Texas Instruments OPA2137UA

Overview

OPA2137UA from Texas Instruments (formerly Burr-Brown) is a dual FET-input operational amplifier in SO-8 package, delivering 1MHz gain-bandwidth, 3.5V/µs slew rate, ±1.5mV max input offset voltage, and 5pA typical input bias current. It operates from ±2.25V to ±18V supplies and supports high-side sensing due to rail-to-rail input common-mode range extending to V+.

For engineers reviewing the OPA2137UA datasheet, OPA2137UA pinout, OPA2137UA application, or OPA2137UA equivalent, key selection considerations include its low quiescent current (220µA/channel), wide supply range, input-to-V+ capability, and guaranteed performance over –40°C to +85°C - critical for precision battery-powered and industrial signal conditioning designs.

Technical Context

The OPA2137UA integrates two fully independent FET-input amplifier channels in a single SO-8 package, eliminating crosstalk and enabling robust operation even when one channel is overdriven or shorted. Its JFET input stage ensures ultra-low input bias current (5pA typ) and high input impedance (10¹² Ω || 2pF), making it suitable for high-impedance sensor interfaces.

It features unity-gain stability, no phase inversion on input overdrive, and maintains linearity up to output swing limits. The device supports both dual-supply (±2.25V to ±18V) and single-supply (+4.5V to +36V) configurations, with input common-mode voltage ranging from (V–)+3V to V+, enabling direct high-side current sensing without level-shifting circuitry.

Key Specifications

Pinout & Package

OPA2137UA is housed in an 8-pin SOIC (SO-8) surface-mount package (Package Drawing D), with standard 1.27mm pitch and JEDEC MS-012AC footprint. Thermal resistance θ_JA = 150°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL072CDR, OPA2137UA delivers 6× lower input bias current and rail-to-rail input capability - essential for high-Z sensors; versus OPA2140AIDR, it trades DC precision for 6.8× lower quiescent current, enabling true low-power dual-channel operation.

Availability

OPA2137UA is available at Aetrix Electronics and suitable for strain gage amplifiers, photodetector interfaces, precision integrators, battery-powered instruments, and active filters requiring stable component supply across industrial temperature ranges.

Supply support for OPA2137UA 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The OPA2137UA belongs to TI's MicroAmplifier™ series of precision op amps, designed specifically for low-cost, miniature, low-power applications demanding FET-input performance - including portable instrumentation, sensor signal chains, and space-constrained industrial modules.

FAQ

What is the maximum operating temperature range for the OPA2137UA?

The OPA2137UA is specified over –40°C to +85°C for full parameter compliance, with extended operation possible from –55°C to +125°C. Junction temperature must not exceed +150°C. This makes OPA2137UA suitable for industrial environments where ambient temperatures may fluctuate significantly, while maintaining guaranteed offset voltage, gain, and noise performance within the specified range.

Does the OPA2137UA support single-supply operation?

Yes, the OPA2137UA supports single-supply operation from +4.5V to +36V. Its input common-mode voltage range extends to the positive rail (V+), enabling high-side sensing without level-shifting. For proper linear operation at low supplies (e.g., +5V), inputs must remain ≥ (V–)+3V - so with V– = 0V, inputs must stay ≥3V, requiring appropriate biasing for AC-coupled or ground-referenced signals.

Can the OPA2137UA drive capacitive loads without instability?

The OPA2137UA is rated for direct capacitive load drive up to 1000pF while maintaining stability and specified settling time. For loads >100pF, layout best practices (short traces, local bypassing with 10nF ceramic caps at V+/V– pins) are recommended. The device's unity-gain stability and internal compensation eliminate need for external isolation resistors in most sensor interface applications.

What is the input protection scheme on the OPA2137UA?

The OPA2137UA features internal ESD diodes clamping inputs to V+ and V– rails. Input current must be limited to ≤2mA if voltage exceeds either rail by >500mV - typically achieved using a series resistor (e.g., 1kΩ). Exceeding this limit risks unpredictable behavior in adjacent amplifier channels or permanent damage, especially critical in dual-channel configurations where one input may be overdriven while the other remains active.

How does the OPA2137UA compare to the single-channel OPA137 in terms of specifications?

The OPA2137UA shares identical electrical specifications with the OPA137 (same offset voltage, bias current, GBW, slew rate, noise, and supply range) - ensuring design reuse across single/dual variants. Both are specified from –40°C to +85°C and offer identical FET-input performance. The only differences are packaging (SO-8 dual vs. SOT-23-5/SO-8 single) and channel count; no performance trade-offs exist between OPA137 and OPA2137UA for matched conditions.