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

[Chromatest J. Pantsmaker]

Will Kapton tape work?

On Wed, Jan 29, 2025, 1:57 PM Ben Stuyts via Synth-diy <
synth-diy at synth-diy.org> wrote:

> And upon checking the Sil-Pad and pointing out that the specs were in
> error:
>
> "Apologies for any confusion in my earlier response. Upon reviewing the
> specifications for Bergquist Sil-Pad 400, here are the accurate details:
>
> Breakdown Voltage:
> 0.007-inch thickness: 3,500 VAC
> 0.009-inch thickness: 4,500 VAC
> Thermal Conductivity: 0.9 W/m-K
> Operating Temperature Range: -60°C to +180°C
> Given your requirement for a thermal pad that can withstand 130 VDC
> without arcing, the Sil-Pad 400's breakdown voltage ratings are more than
> sufficient. For instance, the 0.007-inch version can handle up to 3,500
> VAC, which is significantly higher than 130 VDC. Additionally, this
> silicone-based pad does not require any thermal compound, aligning well
> with your preferences.
>
> Therefore, Bergquist Sil-Pad 400 should be a suitable choice for your
> application.”
>
> Sigh…
>
> Ben
>
>
> On 29 Jan 2025, at 21:51, Ben Stuyts <ben at stuyts.nl> wrote:
>
> I’m having fun asking these kind of things on ChatGPT 4o, so beware, the
> following is unverified :-)
>
> “For a TO-220 package that needs to withstand 130VDC without arcing and
> without using mica or thermal compound, silicone-based thermal pads are an
> excellent choice. These pads provide electrical insulation while
> maintaining good thermal conductivity.
>
> ### Recommended Options:
> 1. **Bergquist Sil-Pad 400**
>    - Breakdown Voltage: >4kV
>    - Thermal Conductivity: 1.1 W/m-K
>    - Operating Temperature: -60°C to +180°C
>    - No additional compound required
>
> 2. **3M 5590H**
>    - Breakdown Voltage: >5kV
>    - Thermal Conductivity: 3.0 W/m-K
>    - Operating Temperature: -60°C to +150°C
>    - Self-adhesive and no compound needed
>
> 3. **Keratherm Red T-441**
>    - Breakdown Voltage: >6kV
>    - Thermal Conductivity: 1.8 W/m-K
>    - Operating Temperature: -40°C to +200°C
>    - High electrical insulation and no compound required
>
> These materials are widely available from electronics distributors like
> Digi-Key, Mouser, or RS Components. When choosing a thermal pad, ensure
> that it meets your thermal dissipation needs in addition to the voltage
> requirements.”
>
> Ben
>
>
> On 29 Jan 2025, at 19:58, Jean-Pierre Desrochers via Synth-diy <
> synth-diy at synth-diy.org> 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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>
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