BC547 Transistor Features
Bi-Polar NPN Transistor
DC Current Gain (hFE) is 800 maximum
Continuous Collector current (IC) is 100mA
Emitter Base Voltage (VBE) is 6V
Base Current(IB) is 5mA maximum
Available in To-92 Package

Brief Description on BC547
BC547 transistor has a gain value of 110 to 800, this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 100mA, hence we cannot connect loads that consume more than 100mA using this transistor. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA.

When this transistor is fully biased then it can allow a maximum 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 respectively. When base current is removed the transistor becomes fully off, this stage is called as the Cut-off Region and the Base Emitter voltage could be around 660 mV.