> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Omega Software
> Sent: Saturday, February 21, 2004 7:31 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: A question about bipolar transistors
>
>
> Hello people,
>
> what happens to small signal NPN bipolar transistors (BC548C) if
> I apply to the base -12V and +12V, when the collector is always
> at +5V respect to the (grounded)emitter? Currents are small, few
> tens mA max.

You have violated the design specifications of the transistor in almost
every way.
It is not likely to survive long.
>
> Should I fear damage or bad behaviour? I need to use the
> transistor as a RTL (Resistor Transistor Logic) simple switch.

Why no design your interface correctly?
What are you trying to switch?

>
> Thanks!
> Andrea
>
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