BC 327 Transistor
The BC 327 Transistor that can be used for switching and amplification purposes in electronic circuits.
It can be used as a switch to drive loads up to 800mA, including high power relays, high power transistors, high power LEDs, ICs, etc.
BC327 is a general purpose PNP Transistor, the base of which needs to be connected to the ground, to turn on the transistor.
This transistor is available in various versions and is manufactured by many different companies, that’s why, the gain of the transistor may vary depending upon the version of the transistor. So, it’s recommended to check out the datasheet of the device before proceeding with the application and the datasheet for this specific transistor can be found on the bottom of the page.
When the transistor is turned off, we can see a positive voltage on the transistor’s base, if we measure the voltage between the base and the emitter.
Based on the characteristics of the transistor, a minimum amount of current needs to flow out of the base to turn the transistor on and that is when a positive voltage appears on the base, leakage current starts to flow from the base to the ground.
The characteristic curve below shows that a minimum of -10mA current needs to flow through the base to flow -300mA of collector current.
The below diagram shows the correlation between base current and collector current.