<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">I’m having fun asking these kind of things on ChatGPT 4o, so beware, the following is unverified :-)<div><br></div><div>“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.</div><div><br></div><div>### Recommended Options:</div><div>1. **Bergquist Sil-Pad 400**</div><div> - Breakdown Voltage: >4kV</div><div> - Thermal Conductivity: 1.1 W/m-K</div><div> - Operating Temperature: -60°C to +180°C</div><div> - No additional compound required</div><div><br></div><div>2. **3M 5590H**</div><div> - Breakdown Voltage: >5kV</div><div> - Thermal Conductivity: 3.0 W/m-K</div><div> - Operating Temperature: -60°C to +150°C</div><div> - Self-adhesive and no compound needed</div><div><br></div><div>3. **Keratherm Red T-441**</div><div> - Breakdown Voltage: >6kV</div><div> - Thermal Conductivity: 1.8 W/m-K</div><div> - Operating Temperature: -40°C to +200°C</div><div> - High electrical insulation and no compound required</div><div><br></div><div>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.”</div><div><br></div><div>Ben</div><div><br></div><div><div><br><blockquote type="cite"><div>On 29 Jan 2025, at 19:58, Jean-Pierre Desrochers via Synth-diy <synth-diy@synth-diy.org> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;">Need a TO220 thermo pad that can withstand 130vdc without arcing..<o:p></o:p></span></div><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;">I sillicon made type that does not need any compound would do best.<o:p></o:p></span></div><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;">No mica/compound stuff.<o:p></o:p></span></div><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;">I searched on Digikey and they have a lot available but nothing stated<br>about their voltage breakdown..<o:p></o:p></span></div><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;"><o:p> </o:p></span></div><div style="margin: 0cm; font-size: 12pt; font-family: Aptos, sans-serif;"><span style="font-size: 11pt; font-family: Calibri, sans-serif;">Any idea ?<o:p></o:p></span></div><div style="margin: 0cm; 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