Introduction to BC546

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Hi everyone! Thank you for viewing this article, I welcome you on board. In this post I’ll walk you through the detailed Introduction to BC546 . BC546 is a low power NPN transistor mainly used for general purpose amplification and switching applications.
In this read you’ll study all nitty-gritty of BC546 transistor i.e. from pinout, pin configuration, and working principle to power ratings, key parameters, physical dimensions and applications. Keep reading.
Introduction to BC546

BC546 is a bipolar junction NPN transistor that finds applications in switching, amplification, impedance, H-bridge and current mirror circuits.
This transistor falls in silicon epitaxial planar transistor category which is generally divided into three groups A, B & C. This BC546 is available in group A & B.
BC546 low power transistor mainly contains three terminals named emitter, base and collector. And all these terminals are different in terms of their doping concentration and are used for external connection with electronic circuits.
BC546 transistor contains three layers i.e. two N-doped layers and one P-doped layer. The P-doped layer resides between two N-doped layers. Plus, it carries two PN junctions where one is forward biased and other is reverse biased.
Unlike FET (Field-Effect Transistor) that is voltage controlled device, BC546 is a current controlled device where small current at the base terminal is primarily used for controlling the large current at both emitter and collector terminals.

1. BC546 Datasheet

Although, we are going to discuss everything related to BC546, in this tutorial but still its always wise to have a look at the datasheet.
You can download BC546 Datasheet by clicking the below button:

Download BC546 Datasheet

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2. BC546 Pinout
BC546 carries three pins named


The collector voltage is much larger than the base voltage and emitter terminal is highly doped compared to base and collector terminals. When voltage is applied at the base terminals, it ignites the electron reaction between emitter and collector terminals.
3. BC546 Pin Configuration

Emitter current is a sum of both collector current & base current.
The small current at the base terminal is used to control large current at the emitter and collector terminals.
This transistor can be employed in three main configurations named:

Common base configuration.
Common emitter configuration.
Common collector configuration.

Common emitter configuration comes with exact voltage and current ratings required for amplification....