The ACS781LLRTR-100B-T is a thermally enhanced SMD current sensor IC manufactured by Allegro. It is designed specifically for board mount applications with an efficient thermal solution. This small, low-power device features a wide dynamic range and a low offset voltage for optimum high-resolution current sensing. It also has high-side as well as low-side precision current sensing capabilities, with a temperature compensation feature to reduce the drift of its output signal over temperature. The ACS781LLRTR-100B-T supports both 3- and 5-V logic, allowing it to be used in a wide variety of applications, from ac/ dc home appliance control, solar panel string monitoring, and ac motor control, to industrial automation and many more. The device is fully protected, with an open drain fault flag output that indicates an overcurrent condition. The built-in fail-safe circuitry will shut down the device in the event of an overcurrent, and is designed to protect the system and the device against damage.