• OPA2251UA SOIC-8


Dual, 15V single-supply, micro power operational amplifiers


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  • Part Number : OPA2251UA

  • Package/Case : SOIC-8

  • Brands : TI

  • Components Categories : Precision op amps (Vos<1mV)

  • Datesheet : OPA2251UA DataSheet (PDF)

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Overview of OPA2251UA

The OPA2251UA is a precision, low-power operational amplifier featuring high precision, low offset voltage, and low noise, making it ideal for a wide range of precision analog applications. This operational amplifier offers excellent performance in terms of accuracy and stability, suitable for instrumentation and sensor interface applications.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • OUT: Output
  • IN-: Inverting Input
  • IN+: Non-Inverting Input
  • V-: Negative Power Supply
  • V+: Positive Power Supply
  • NC: No Connection
  • NC: No Connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the OPA2251UA operational amplifier for a visual representation.

Key Features

  • Precision Performance: The OPA2251UA offers high precision with low offset voltage and low noise, ensuring accurate signal processing.
  • Low Power Consumption: This operational amplifier is designed for low power consumption, making it suitable for battery-powered applications.
  • Wide Supply Range: Operates from a wide supply voltage range, providing flexibility in various analog circuit designs.
  • Unity Gain Stable: Stable at unity gain configuration, allowing for convenient use in voltage follower applications.
  • Temperature Stability: Maintains stable performance over temperature variations, ensuring reliable operation in different environments.

Note: For detailed technical specifications, please refer to the OPA2251UA datasheet.


  • Instrumentation Amplifiers: Ideal for precision instrumentation amplifiers requiring high accuracy and stability.
  • Sensor Interfaces: Suitable for sensor interface circuits where precise signal conditioning is essential.
  • Data Acquisition Systems: Used in data acquisition systems for accurate signal processing and measurements.


The OPA2251UA is a precision operational amplifier that provides high accuracy, low noise, and stable performance, making it a reliable choice for precise analog applications.

Usage Guide

  • Power Supply: Connect the V+ (Pin 5) to the positive power supply and V- (Pin 4) to the negative power supply.
  • Input Signals: Apply the input signals to the non-inverting (IN+) and inverting (IN-) input pins for signal processing.
  • Output Connection: Connect the output (OUT) pin to the load or subsequent circuit for signal output.

Frequently Asked Questions

Q: What is the offset voltage of the OPA2251UA?
A: The OPA2251UA features an ultra-low offset voltage of typically 150µV, ensuring accurate signal amplification.

Q: Is the OPA2251UA suitable for temperature-sensitive applications?
A: Yes, the OPA2251UA offers temperature stability and low drift, making it suitable for temperature-sensitive applications that require precise signal processing.


For similar functionalities, consider these alternatives to the OPA2251UA:

  • OPA2151: A precision operational amplifier with similar characteristics to the OPA2251UA, offering high precision and low noise performance.
  • OPA2227: This is a dual operational amplifier from Texas Instruments, providing precision performance in a dual-channel configuration.



The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Number of channels 2 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36
Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Vos (offset voltage at 25°C) (max) (mV) 0.25
GBW (typ) (MHz) 0.035 Features High Cload Drive
Slew rate (typ) (V/µs) 0.01 Rail-to-rail In to V-, Out
Offset drift (typ) (µV/°C) 0.5 Iq per channel (typ) (mA) 0.027
Vn at 1 kHz (typ) (nV√Hz) 45 CMRR (typ) (dB) 124
Rating Catalog Operating temperature range (°C) -40 to 85
Input bias current (max) (pA) 20000 Iout (typ) (A) 0.05
Architecture Bipolar Input common mode headroom (to negative supply) (typ) (V) -0.2
Input common mode headroom (to positive supply) (typ) (V) -0.8 Output swing headroom (to negative supply) (typ) (V) 0.05
Output swing headroom (to positive supply) (typ) (V) -0.05

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