoders and spectrometers. IC Role / Device Role / Timing Role: Low-noise, high-gain TIA with 45 nV/√Hz input voltage noise and 1 MHz bandwidth. Use Value: Enables 10⁶ V/A gain with <10 µs settling on 10 V steps - critical for high-speed light-pulse detection. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integration in PID controllers, waveform generators, and energy metering ICs. IC Role / Device Role / Timing Role: Unity-gain stable op-amp with 94 dB open-loop gain and low input bias current. Use Value: 5 pA bias current minimizes integration drift; 1 MHz GBW supports accurate integration up to 10 kHz input frequencies. |
Use Scenario: Signal conditioning in handheld multimeters, portable gas analyzers, and field-deployable data loggers. IC Role / Device Role / Timing Role: Quad-channel analog front-end for simultaneous sensor readout with ultra-low power consumption. Use Value: 220 µA/channel quiescent current enables >100-hour battery life on two AA cells while maintaining 16-bit-equivalent linearity. |
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 |
|---|---|---|---|
| TL074CDR | Higher input bias current (30 pA typ), higher noise (18 nV/√Hz), wider offset range (±10 mV), but lower cost and broader temp range (–40°C to +105°C) | Less suitable for high-impedance sensors or low-drift integrators; acceptable for general-purpose AC-coupled audio and filtering | Select TL074CDR only when cost sensitivity outweighs precision requirements and input impedance >10 MΩ is not needed. |
| OPA4140AIDR | Lower input bias current (1 pA typ), lower offset (±125 µV), lower noise (5.1 nV/√Hz), but higher quiescent current (1.5 mA/channel) and higher cost | Better for femtoamp-level photodiode currents or microvolt-level sensor signals; unsuitable for sub-mA battery systems | Choose OPA4140AIDR when sub-microvolt offset and sub-10 fA bias current are mandatory, and power budget allows >6× higher current. |
Compared with TL074CDR and OPA4140AIDR, the OPA4137U uniquely balances ultra-low input bias current (5 pA), low quiescent power (220 µA/channel), and rail-to-rail input capability - making it optimal for portable precision analog systems where sensor impedance, battery life, and single-supply simplicity are jointly constrained.
Availability
OPA4137U is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, precision integrators, battery-powered instruments, test equipment, and active filters requiring stable component supply across industrial and embedded OEM programs.
Supply support for OPA4137U 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 delivering analog and embedded processing solutions, with heritage in precision op-amps dating to Burr-Brown acquisition in 2000.
The OPA4137U belongs to TI's MicroAmplifier™ series - engineered for miniature, low-cost, low-power FET-input op-amps targeting portable instrumentation, sensor signal chains, and space-constrained industrial modules.
FAQ
What is the maximum capacitive load the OPA4137U can drive without instability?
The OPA4137U is specified to drive up to 1000 pF capacitive load while maintaining stability and specified phase margin. This capability supports direct connection to ADC input capacitors, long cables, or multiple downstream nodes without external isolation resistors - provided the feedback network remains purely resistive and the supply bypassing meets the 10 nF minimum recommendation.
Does the OPA4137U support true rail-to-rail output swing?
No, the OPA4137U does not provide rail-to-rail output. Its output voltage swing is specified as (V–) + 1.2 V to (V+) – 1.1 V under 10 kΩ load. This limitation arises from the output stage topology and must be accounted for in single-supply designs where headroom near either rail is critical.
Can the OPA4137U be used with a single +5V supply?
Yes, the OPA4137U operates from +4.5V to +36V single supply. With +5V, the input common-mode range extends from (V–)+3V = +3V to V+ = +5V, so inputs must be biased above +3V for linear operation. Output swing will be approximately +1.2V to +3.9V, requiring careful reference and signal level planning.
How is channel separation measured in the OPA4137U, and what is its value?
Channel separation in the OPA4137U is measured as the attenuation of a signal injected into one amplifier's input appearing at another amplifier's output. At DC, it is specified as 0.6 µV/V (≈124 dB), and remains >80 dB up to 100 kHz - confirming complete electrical isolation between all four amplifiers due to independent die layouts and supply routing.
What is the thermal resistance (θJA) of the OPA4137U in SO-14 package?
The OPA4137U in SO-14 package has a junction-to-ambient thermal resistance (θJA) of 100°C/W under standard JEDEC test conditions (2s2p board). This value assumes minimal PCB copper; adding thermal vias and 1–2 cm² of 2-oz copper pour beneath the exposed pad (if present) or adjacent to pins can reduce effective θJA by 20–30%.
OPA4137U Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- 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:
- 14-SOIC
OPA4137U FAQ
1.How can I place an order for OPA4137U through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4137U 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 OPA4137U reliable?
The price and inventory of OPA4137U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4137U is usually 5 days.
3.What payment methods are accepted for OPA4137U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4137U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4137U?
OPA4137U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4137U 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 OPA4137U?
For technical support, including OPA4137U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4137U requirements.
6.How does Aetrix verify that OPA4137U is sourced from the original manufacturer or authorized distributors?
All OPA4137U 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 OPA4137U meets industry standards.
7.What is the process for return or replacement of OPA4137U?
All OPA4137U units undergo pre-shipment inspection (PSI). If there is an issue with OPA4137U, 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 OPA4137U part is unused and in its original packaging.
Return procedure for OPA4137U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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