Texas Instruments OPA137N/250

Overview

OPA137N/250 from Texas Instruments (formerly Burr-Brown) is a single-channel FET-input operational amplifier in a 5-pin SOT-23 package, delivering 5pA input bias current, 1.5mV max input offset voltage, 1MHz gain-bandwidth product, and 220µA quiescent current per channel. It operates from ±2.25V to ±18V dual supplies or +4.5V to +36V single supply, with rail-to-rail input common-mode range extending to V+, enabling precision signal conditioning in battery-powered instrumentation and photodetector interfaces.

For engineers reviewing the OPA137N/250 datasheet, OPA137N/250 pinout, OPA137N/250 application, or OPA137N/250 equivalent, key selection criteria include its FET-input low IB for high-impedance sensor interfacing, wide supply flexibility for portable designs, guaranteed –40°C to +85°C operation, and SOT-23-5 footprint for space-constrained PCB layouts.

Technical Context

The OPA137N/250 uses a JFET-input stage to achieve ultra-low input bias current (5pA typ), making it suitable for applications where leakage-sensitive nodes-such as photodiode transimpedance amplifiers or high-value resistor networks-are critical. Its input common-mode voltage extends to the positive supply rail, eliminating need for level-shifting in single-supply configurations.

It features unity-gain stability, 3.5V/µs slew rate, and 94dB open-loop gain, supporting accurate DC-coupled amplification and fast settling (8µs to 0.1%) without phase inversion-a known issue in legacy FET op amps. The device maintains performance across ±2.25V to ±18V supply range with minimal variation in quiescent current and offset drift.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package (Package Drawing DBV), 2.9mm × 1.6mm footprint, 1.1mm height, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL071CP and OPA316IDBVR, the OPA137N/250 uniquely balances ultra-low input bias (5pA), wide supply range (±2.25V to ±18V), and proven robustness in high-impedance DC applications-making it irreplaceable where sensor leakage dominates error budgets.

Availability

OPA137N/250 is available at Aetrix Electronics and suitable for battery-powered instruments, photodetector amplifiers, and precision integrators requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA137N/250 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 its legacy of precision analog ICs, with over 50 years of leadership in op amp design, manufacturing, and reliability validation.

The OPA137N/250 belongs to TI's MicroAmplifier™ series, engineered specifically for miniature, low-cost, low-power precision signal conditioning in space- and energy-constrained applications such as portable test equipment and sensor modules.

FAQ

What is the maximum operating temperature range for the OPA137N/250?

The OPA137N/250 is specified from –40°C to +85°C for reliable operation, with extended functionality from –55°C to +125°C. Its thermal resistance (θJA) is 200°C/W in the SOT-23-5 package, so ambient temperature must remain within limits when dissipating >10mW to avoid junction overheating. All electrical parameters in the datasheet are guaranteed across the –40°C to +85°C range.

Does the OPA137N/250 require external compensation for unity-gain stability?

No, the OPA137N/250 is internally compensated and unity-gain stable. It does not require external capacitors or resistors to maintain phase margin in voltage-follower or G = 1 inverting configurations. This simplifies layout and eliminates risk of oscillation due to stray capacitance-especially important in compact SOT-23-5 implementations.

Can the OPA137N/250 be used with a single +5V supply?

Yes, the OPA137N/250 supports single-supply operation from +4.5V to +36V. With a +5V rail, its input common-mode range spans from (V–)+3V = 0V+3V = +3V to V+ = +5V, meaning inputs must be ≥+3V for linear operation. For lower input voltages, a level-shifting network or biasing circuit is required-unlike rail-to-rail input op amps.

What is the purpose of the internal ESD protection diodes on the OPA137N/250 inputs?

The OPA137N/250 includes internal diodes clamping inputs to V+ and V– for ESD protection. If input voltage exceeds V+ by >500mV or falls below V– by >500mV, input current must be limited to ≤2mA using an external series resistor. Exceeding this current risks latch-up or parametric shift, especially in multi-amplifier packages where one channel's overload may affect others.

How does the OPA137N/250 compare to the dual OPA2137 in terms of pin compatibility?

The OPA137N/250 (SOT-23-5) and OPA2137 (MSOP-8 or SO-8) are not pin-compatible-OPA137N/250 has 5 pins (V+, –In, Out, V–, +In), while OPA2137 has 8 pins with two independent amplifiers. They share identical electrical specifications per channel, but PCB layout, decoupling, and routing must be redesigned when switching between single and dual versions.