Roman,

 Thanks.  Part numbers would be great.   Although this isn't
 for a TV, I thought of HO transistors when I was asked to find
 something.   I would appreciate some numbers though.

                                         Thanks and Regards,

                                                Jim



On Thu, 31 May 2001, Roman Black wrote:

>
> Jim Paul wrote:
> >
> > All,
> >
> > Does anyone have any ideas for high voltage transistors?  I need some with
> > a BVCEO of between 1200 and 3000 VDC.  I know this is quite an order, but
> > I don't see any way aorund it at this time.  If no transistors are available, some
> > high voltage op amps are available from APEX, but at $550.00 per amp, and I
> > need two, that gets quite expensive.  Anyway, if anyone has any ideas, let me
> > know.
>
>
> That spec is often seen in the TV industry, not
> common but available. Try some of the T0-3 types
> used in older Sanyo sets, 2500v/3000v 5A is common.
>
> Also, I have seen some TV manufacturers errata
> sheets that show these transistors can be replaced
> with more common (lower volt spec) types, usually
> with the addition of a simple snubber consisting of
> a 6kv ceramic and a resistor.
>
> I think the big problem is the slew rate, if you slow
> the change of voltage across the transistor, the
> higher voltage can be better tolerated. From memory,
> one errata sheet showed the 3000v transistor could be
> replaced by a much more common 2000v one simply by
> adding the snubber.
>
> Hope that helps, I you want part numbers I can check
> further. If you have a modern transistor book, look for
> all the transistors marked as "TV h-out" and you should
> find something. :o)
> -Roman
>
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jim@jpes.com

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