what is the difference between transistors?

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bigfarmerdave

New Member

• Mar 17, 2009

• #1

What is the difference between a plain old transistor, like an 3904, and an RF transistor?

 

Sceadwian

Banned

• Mar 17, 2009

• #2

The geometry of the P and N junctions. I think they try to minimize junction capacitance to make it useful at RF frequencies, other than that I'm not exactly sure.

 

crutschow

Well-Known Member

Most Helpful Member

• Mar 17, 2009

• #3

RF transistors have lower capacitance and higher frequency response. They are optimized for amplifying high frequency analog signals and generally don't work well as switches.

 

Sceadwian

Banned

• Mar 17, 2009

• #4

The higher frequency response comes from the lower capacitance =)