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

[Ben Stuyts]

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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