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what is the difference between transistors?

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Sceadwian

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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

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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

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The higher frequency response comes from the lower capacitance =)
 
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