2N3906 PNP Transistor

Description

Pin Configuration: Pin Number Pin Name Description 1 Emitter Current Drains out through emitter 2 Base Controls the biasing of transistor 3 Collector Current flows in through collector Features: Bi-Polar PNP Transistor DC Current Gain (hFE) is 300 maximum Continuous Collector current (IC) is 200mA Emitter Base Voltage (VBE) is 5V Base Current(IB) is 5mA maximum Collector Emitter Voltage (VCE) is 40V Collector Base Voltage (VCB) is 40V Available in To-92 Package Note: Complete Technical Details can be found at the 2N3906 datasheet given at the end of this page. 2N3906 Equivalent Transistors: 2N4403, MPSA13, MPSA92, MPSA55, ZTX555 Alternative for 2N3906: BC157, BC558, 2SA1943, BD140, S8550, TIP127, TIP42 Brief Description on 2N3906: 2N3906 is a PNP transistor hence the collector and emitter will be closed (Forward biased) when the base pin is held at ground and will be opened (Reverse biased) when a signal is provided to base pin. This is where a PNP transistor differs from a NPN transistor, a Logic state (blue colour) is used to toggle between Ground and Signal Voltage (Emitter-Base Voltage VBE) as shown below 2N3906 has a gain value of 110 to 300, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 200mA, hence we cannot connect loads that consume more than 200mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA