[sdiy] Need a TO220 thermo pad that can withstand 130vdc without arcing..

[Jean-Pierre Desrochers]

The four actual TO220 packages are two power mosfets and two diodes
All on the same heatsink.
Both mosfets are fed with a +130VDC supply.
These are PWM pre drivers for a broken CROWN stereo power amp.
I know 130vdc is quite out of synth topics but I knew repairmen
Like you would know good thermo pads usages and insulation limits.


> -----Message d'origine-----
> De : rburnett at richieburnett.co.uk <rburnett at richieburnett.co.uk>
> Envoyé : 30 janvier 2025 13:22
> À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> Cc : synth-diy at synth-diy.org
> Objet : Re: [sdiy] Need a TO220 thermo pad that can withstand 130vdc
> without arcing..
> 
> Out of interest, what does the 130VDC represent JP?
> 
> That would be quite a high pitch note with a 1V/oct CV! ;-)))
> 
> -Richie,
> 
> 
> 
> On 2025-01-30 14:50, Jean-Pierre Desrochers via Synth-diy wrote:
> > In fact there I have a row of 4 x TO220 packages alligned on a shared
> > heatsink.
> >
> > The broken (arcing) thermo pad to replace is a one piece that sits
> > underneath the four TO220’s… Around 60mm x 20mm.
> >
> > After browsing following your nice comments I finally bought this :
> >
> > https://www.digikey.ca/en/products/detail/t-global-technology/TI900-20
> > -20-0-12-
> 0/3042329?s=N4IgTCBcDaIIxwGwA4C0AVAkgTgAy9TAKNVwDo4xTUA5AERA
> F
> > 0BfIA
> >
> > De : Synth-diy <synth-diy-bounces at synth-diy.org> De la part de René
> > Schmitz Envoyé : 30 janvier 2025 05:34 À : synth-diy at synth-diy.org
> > Objet : Re: [sdiy] Need a TO220 thermo pad that can withstand 130vdc
> > without arcing..
> >
> > Is the part in question available in TO-220 Full-PAK, i.e. a fully
> > insulated case?
> >
> > On 29.01.2025 19:58, Jean-Pierre Desrochers via Synth-diy wrote:
> >
> >> Need a TO220 thermo pad that can withstand 130vdc without arcing..
> >>
> >> I sillicon made type that does not need any compound would do best.
> >>
> >> No mica/compound stuff.
> >>
> >> I searched on Digikey and they have a lot available but nothing
> >> stated about their voltage breakdown..
> >>
> >> Any idea ?
> >>
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