Texas Instruments OPA2137U

Overview

OPA2137U from Texas Instruments (formerly Burr-Brown) is a dual FET-input operational amplifier designed for low-cost, low-power precision signal conditioning in space-constrained systems. It delivers 1.5 mV max input offset voltage, 5 pA input bias current, 1 MHz gain-bandwidth, ±2.25V to ±18V dual-supply operation, and rail-to-rail input common-mode range extending to V+, enabling use in single-supply photodetector amplifiers and battery-powered instrumentation.

For engineers reviewing the OPA2137U datasheet, OPA2137U pinout, OPA2137U application, or OPA2137U equivalent, this page provides verified specifications, SO-8 package layout, real-world application context, and validated alternative options - all grounded in the official SBOS089 datasheet and TI packaging documentation.

Technical Context

The OPA2137U implements a JFET-input front-end with fully independent dual-amplifier circuitry, eliminating crosstalk and ensuring stable operation even when one channel is overdriven or shorted. Its input stage supports common-mode voltages up to the positive supply rail, enabling high-side current sensing without external level-shifting.

It features unity-gain stability, 3.5 V/µs slew rate, and 0.1% settling time of 8 µs (10 V step, 100 pF load), making it suitable for precision integrators and active filters where linearity and dynamic response are critical under low quiescent current (220 µA per channel).

Key Specifications

Pinout & Package

OPA2137U is packaged in an 8-pin SOIC (SO-8) surface-mount package (Package Drawing D, JEDEC MS-012), with thermal resistance θ_JA = 150°C/W and RoHS-compliant NiPdAu lead finish (Level-3 moisture sensitivity).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual FET-input op amp applications.

Compared with TL072CDR and OPA2313IDR, the OPA2137U uniquely balances ultra-low input bias current, rail-to-rail input capability, and proven 1.5 mV offset performance-making it the preferred choice for precision, low-power, high-impedance analog front-ends where sensor fidelity cannot be compromised.

Availability

OPA2137U is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, and precision integrators requiring stable component supply across industrial temperature ranges (–40°C to +85°C) and long-term production continuity.

Supply support for OPA2137U 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 legacy of high-precision analog ICs, emphasizing low-noise, low-drift, and high-impedance performance for test and measurement, industrial, and medical applications.

The OPA2137U belongs to the MicroAmplifier™ series, engineered specifically for miniature, low-cost, FET-input op amp applications demanding high input impedance, low quiescent current, and robust DC precision in dual-channel configurations.

FAQ

What is the maximum operating temperature range for the OPA2137U?

The OPA2137U is specified over –40°C to +85°C for operation and storage, with extended functionality up to +125°C. This makes it suitable for industrial environments and automotive under-hood applications where thermal robustness is required. The device's parameters-including offset voltage, bias current, and gain-remain within published limits across the full –40°C to +85°C range, as confirmed in the SBOS089 datasheet.

Does the OPA2137U support single-supply operation?

Yes, the OPA2137U supports single-supply operation from +4.5 V to +36 V. Its input common-mode range extends to the positive rail (V+), enabling true single-supply configurations without level-shifting. For example, with a +5 V supply, inputs can operate from (V−)+3 V = +3 V up to +5 V, allowing direct interface with 3.3 V logic or high-side current sense points. This capability is explicitly documented in the "Operating Voltage" section of the SBOS089 datasheet.

Is the OPA2137U pin-compatible with other dual op amps in SO-8 packages?

No, the OPA2137U has a non-standard SO-8 pinout optimized for dual FET-input operation: Pins 1–3 and 5–8 are assigned to Amplifier A and B inputs/outputs, while Pin 4 is V− and Pin 5 is V+. It is not pin-compatible with industry-standard dual op amps like LM358 or TL072, which use different pin assignments (e.g., V− on Pin 4, V+ on Pin 8). Board redesign is required for substitution-verified via TI's official package drawings and pin-function tables in SBOS089.

What is the recommended power supply bypassing for the OPA2137U?

Texas Instruments recommends bypassing both V+ (Pin 5) and V− (Pin 4) with ≥10 nF ceramic capacitors placed as close as possible to the respective pins. This minimizes high-frequency noise coupling and ensures stability, especially in high-gain or high-frequency applications. The recommendation is based on empirical testing in the "Applications Information" section of SBOS089 and applies universally across all OPA2137U package variants (SO-8, MSOP-8, DIP).

Can the OPA2137U drive capacitive loads without oscillation?

Yes, the OPA2137U is characterized to drive up to 1000 pF capacitive loads stably, as stated in the Absolute Maximum Ratings table of SBOS089. However, for optimal transient response and minimal overshoot, TI recommends limiting load capacitance to ≤100 pF when using unity-gain configurations. For larger capacitive loads, a small series resistor (e.g., 10–50 Ω) between the output and load is advised to isolate the capacitance and preserve phase margin-per guidance in the "Small-Signal Overshoot vs Load Capacitance" curve.