INA139NA/3K – TEXAS INSTRUMENTS

The Texas Instruments INA139NA/3K is a precision, low-power, current-feedback instrumentation amplifier packaged in a 8-pin SOIC (small outline integrated circuit) surface-mount package. It features a low input bias current of typically 10nA, crucial for high-impedance sensing applications. Its wide common-mode input voltage range extends to ±20V, allowing operation with signals well beyond the typical ±15V supply rails. The gain is externally set via a single resistor, offering flexibility from 1 to 1000. The INA139NA/3K boasts a low input offset voltage of typically 25µV, minimizing errors in precise measurements. Its rail-to-rail output swing ensures full utilization of the available output voltage range. This device is ideal for applications requiring high accuracy and low noise, such as bridge amplifier circuits in strain gauge measurements, thermocouple signal conditioning, or precision current sensing with low-level signals. The low power consumption (typically 2.7mA) makes it suitable for battery-powered portable devices. The 3K suffix denotes a specific quality grade with tighter tolerances on parameters like input offset voltage and bias current compared to other INA139 variants. Its high common-mode rejection ratio (CMRR) further enhances its suitability for noisy environments.