INA821IDGKT – TEXAS INSTRUMENTS

The Texas Instruments INA821IDGKT is a precision, low-power, current-feedback instrumentation amplifier packaged in a small 8-pin SOIC (D) surface-mount package. It boasts a typical input offset voltage of only 25µV, enabling high-accuracy signal amplification even in low-level applications. Operating from a ±2.25V to ±18V supply voltage range, the INA821IDGKT offers significant flexibility in system design. Its high common-mode rejection ratio (CMRR) of typically 100dB minimizes the influence of common-mode noise, crucial for accurate signal acquisition in noisy environments. The device features a unity-gain bandwidth of 1.5MHz and a low input bias current of 20nA, contributing to excellent signal fidelity and minimizing input offset error drift. Common use cases include precision bridge amplifier applications, sensor signal conditioning (e.g., thermocouples, strain gauges), and high-impedance signal buffering where low noise and high accuracy are paramount. The INA821IDGKT’s low power consumption and small footprint make it ideal for portable and space-constrained designs, while its current-feedback architecture simplifies circuit design and improves stability compared to voltage-feedback counterparts. Its wide supply voltage range and low offset voltage provide excellent performance across a broad spectrum of applications.