Texas Instruments OPA337NA/250

Overview

OPA337NA/250 from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier in SOT23-5 package, designed for low-power, space-constrained applications. It delivers 3MHz gain-bandwidth, 1.2V/µs slew rate, 120dB open-loop gain, ±3mV input offset voltage (max), and operates from 2.5V to 5.5V single supply with only 525µA quiescent current per amplifier - ideal for battery-powered instrumentation and photodiode pre-amplification.

For engineers reviewing the OPA337NA/250 datasheet, OPA337NA/250 pinout, OPA337NA/250 application, or OPA337NA/250 equivalent, key selection criteria include unity-gain stability, FET-input bias current ≤10pA, rail-to-rail output swing within 125mV of rails (RL = 25kΩ), input common-mode range extending to ground, and compatibility with 2.5V–5.5V single-supply systems requiring precision analog signal conditioning.

Technical Context

The OPA337NA/250 implements a unity-gain stable CMOS op amp architecture optimized for low-voltage, low-quiescent-current operation. Its input stage uses FET transistors to achieve ≤10pA input bias current and rail-inclusive common-mode range (−0.2V to V+ − 1.2V), enabling direct interfacing with grounded sensors and ADC reference points.

Internally compensated for G = 1 stability, it maintains 3MHz bandwidth and 1.2V/µs slew rate across its full 2.5V–5.5V supply range while delivering 120dB open-loop gain and 74dB CMRR over −40°C to +85°C. Output swing is specified to within 125mV of each rail under 25kΩ load, supporting true single-supply signal chain design.

Key Specifications

Pinout & Package

SOT23-5 surface-mount package (Package Designator: DBV), 2.9mm × 1.6mm footprint, 1.0mm height, moisture sensitivity level (MSL) 1, peak reflow 260°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA337NA/250, OPA340NA/250 trades 225µA higher quiescent current for 5MHz additional bandwidth, while MCP6001T-E/OT reduces IQ by 425µA at the cost of 2MHz less gain-bandwidth - enabling precise trade-offs between speed and battery life in portable analog front-ends.

Availability

OPA337NA/250 is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode pre-amplifiers, and medical instrumentation requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for OPA337NA/250 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 specializing in analog and embedded processing technologies, with leadership in precision op amps, data converters, and power management ICs.

The OPA337 series belongs to TI's MicroAmplifier™ portfolio, engineered specifically for miniature, low-voltage, low-power applications where space, energy efficiency, and rail-to-rail signal fidelity are critical - such as portable test gear and wearable health monitors.

FAQ

What is the maximum operating supply voltage for the OPA337NA/250?

The OPA337NA/250 has an absolute maximum supply voltage rating of 7.5V, but its specified operating range is 2.5V to 5.5V. Operation outside this range may cause parametric degradation or reliability issues. For reliable performance in production designs, the OPA337NA/250 must be used within 2.5V–5.5V, with 5V being the typical test condition for datasheet specifications.

Is the OPA337NA/250 unity-gain stable?

Yes, the OPA337NA/250 is explicitly unity-gain stable per its datasheet and internal compensation design. It does not require external compensation components when configured as a buffer (G = 1) or in any closed-loop gain ≥1. This distinguishes it from the OPA338 family, which requires minimum gain ≥5 for stability - making the OPA337NA/250 ideal for simple, robust buffer and gain-of-one applications.

What is the input common-mode voltage range of the OPA337NA/250?

The OPA337NA/250 features an input common-mode voltage range from (V−) − 0.2V to (V+) − 1.2V, which includes ground when V− is connected to 0V. This allows direct interfacing with grounded sensors and single-supply ADC references. The absolute maximum input voltage is (V−) − 0.5V to (V+) + 0.5V, but operation beyond the common-mode range risks increased input bias current and potential phase inversion if unprotected.

Can the OPA337NA/250 drive capacitive loads?

The OPA337NA/250 can drive moderate capacitive loads, but its ability depends on load value and closed-loop gain. Datasheet typical curves show increasing overshoot with load capacitance above 100pF at G = ±1. For reliable stability with >100pF loads (e.g., ADC input capacitance), a small series resistor (10–50Ω) between the OPA337NA/250 output and the capacitor is recommended to isolate the reactive load and preserve phase margin.

What is the thermal resistance (θ_JA) of the OPA337NA/250 package?

The OPA337NA/250 is packaged in SOT23-5 (DBV), which has a junction-to-ambient thermal resistance (θ_JA) of 200°C/W under standard JEDEC PCB mounting conditions. This value assumes minimal copper pour; adding thermal vias and copper planes beneath the pad can reduce effective θ_JA by 30–50%. At 525µA quiescent current and 5V supply, power dissipation is ~2.6mW, resulting in <0.6°C junction rise above ambient - well within safe operating limits.