2n3393 transitor equivalent?

[neazoi]

what is the modern transitor equivalent of the 2n3393? if faster, even better.

 

[mister_rf]

To be used for?

Example BC337-25
https://www.fairchildsemi.com/ds/BC/BC337.pdf

 

[FvM]

if faster, even better

Do you have a speed specification for the original type? Or a target specification for the replacement?

 

[jpanhalt]

Mouser has 1,100 in stock at $.14 each.

John

 

[E-design]

Recommended replacements: BC168/183/238/548

As per Japanese International Transistor Comparison Tables - Tech Publications PTE.Ltd.

 

[FvM]

Recommended replacements: BC168/183/238/548

None of these has the 500 mA current rating to replace 2N3393. You better refer to the profound suggestion by mister_rf.

 

[neazoi]

It is to be used in an analogue oscilloscope vertical and horizontal amplifier sections and also trigger sections. If a faster transistor is to be used I MAY be able to make this a little bit faster oscilloscope than 5MHz.

 

[FvM]

In this case, you should check the actual voltage and current rating required by the respective circuit and try a suitable faster transistor. Speed is a matter of all circuit parameters, not only transistor fT and capacitances. Furthermore placing a high speed transistor in a circuit not prepared for it may bring up oscillations.

 

[mister_rf]

Follow the schematics posted here:
https://www.edaboard.com/threads/216574/
changing the 2N3393 transistor doesn’t help to much.

 

[FvM]

changing the 2N3393 transistor doesn’t help to much

I agree. The bandwidth limitation would be mainly located in the output amplifier that has to be possibly redesigned for a profound improvement. As a first step, you would want to get an overview of the present circuit's behaviour, either by a simulation, or even better, by a measurement.