BC557 General Purpose PNP Transistor

Description

BC557 is a PNP transistor. Used for amplification and switching purposes.  When used as a switch it is operated in the Saturation and Cut-Off Region. The transistor will act as an Open switch during Forward Bias and as a Closed switch during Reverse Bias. Therefore,  biasing can be achieved by supplying the required amount of current to the base pin.

When used as an Amplifier, the transistor operates in the Active Region. It amplifies power, voltage and current at 3 different configurations; Common emitter amplifier, Common collector amplifier or Common base amplifier.

Features of BC557

• It is a Bi-Polar PNP Transistor
• Has a DC Current Gain (h_FE) is 300 maximum
• Continuous Collector current (I_C) is 100 mA
• The Emitter Base Voltage (V_BE) of 6 V
• In addition, it has a maximum base Current (I_B) of 5 mA
• Lastly, it is available in To-92 Package

Applications

• Used as IC in Modules like Relays
• Also in LED driver
• In Amplifier modules
• used in Audio amplifiers,
• Last but not least, to amplify Signal
• It can act as Darlington pair

Datasheet

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