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

[Ben Stuyts]

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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