Texas Instruments INA219BIDR Current Sense Amplifier, SOIC-8

The Texas Instruments INA219BIDR is a sophisticated, high-side, bi-directional current shunt and power monitor, designed for precision measurement with a zero-drift architecture. This device features an I²C- or SMBUS-compatible interface, enabling seamless integration into digital systems for real-time monitoring of shunt voltage drop and bus supply voltage. Its programmable conversion times and filtering allow for customisation based on application-specific noise and speed requirements.

A key advantage is its high accuracy, with programmable calibration and an internal multiplier that enables direct readouts of current in amperes, eliminating the need for complex external calculations. An additional multiplying register efficiently calculates power in watts, providing a complete power profiling solution. The interface supports 16 programmable addresses, facilitating the monitoring of multiple channels or devices on the same bus without address conflicts.

Key Specifications & Performance

The INA219 operates across a wide common-mode voltage range of 0 to 26V, making it suitable for various power rails. It requires only a single 3V to 5.5V supply, with a maximum supply current of 1mA, ensuring low power consumption. Critical performance metrics include a maximum gain error of 0.2%, a high common-mode rejection ratio (CMRR) of 120dB, and an accuracy of 0.5% maximum over its full operating temperature range.

Applications

This device is engineered for reliability in demanding environments, with an operating temperature range from -40°C to 125°C. It is presented in a compact, surface-mount SOIC-8 package, ideal for space-constrained PCB designs. As a green product free from antimony and bromine (Sb/Br), it meets modern environmental standards.

With its combination of high accuracy, flexible interface, and robust feature set, the INA219BIDR is an essential component for precise energy management