Texas Instruments OPA2137E/2K5

Overview

OPA2137E/2K5 from Texas Instruments (formerly Burr-Brown) is a dual FET-input operational amplifier in MSOP-8 package, designed for low-cost, low-power precision signal conditioning. It delivers 5pA input bias current, ±1.5mV max input offset voltage, 1MHz gain-bandwidth, 3.5V/µs slew rate, and operates from ±2.25V to ±18V supplies - ideal for battery-powered instrumentation and photodetector amplifiers.

For engineers reviewing the OPA2137E/2K5 datasheet, OPA2137E/2K5 pinout, OPA2137E/2K5 application, or OPA2137E/2K5 equivalent, key selection considerations include its rail-to-rail input capability (extends to V+), ultra-low quiescent current (220µA/channel), high CMRR (84dB), and independence between channels for low crosstalk in dual-sensor systems.

Technical Context

The OPA2137E/2K5 integrates two fully independent FET-input op amps with identical specifications across temperature (–40°C to +85°C). Its input stage supports common-mode voltages up to the positive supply rail, eliminating need for level-shifting in single-supply sensor interfaces.

Each amplifier features unity-gain stability, 94dB open-loop gain, and robust ESD protection with diode-clamped inputs. Channel separation exceeds 120dB at 1kHz, ensuring minimal interaction in dual-channel configurations like differential transimpedance or matched filter banks.

Key Specifications

Pinout & Package

OPA2137E/2K5 is packaged in an 8-pin MSOP (VSSOP-8, package drawing DGK), measuring 3.0mm × 3.0mm × 1.0mm with 0.5mm pitch. This miniature surface-mount package supports high-density PCB layouts while maintaining thermal resistance of 150°C/W (θ_JA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2137E/2K5, OPA2134UA/2K5 trades 20× lower input bias for 18× higher quiescent current and loss of rail-to-rail input capability, while TL072CDR offers lower cost but sacrifices 6× higher input bias and unguaranteed high-side input operation - making OPA2137E/2K5 optimal for low-power, high-impedance, single-supply precision analog front-ends.

Availability

OPA2137E/2K5 is available at Aetrix Electronics and suitable for battery-powered instruments, photodetector amplifiers, and precision integrators requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for OPA2137E/2K5 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 precision analog ICs, emphasizing high-performance, low-power, and application-specific signal conditioning solutions.

The OPA2137E/2K5 belongs to the MicroAmplifier™ series, engineered for miniature, low-cost, FET-input op amp applications demanding low input bias current, wide supply range, and rail-to-rail input capability in space-constrained systems.

FAQ

What is the maximum operating temperature range for the OPA2137E/2K5?

The OPA2137E/2K5 is specified over –40°C to +85°C for reliable operation, with extended functionality from –55°C to +125°C. Its MSOP-8 package has a junction temperature limit of +150°C, and thermal resistance θ_JA is 150°C/W - enabling use in industrial environments with adequate PCB copper pour. All key parameters including offset voltage, CMRR, and GBW are guaranteed across the full –40°C to +85°C range.

Does the OPA2137E/2K5 support single-supply operation?

Yes, the OPA2137E/2K5 supports single-supply operation from +4.5V to +36V. Its input common-mode voltage range extends to the positive rail (V+), allowing direct interfacing with high-side signals without level-shifting. For example, with a +5V supply, inputs can swing from (V–)+3V = 0V+3V = +3V up to +5V - making it suitable for 3.3V or 5V microcontroller-based sensor systems.

What is the pin compatibility between OPA2137E/2K5 and OPA2137U/2K5?

The OPA2137E/2K5 (MSOP-8) and OPA2137U/2K5 (SOIC-8) share identical pinout numbering and electrical specifications, but differ in physical package: MSOP-8 (3.0mm × 3.0mm) vs SOIC-8 (3.9mm × 4.9mm). They are not mechanically interchangeable - PCB layout must match the respective footprint (DGK vs D drawing). Both are RoHS-compliant and rated for –40°C to +85°C.

Can the OPA2137E/2K5 drive capacitive loads without oscillation?

Yes, the OPA2137E/2K5 is specified to drive up to 1000pF capacitive loads stably, per its datasheet. This capability supports direct connection to ADC input capacitors, long cables, or filters without external isolation resistors. For loads >100pF, TI recommends placing a small series resistor (e.g., 10–50Ω) between the output and capacitance to dampen potential peaking - verified in typical performance curves showing <10% overshoot at 1000pF.

How does the input bias current of OPA2137E/2K5 vary with temperature?

The input bias current of OPA2137E/2K5 increases with temperature, ranging from ~5pA at +25°C to ~100pA at +125°C, as shown in the "Input Bias Current vs Temperature" curve. At –40°C, it drops below 1pA. This variation is inherent to FET input stages and must be considered in high-impedance circuits (e.g., >10MΩ feedback networks), where even 100pA introduces ~1mV error at room temperature - well within its ±2.5mV max offset spec.