an elementary question about transistors

[evilheart]

hi guys ,
i have an elementary question about transistor ,
how can i know the bandwidth of the transistor ?
in the data sheet i just found "transition frequency" which didn't have a MAX value , or it is just the inverse of the "storage delay time" tsd?

 

[digi001]

What is the part# of the transistor?

 

[KJ6EAD]

Rise time is not instantaneous in semiconductor materials which leads to phenomena described as various parameters such as switching speed, slew rate, bandwidth, gain bandwidth product (GBW), etc. This article includes a definition as used in amplifiers: Amplifier - Wikipedia, the free encyclopedia.

 

[digi001]

Looking at the first datasheet to show up on digikey search for BJT transistor.....

On this datasheet I see a chart labeled 'Current Gain vs Frequency' . This is where you can get your bandwidth spec which is defined as the -3db point.