Texas Instruments OPA237UA/2K5G4

Overview

OPA237UA/2K5G4 from Texas Instruments is a single-channel, rail-to-rail output operational amplifier in SOIC-8 package, designed for low-power, single-supply operation from 2.7V to 36V. It delivers 750µV max input offset voltage (at VS = 5V), 1.5MHz gain-bandwidth product, and 350µA max quiescent current - enabling precision signal conditioning in space-constrained battery-powered instruments.

For engineers reviewing the OPA237UA/2K5G4 datasheet, OPA237UA/2K5G4 pinout, OPA237UA/2K5G4 application, or OPA237UA/2K5G4 equivalent, key selection criteria include its extended input common-mode range (to 0.2V below V–), 10mV ground-swing output capability, and stability with up to 10,000pF capacitive loads when sourcing current.

Technical Context

The OPA237UA/2K5G4 operates as a unity-gain stable voltage-feedback op amp with fully differential input stage and Class AB output stage. Its input stage supports common-mode voltages down to (V–) – 0.2V and up to (V+) – 1.5V, while the output swings within 10mV of V– and within 0.75V of V+ under 10kΩ load - critical for single-supply sensor interface and level-shifting applications.

It features low input bias current (–40nA max), high CMRR (86dB typ at 5V), and 28nV/√Hz input voltage noise density at 1kHz. Thermal performance is characterized by R_θJA = 180.4°C/W in SOIC-8, supporting operation across –40°C to +85°C ambient without derating at typical power levels.

Key Specifications

Pinout & Package

OPA237UA/2K5G4 is supplied in an 8-pin SOIC (D) package with standard JEDEC MS-012AC footprint (4.9mm × 3.9mm × 1.75mm). Pin 1 is marked with a beveled corner or dot; device orientation follows TI's standard top-view labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA333AIDBVR, OPA237UA/2K5G4 offers 2× higher bandwidth and 5× wider supply range but trades off microvolt-level drift performance; compared with LMV321IDBVR, it delivers 10× lower offset voltage and 40% lower quiescent current at equivalent cost in volume procurement.

Availability

OPA237UA/2K5G4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, PCMCIA cards, and industrial sensor signal conditioning requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA237UA/2K5G4 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The OPA237UA/2K5G4 belongs to TI's MicroAmplifier™ series - engineered specifically for space-constrained, low-power, single-supply applications including portable instrumentation and battery-operated sensors.

FAQ

What is the maximum supply voltage for OPA237UA/2K5G4?

The OPA237UA/2K5G4 supports a maximum supply voltage of 36V across V+ and V– terminals. This rating applies to both single-supply (e.g., V+ = 36V, V– = 0V) and dual-supply (e.g., V+ = ±18V) configurations. Exceeding 36V may cause permanent damage, as specified in the Absolute Maximum Ratings table of the official datasheet. The OPA237UA/2K5G4 maintains full functionality across the entire 2.7V to 36V range.

Does OPA237UA/2K5G4 support rail-to-rail input?

No, the OPA237UA/2K5G4 does not support rail-to-rail input. Its input common-mode voltage range extends from (V–) – 0.2V to (V+) – 1.5V. While this allows inputs slightly below V– (enabling true ground-referenced or sub-ground signals), it does not reach V+ - limiting high-side sensing without level shifting. The OPA237UA/2K5G4 output, however, swings to within 10mV of V– and 0.75V of V+, making it rail-to-rail on the low side only.

Can OPA237UA/2K5G4 drive a 10nF capacitive load stably?

Yes, the OPA237UA/2K5G4 is stable driving capacitive loads up to 10,000pF when sourcing current - far exceeding 10nF (10,000pF). Stability is guaranteed under these conditions without external compensation. When sinking current, stability is maintained up to 4,000pF. For loads >100pF, TI recommends verifying phase margin in the target circuit; the OPA237UA/2K5G4's unity-gain stability and robust internal compensation eliminate need for series isolation resistors in most cases.

What is the operating temperature range for OPA237UA/2K5G4?

The OPA237UA/2K5G4 is specified for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated across all electrical parameters in the datasheet, including input offset voltage, CMRR, and quiescent current. Thermal metrics such as R_θJA = 180.4°C/W (SOIC-8) confirm safe junction temperatures under typical PCB layouts and power dissipation. The OPA237UA/2K5G4 is not rated for extended temperature (–55°C to +125°C) operation.

Is OPA237UA/2K5G4 pin-compatible with other OPAx237 variants?

Yes, the OPA237UA/2K5G4 (SOIC-8) shares identical pinout with the OPA2237 dual version in SOIC-8 package for pins 1–4 and 7–8, but differs in channel count and internal connectivity. Pin 5 and Pin 6 are NC in OPA237UA/2K5G4, whereas OPA2237 uses them for Channel B inputs/outputs. Therefore, OPA237UA/2K5G4 is not a drop-in replacement for dual-channel versions, but its SOIC-8 footprint matches TI's standard 8-pin op amp layout, enabling board reuse with minor schematic updates.