INA121UA/2K5 – TEXAS INSTRUMENTS

The Texas Instruments INA121UA/2K5 is a precision, low-drift instrumentation amplifier packaged in a 8-lead SOIC (small outline integrated circuit) surface-mount format. It features a 2.5kΩ gain resistor network internally, providing a fixed gain of 10. This eliminates the need for external gain-setting resistors, simplifying design and reducing component count. The device operates from a ±15V to ±18V supply voltage range, though it can tolerate input voltages significantly exceeding the supply rails, provided the common-mode input voltage remains within the specified range._x000D_
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The INA121UA/2K5 boasts a low input bias current (typically 25nA), low input offset voltage (typically 25µV), and low drift characteristics (typically 0.2µV/°C), making it ideal for applications requiring high accuracy and stability. Its high common-mode rejection ratio (CMRR) exceeding 100dB minimizes the impact of common-mode noise. Typical use cases include precision bridge amplification in strain gauge measurements, thermocouple signal conditioning, and low-level signal amplification in industrial process control systems where high accuracy and stability are paramount. The fixed gain simplifies calibration and reduces design complexity compared to using externally configurable instrumentation amplifiers. The small SOIC package is suitable for high-density PCB designs.