Texas Instruments OPA2337UA

Overview

OPA2337UA from Texas Instruments is a dual, rail-to-rail output CMOS operational amplifier in SOIC-8 package, optimized for unity-gain stability, 3MHz gain-bandwidth, 1.2V/µs slew rate, and single-supply operation from 2.5V to 5.5V. It delivers 120dB open-loop gain, 10pA max input bias current, and 525µA per amplifier quiescent current-ideal for low-power photodiode pre-amplification and battery-powered instrumentation.

For engineers reviewing the OPA2337UA datasheet, OPA2337UA pinout, OPA2337UA application, or OPA2337UA equivalent, key selection considerations include its G = 1 stability, rail-to-rail output swing down to 40mV from rails (RL = 25kΩ), input common-mode range extending to ground, and compatibility with space-constrained, single-supply signal conditioning circuits requiring low input current and high DC precision.

Technical Context

The OPA2337UA implements a CMOS input stage enabling 10pA max input bias current and 10¹³Ω input impedance, paired with rail-to-rail output stage delivering ±125mV swing from supply rails under 25kΩ load. Its unity-gain stable architecture ensures unconditional stability without external compensation across all gains ≥1.

Designed for single-supply systems, it supports input common-mode voltage from −0.2V to (V+) − 1.2V and operates over −40°C to +85°C. The dual-channel topology features fully independent amplifiers with <0.3µV/V channel separation, eliminating crosstalk even under overload conditions.

Key Specifications

Pinout & Package

OPA2337UA is housed in an 8-pin SOIC (D) surface-mount package with standard 1.27mm pitch and JEDEC MS-012AC footprint. Thermal resistance θ_JA is 150°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual CMOS op amp applications.

Compared with OPA2337UA, OPA2340UA trades 2.5MHz extra bandwidth for +43% quiescent current, while MCP6022-I/SN reduces power by 56% but sacrifices 50dB open-loop gain and 20dB CMRR-making OPA2337UA optimal for precision, low-power, single-supply instrumentation where DC accuracy and noise immunity are critical.

Availability

OPA2337UA is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode pre-amplifiers, and medical sensor interfaces requiring stable component supply, long-lifecycle support, and SOIC-8 compatibility with existing production tooling.

Supply support for OPA2337UA 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 leader specializing in analog and embedded processing solutions, with decades of expertise in precision op amps and low-power signal chain components.

The OPA2337UA belongs to TI's MicroAmplifier™ series, engineered specifically for miniature, single-supply applications demanding rail-to-rail output, ultra-low input current, and unity-gain stability in space-constrained portable systems.

FAQ

What is the maximum operating temperature range for the OPA2337UA?

The OPA2337UA is specified for operation from −40°C to +85°C, with absolute maximum junction temperature rated at 150°C. Its thermal resistance θ_JA is 150°C/W in SOIC-8 package, allowing reliable performance in industrial and portable environments when properly heatsinked or airflow-cooled. This range matches standard commercial-grade requirements and supports deployment in medical and test equipment.

Is the OPA2337UA unity-gain stable, and what does that mean for circuit design?

Yes, the OPA2337UA is unity-gain stable, meaning it remains stable with closed-loop gain ≥1 without requiring external compensation components. This eliminates the need for feedback capacitors or gain-setting resistors beyond basic configuration, simplifying PCB layout and reducing BOM count. Engineers can confidently use OPA2337UA as a buffer, active filter, or sensor interface at G = 1 without risk of oscillation.

Can the OPA2337UA drive capacitive loads, and what is its recommended maximum?

The OPA2337UA can drive moderate capacitive loads up to 100pF while maintaining 0.1% settling in 2µs, as verified in typical characterization. For loads exceeding 100pF, isolation resistor (e.g., 10–50Ω) between output and capacitance is recommended to prevent peaking or instability. Driving larger capacitive loads like long cables or ADC input capacitance requires careful layout and may necessitate external compensation per TI Application Bulletin SBOS250.

Does the OPA2337UA support rail-to-rail input, or only rail-to-rail output?

The OPA2337UA provides rail-to-rail *output* swing but has a limited rail-to-rail *input* common-mode range: −0.2V to (V+) − 1.2V. While inputs extend to ground (enabling true single-supply operation), they do not reach the positive rail. This design avoids phase inversion and maintains high CMRR across the usable input range, making it ideal for ground-referenced sensors but unsuitable for direct V_CC-referenced differential inputs.

What is the typical input offset voltage and drift for the OPA2337UA?

The OPA2337UA has a typical input offset voltage of ±0.5mV (max ±3.5mV over temperature) and offset voltage drift of ±2µV/°C. Production distribution data shows >95% of units fall within ±2mV at room temperature. These values enable high-accuracy DC-coupled amplification in strain gauge bridges and thermopile interfaces where sub-mV errors must be minimized across temperature gradients.