Texas Instruments’ INA381 amplifier ICs offer both a 26V common-mode, current-sensing amplifier and a high-speed comparator configured to detect over-current conditions. This is achieved by measuring the voltage developed across a current-shunt resistor and comparing that voltage to a defined threshold limit set by the comparator reference pin. Allowing for quick detection of over-current events, the standalone comparator alert response time is under 3µs. The total system over-current protection offered by these devices is less than 10µs. Available in 2mm x 2mm WSON-8 packages, they draw a maximum supply current of 350µA while operating from a single 2.7V to 5.5V supply.