Just fell over this looking for something else: A ready-made cascode 
transistor, like the discrete ones I used in my exam project 25 years ago. 
Now, where can I get some Oil to put it in?:)

http://www.st.com/stonline/products/literature/ds/12919/stc03de220hv.pdf

On Nov 26, 1:34=A0am, "Frithiof Jensen"
<frithiof.jen...@diespammerdie.jensen.tdcadsl.dk> wrote:
> Just fell over this looking for something else: A ready-made cascode
> transistor, like the discrete ones I used in my exam project 25 years ago=
.
> Now, where can I get some Oil to put it in?:)
>
> http://www.st.com/stonline/products/literature/ds/12919/stc03de220hv.pdf

They are suggesting it for switching use.  I wonder how it would do
running in linear mode at several mA.

It would also be nice if they put some extra clearance between those
pins.

Frithiof Jensen wrote:

> Just fell over this looking for something else: A ready-made cascode 
> transistor, like the discrete ones I used in my exam project 25 years 
> ago. Now, where can I get some Oil to put it in?:)
> 
> http://www.st.com/stonline/products/literature/ds/12919/stc03de220hv.pdf
> 
> 
   Seems to me that one must be rather careful with the driving 
circuitry, to control reverse base biasing - wich can kill the beta...

On Thu, 27 Nov 2008 00:36:04 -0800, Robert Baer
<r...@localnet.com> wrote:

>Frithiof Jensen wrote:
>
>> Just fell over this looking for something else: A ready-made cascode 
>> transistor, like the discrete ones I used in my exam project 25 years 
>> ago. Now, where can I get some Oil to put it in?:)
>> 
>> http://www.st.com/stonline/products/literature/ds/12919/stc03de220hv.pdf
>> 
>> 
>   Seems to me that one must be rather careful with the driving 
>circuitry, to control reverse base biasing - wich can kill the beta...

In actual fact, the mosfet emitter switch EBjn is expected to
avalanche on turn-off and large gains (>4) should not be expected,
regardless of 'typ' specs. The characteristics are stable.

I'd not seen anything above 1500V in this series before.

They've done a fair job with the package and pin-out, to anticpate the
increased functional creepage distances on printed wiring and on the
body.

RL