BC558 PNP Transistor

Description

Pin Configuration Pin Number Pin Name Description 1 Collector Current flows in through collector 2 Base Controls the biasing of transistor 3 Emitter Current Drains out through emitter Features Bi-Polar PNP Amplifier Transistor DC Current Gain (hFE) is 800 maximum Continuous Collector current (IC) is 100mA Peak Collector current (Ic) is 200mA Emitter Base Voltage (VBE) is 5V Base Current(IB) is 200mA peak Available in To-92 Package Note: Complete Technical Details can be found in the BC558 datasheet given at the end of this page. BC558 Equivalents BC557, BC556 Alternative PNP Transistors BC157, BC556, 2N3906, 2SA1943, BD140, S8550, TIP127, TIP42 Brief Description on BC558 BC558 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. BC558 has a gain value of 110 to 800; this value determines the amplification capacity of the transistor. The peak current that could flow through the Collector pin is 200mA, this combined with the high gain value makes it an ideal choice for audio amplification applications. When this transistor is fully biased then it can allow continues current of 100mA to flow across the collector and emitter. This stage is called Saturation Region and the typical voltage allowed across the Collector-Emitter (V­CE) or Base-Emitter (VBE) could be 200 and 900 mV res