:The S8550 is a bipolar transistor made by HXY MOS. It has a 25V 300mW 120@50mA, 1V 500mA PNP configuration, and is composed of three terminals: the Emitter, the Base, and the Collector. It is housed in a SOT-23 package and conforms to RoHS (Restriction of Hazardous Substances) standards. It is primarily used as a low power switch or amplifier. The PNP configuration of this transistor makes it ideal for use in low voltage analog or digital circuits.