RE: Tapped hole huh?

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Posted by Old nuff 2 no better (A) on September 5, 2014 at 20:08:09

In Reply to: RE: Tapped hole huh? posted by Tre' on September 5, 2014 at 19:12:45:

I assume conventional white thermal paste like Dow 340, not a silver filled paste for CPUs. Those pastes are no good for HV. It would be hard to imagine a Sil-Pad or mica leaking. If you have a burr, you'll have a direct short circuit. Never use grease with a Sil-Pad. I'd be very suspicious of the little top-hat washer that goes in the TO-220 hole. Those can be made of nylon or other stuff that absorbs water. Find a better/different washer or try using a Delrin screw. Also make sure you don't have some missed leakage path from the center lead of the package and not the tab at all.

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Follow Ups Full Thread

Topic - TO-220 tab leaking to heatsink? - jorisdallaire 08:48:28 09/05/14 (15)

Problem solved. - jorisdallaire 20:46:35 09/07/14 (0)

RE: TO-220 tab leaking to heatsink? - Tom Bavis 19:08:43 09/06/14 (0)

RE: Tapped hole huh? - Russ57 16:01:09 09/05/14 (9)

RE: Tapped hole huh? - jorisdallaire 17:18:03 09/05/14 (3)

RE: Because - Russ57 18:16:54 09/05/14 (2)

Interesting reading! - jorisdallaire 20:11:08 09/05/14 (1)

You're Not Wrong - Triode_Kingdom 23:37:34 09/05/14 (0)

RE: Tapped hole huh? - Tre' 16:24:51 09/05/14 (4)

RE: Tapped hole huh? - jorisdallaire 17:23:10 09/05/14 (3)

RE: Tapped hole huh? - Tre' 19:12:45 09/05/14 (2)

RE: Tapped hole huh? - Old nuff 2 no better 20:08:09 09/05/14 (1)

RE: Tapped hole huh? - Tre' 21:56:57 09/05/14 (0)

Use paste only with Mica - gusser 11:02:25 09/05/14 (1)

.... and ceramic isolator pads.-nt - Steve Jones 10:20:38 09/08/14 (0)

RE: TO-220 tab leaking to heatsink? - Triode_Kingdom 09:19:20 09/05/14 (0)

Follow Ups

RE: Tapped hole huh? - Old nuff 2 no better 20:08:09 09/05/14 (1)

RE: Tapped hole huh? - Tre' 21:56:57 09/05/14 (0)

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