How to Calculate the Collector Current, Ic, of a Transistor

Collector Current, Ic, of a transistor

The collector current, Ic, of a transistor is the amplified output current of a bipolar junction transistor.

There are several ways to find the collector current, Ic, of a transistor. And it all depends on what information is already known about the transistor:

1st Way to Calculate Collector Current Ic


Using Known Values

If the base current, Ib, and β are known, then Ic can be computed by the following formula:


collector current Ic of a transistor

Example
If Ib=35μa and β=100, then Ic calculates out to be:

Example calculating collector current Ic from beta and base current Ib

2nd Way to Calculate Collector Current Ic


Using Known Values

If the emitter current, Ie, and β are known, then Ic can be computed by the following formula:


Ic formula with Ie

Example
If Ie=4ma and β=150, then the value of Ic is computed to be:

Example of solving for collector current Ic with Ie and beta

3rd Way to Calculate Collector Current Ic


Using Known Values
If base current, Ib, and emitter current, Ie, are known, then Ic can be calculated by the formula:

formula for calculating collector current Ic using emitter current Ie and base current Ib

Example
If Ie=4ma and Ib=30μa, then Ic calculates out to be:

Example of calculating collector current Ic from emitter current Ie and base current Ib


Related Resources

How to Calculate the Base Current IB of a BJT Transistor

How to Calculate the Emitter Current IF of a BJT Transistor

How to Calculate β of a BJT Transistor

How to Calculate α of a BJT Transistor

How to Calculate VBB of a BJT Transistor

How to Calculate VCE of a BJT Transistor

How to Calculate Vπ of a BJT Transistor

How to Calculate Rπ of a BJT Transistor

How to Calculate GmVπ of a BJT Transistor Circuit

How to Calculate GM of a BJT Transistor



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