High-side current monitor with ±0.5% accuracy
The Texas Instruments INA219BIDR is a Zero-Drift series high-side current monitor that measures bidirectional current across a shunt resistor and outputs the result via an I²C-compatible interface (the datasheet covers the protocol details). Its ±0.5% accuracy over the full -40°C to 125°C industrial temperature range makes it a fit for precision power-rail monitoring in motor drives, telecom base stations, and battery-management systems. The input common-mode range extends from 0V to 26V, covering 12V and 24V rails with margin. The part is supplied in an 8-SOIC package for surface-mount assembly.
Accuracy and input range — what drives the BOM decision
The ±0.5% accuracy is the headline rating that distinguishes this part from lower-cost current-sense amplifiers. The 0V to 26V input range means the INA219BIDR can sit on a 24V bus without an external voltage divider, saving two resistors and a reference. The 10mA output current is the sink capability of the alert/comparator output, sized to drive an optocoupler LED or a logic input directly.