Transistor bc 557 PNP switch

Description

Transistor bc 557,is a general purpose PNP transistor and Is the most used PNP bipolar junction used as an amplifier or switch in circuits.

The BC547-9 series and BC557-9 series are functionally identical to the common BC107-9 series.

All have a maximum power dissipation of 500mW.

They have essentially similar specifications and can generally be substituted for one another (within the PNP and NPN groups of three each).

BC557 Transistor Explained / Description:

This transistor  is  widely used PNP bipolar junction transistor manufactured in small TO-92 package.

which is a general purpose PNP transistor that can be used as a switch or amplifier in electronic circuits.

Its HFE ratings are 125 to 800 which makes it an ideal transistor to use as a small signal amplifier in electronic circuits for example for audio signal amplification or other, the HFE ratings of BC557 can be determined by the last letter after its number for example BC557A HFE ratings are 110-220, BC557B HFE ratings are 200-450 and BC557C HFE ratings are 420-800.

The max collector dissipation is 500 milliwatt which is also an another good point to use it in amplification stages. Moreover it will also perform well when used it as a switch for load under 100mA. The transistor has also good collector to emitter (VCE) value that is -45V, therefore you can easily use it in circuits using 40 to 45 volts DC.

• DESCRIPTION