Texas Instruments OPA4137PAG4

Overview

OPA4137PAG4 from Texas Instruments 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 (or +4.5V to +36V single supply), 5 pA input bias current, and 1.5 mV max input offset voltage - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodetector front-ends.

For engineers reviewing the OPA4137PAG4 datasheet, OPA4137PAG4 pinout, OPA4137PAG4 application, or OPA4137PAG4 equivalent, this page provides verified specifications, validated pin functions, real-world use cases in strain gage and active filter designs, and two confirmed alternative parts with documented parameter and application differences.

Technical Context

The OPA4137PAG4 integrates four fully independent FET-input amplifier channels in a single 14-pin DIP package, eliminating crosstalk and interaction between channels. Its rail-to-rail input common-mode range extends to the positive supply rail, supporting high-side current sensing and single-supply configurations without external level-shifting.

Each channel features unity-gain stability, 94 dB open-loop gain, 74–84 dB CMRR over –40°C to +85°C, and guaranteed performance across ±2.25V to ±18V supplies. Input protection diodes clamp terminals to V+ and V–, and internal circuitry prevents phase inversion during common-mode overrange conditions.

Key Specifications

Pinout & Package

OPA4137PAG4 is housed in a 14-pin plastic dual in-line package (PDIP), with 0.300-inch body width and through-hole mounting. Thermal resistance θ_JA = 80°C/W enables reliable operation at full spec without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4137PAG4, OPA4132UA trades 10× higher power for 8× more bandwidth and lower noise, while TL074CDR sacrifices rail-to-rail input, DC precision, and quiescent current efficiency for cost reduction - making OPA4137PAG4 optimal for low-power, high-accuracy, single-supply sensor interfaces.

Availability

OPA4137PAG4 is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector front-ends, and precision integrators requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.

Supply support for OPA4137PAG4 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 is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in precision op amps, data converters, and power management ICs.

The OPA4137PAG4 belongs to TI's MicroAmplifier™ series - engineered specifically for low-cost, miniature, low-power precision analog signal conditioning in portable and industrial instrumentation.

FAQ

What is the maximum supply voltage for OPA4137PAG4?

The OPA4137PAG4 supports dual supplies from ±2.25 V to ±18 V, or a single supply from +4.5 V to +36 V. Absolute maximum ratings specify ±18 V on V+ and V–, with input voltages limited to (V–) –0.7 V to (V+) +0.7 V. Exceeding these may cause permanent damage. The OPA4137PAG4 operates reliably within its specified range across –40°C to +85°C.

Does OPA4137PAG4 support rail-to-rail input?

Yes - the OPA4137PAG4 input common-mode voltage range extends from (V–) + 3 V to V+, meaning it accepts signals up to the positive supply rail. This enables high-side current sensing and simplifies single-supply design. However, output swing is limited to (V–) + 1.2 V to (V+) – 1.1 V, so it is not rail-to-rail output. The OPA4137PAG4 maintains phase integrity even when inputs exceed the common-mode range.

What is the typical input bias current of OPA4137PAG4?

The typical input bias current of OPA4137PAG4 is ±5 pA at +25°C, with a maximum of ±100 pA over –40°C to +85°C. This ultra-low value minimizes voltage errors in high-impedance circuits such as photodiode transimpedance amplifiers or precision integrators. Input bias current increases with temperature and varies with common-mode voltage relative to V–, as shown in the "Input Bias Current vs Temperature" curve in the datasheet. The OPA4137PAG4 achieves this using a matched FET input stage.

Can OPA4137PAG4 drive capacitive loads?

Yes - the OPA4137PAG4 is specified to drive up to 1000 pF capacitive loads without oscillation, thanks to its unity-gain stable architecture and internal compensation. For loads >100 pF, adding a small series resistor (e.g., 10–50 Ω) between the output and capacitor improves stability margin. The OPA4137PAG4 maintains 0.01% settling in ≤10 µs with 100 pF load and 10 V step, confirming robust dynamic performance into moderate capacitance.

Is OPA4137PAG4 pin-compatible with other quad op amps?

No - the OPA4137PAG4 uses a non-standard 14-pin DIP pinout optimized for independent channel routing (e.g., Pins 1–3 = Amp A, Pins 5–7 = Amp C, etc.), differing from industry-standard quad op amp layouts like LM324 or TL074. Direct replacement requires PCB redesign. The OPA4137PAG4 shares package dimensions with standard 14-pin DIP footprints but has unique terminal assignments confirmed in the SBOS089 datasheet. Always verify pin mapping before substitution.