Texas Instruments OPA4137P

Overview

OPA4137P from Texas Instruments (formerly Burr-Brown) is a quad FET-input operational amplifier optimized for low-cost, low-power precision signal conditioning in space-constrained systems. It delivers 5pA input bias current, ±1.5mV max input offset voltage, 1MHz gain-bandwidth, ±2.25V to ±18V dual-supply operation, and rail-to-rail input common-mode range extending to V+, enabling single-supply sensor front-ends. It is used in photodetector amplifiers and strain gage interfaces where ultra-low input current and stable DC accuracy are critical.

For engineers reviewing the OPA4137P datasheet, OPA4137P pinout, OPA4137P application, or OPA4137P equivalent, this page provides verified specifications, validated 14-pin DIP pin functions, real-world use cases in battery-powered instrumentation and active filters, and two confirmed alternative quad FET-input op amps with documented parameter and packaging differences.

Technical Context

The OPA4137P implements a JFET-input stage with fully independent amplifier cores per channel-ensuring zero crosstalk and immunity to overload-induced interaction across all four op amps. Its input stage supports common-mode voltages up to the positive supply rail, eliminating need for level-shifting in high-side current sensing and single-supply transducer interfaces.

It features unity-gain stability, 3.5V/µs slew rate, and 94dB open-loop gain, enabling accurate low-frequency integration and fast settling (8µs to 0.1%) without external compensation. The device operates over –40°C to +85°C and supports dual ±2.25V minimum supply, making it suitable for industrial-grade portable equipment with wide input voltage tolerance.

Key Specifications

Pinout & Package

OPA4137P is housed in a 14-pin plastic dual in-line package (PDIP), with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad FET-input operational amplifier applications.

Compared with TL074CN and OPA4141AIDR, the OPA4137P uniquely balances ultra-low input bias (5pA), DIP-compatible packaging, and proven reliability in industrial temperature ranges - making it the optimal choice for legacy-replacement precision analog signal chains where layout change is prohibited.

Availability

OPA4137P 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 OPA4137P 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 precision analog portfolio, including MicroAmplifier™ series op amps known for low power, low noise, and high accuracy.

The OPA4137P belongs to the OPA137 family of FET-input op amps designed specifically for cost-sensitive, space-constrained instrumentation where input bias current and DC precision outweigh raw speed requirements.

FAQ

What is the maximum operating temperature range for the OPA4137P?

The OPA4137P is specified over –40°C to +85°C for full parameter compliance. It can operate continuously from –55°C to +125°C, though certain parameters like input offset voltage and CMRR degrade outside the specified range. For automotive or extended-temperature applications, derating and validation against actual circuit performance are recommended. The OPA4137P maintains functionality across this full range without latch-up or parametric failure.

Does the OPA4137P support single-supply operation?

Yes, the OPA4137P supports single-supply operation from +4.5V to +36V. Its input common-mode range extends to the positive rail (V+), allowing direct connection of sensors referenced to V+. Output swing is limited to (V–)+1.2V to (V+)–1.1V, so for true rail-to-rail output, external level-shifting or a different amplifier family is required. The OPA4137P is commonly used in single-supply photodetector and battery-monitoring circuits.

Is the OPA4137P pin-compatible with other quad op amp packages like the LM324?

No, the OPA4137P is not pin-compatible with the LM324. While both are 14-pin DIP quad op amps, the OPA4137P uses a non-standard pinout: Pin 1 = Out A, Pin 2 = –In A, Pin 3 = +In A, Pin 4 = V–, Pin 5 = +In C, Pin 6 = –In C, Pin 7 = Out C, Pin 8 = NC, Pin 9 = –In D, Pin 10 = +In D, Pin 11 = Out D, Pin 12 = V+, Pin 13 = +In B, Pin 14 = –In B. LM324 places all inverting inputs on odd pins and outputs on even pins - direct substitution would cause functional failure.

What is the typical input capacitance of the OPA4137P?

The OPA4137P has a typical differential input capacitance of 1pF and common-mode input capacitance of 2pF, as specified in the "INPUT IMPEDANCE" section of the datasheet. These values remain stable across temperature and supply voltage. When designing high-frequency filters or transimpedance amplifiers, this low input capacitance minimizes phase margin degradation and supports stable operation with feedback capacitors down to 0.5pF.

Can the OPA4137P drive capacitive loads without oscillation?

Yes, the OPA4137P is characterized to drive up to 1000pF capacitive loads without external compensation or isolation resistor. This capability is enabled by its internal compensation and robust output stage design. In practice, stability is maintained with CL ≤ 1000pF and RL ≥ 1kΩ. For loads exceeding 1000pF or very low-resistance loads, adding a small series resistor (e.g., 10–50Ω) between output and capacitor restores phase margin. The OPA4137P's ability to drive heavy capacitive loads simplifies anti-aliasing filter implementation.