I've used standard nylon shoulder washers on TO-220 devices at over 1KV between tab and heatsink with no problem. The manufacturers specify breakdown voltage of mounting washers and heat sink pads but it is normally far higher than line voltage.
Brian.
it is usual to countersink the Al h-sink underneath the TO-220 to give even more creepage - the countersink bevel must be longer than 1.0 mm to count in the creepage path ( standards )
Another alternative is to use "steel clips" to fix the power device onto heat-sink.High voltage devices are generally fixed with this technique.
Most companies design their own wrap around spring steel clips for TO-220 in a "tube" of insulation ...
Do you have some Examples or links I can take a look at? If this is a common issue, it seems the part would be readily available.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?