TSM109ID is a 300mA low-dropout linear regulator from STMicroelectronics, designed for low-power, portable applications. It features an extremely low quiescent current of 0.2µA, high power supply rejection, low noise and fast transient response, no external components, and provides multiple protection features. The device is also available with an adjustable output option, enabling a broad output voltage range. The package is an 8-pin DIP or SOP.