The 2N5400 is a PNP bipolar junction transistor (BJT) made by LUGUANG. It is a bit longer than other BJTs, often referred to as a 'Double-Barrel' BJT. It is commonly used as a pre-amplifier, signal switch, and linear amplifier. It has a collector-base breakdown voltage of 60V and can handle up to a 600mA collector current. Due to its high DC current gain (=100), fast switching speed, and rugged construction, the 2N5400 is well suited for high power applications.