OPA251UA

Instrumentation, Op Amps, Buffer Amps Overview

The OPA251UA is a single-channel, MicroPower operational amplifier from the OPAx251 family, optimized for ±15V supply operation. It features a quiescent current of 27µA and operates within a wide supply range of 2.7V to 36V (single) or ±1.35V to ±18V (dual). The device provides rail-to-rail output swing, low input offset voltage of ±250µV max, high common-mode rejection ratio of 124dB, and high open-loop gain of 128dB. It includes external trim pins for offset adjustment and is unity-gain stable.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• MicroPower consumption with 27µA quiescent current per amplifier
• Rail-to-rail output capability extending within 50mV of supply rails
• High precision performance including 124dB common-mode rejection and 128dB open-loop gain
• External offset voltage trim connections available on pins 1 and 5

Instrumentation, Op Amps, Buffer Amps Applications

• Battery operated instruments
• Portable devices
• Medical instruments
• Test equipment

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific package variant against project requirements, as the OPAx251 series is available in SOIC and PDIP formats. Confirm that the design utilizes the ±15V optimization characteristics inherent to the OPAx251 family rather than the low-voltage OPAx241 series. Ensure proper handling precautions are observed due to the sensitivity of precision integrated circuits to electrostatic discharge during installation.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when designing for high-power supplies around ±15V while requiring ultra-low power consumption. The OPAx251 series offers laser-trimmed low offset voltage specifically at higher supply voltages compared to the OPAx241 series. Consider the availability of external trim pins if system-level offset nulling is required without relying solely on internal trimming capabilities.

Instrumentation, Op Amps, Buffer Amps Part Context

The OPA251UA belongs to the OPAx251 family, which is distinct from the OPAx241 series designed for 5V operation. Both families share similar electrical characteristics but differ in their laser-trimming targets. The OPAx251 series is specifically calibrated for optimal performance at ±15V, ensuring superior offset voltage and drift specifications under these conditions compared to operation at lower voltages.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

OPA241UA

Instrumentation, Op Amps, Buffer Amps FAQ

How does the OPAx251 series differ from the OPAx241 series?

The OPAx251 series is laser-trimmed for low offset voltage and drift at ±15V supply, whereas the OPAx241 series is trimmed for 5V supply. Both operate over the full voltage range but exhibit different initial offset performance based on their trim points.

What is the purpose of pins 1 and 5 on the OPA251UA?

Pins 1 and 5 provide external offset voltage adjustment connections. They allow users to null the op amp's offset voltage using an external potentiometer, though this adjustment may slightly degrade offset drift behavior.