Transistor are a type of electronic switch used for controlling the flow of a circuit and amplifying signals. They have three legs: the base, the collector, and the emitter. NPN: When a voltage is applied to the base leg of the transistor it allows current to flow from the collector to the emitter. This means you can control a higher current path using logic level signals from a device like a micro-controller. PNP: When a voltage is applied to the base leg of the transistor it prevents current from flowing from the collector to the emitter. Type NPN Part No. PN2222ARLRPG Case or Package Type TO-92-3(TO-226) Maximum DC Collector Current: 0.6 A Collector- Base Voltage VCBO: 75 V Collector- Emitter Voltage VCEO Max: 40 V Emitter- Base Voltage VEBO: 6 V Gain Bandwidth Product fT: 300 MHz Collector-Emitter Saturation Voltage: 1 V DC Collector/Base Gain hFE Min: 35 Mounting Type Through Hole Maximum Power Dissipation: 625 mW Datasheet Datasheet Type PNP Part No. BD140 Case or Package Type SOT32 Collector Current 1.5 A Collector-Emitter V(br) 80 V Collector-Emitter V(sat) 500 mV DC Current Gain (hFE) 40 Mounting Type Through Hole Power 1.25W Datasheet Datasheet
