# Junction capacitance for NPN transistor

Discussion in 'The Projects Forum' started by mghg13, Apr 13, 2014.

1. ### mghg13 Thread Starter Member

Jul 17, 2013
63
1
Hello,

I need some help concerning the design of simple CE amplifier.

I am using the BC107B NPN transistor and in order to determine the frequency response of the amplifier, I need to know the junction capacitances of the transistor, i.e. $C_{bc}$ , $C_{be}$ and $C_{ce}$

However the datasheets provide data only for $C_{bc}$ and $C_{be}$ .

How do I get the value for $C_{ce}$ ? Can I just calculate it as the capacitance obtained by the series connection of $C_{bc}$ and $C_{be}$ ?

Jun 22, 2012
6,488
1,026
3. ### mghg13 Thread Starter Member

Jul 17, 2013
63
1

but the capacitance value i need is for $C_{ce}$. Are they the same?