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I am reading about creepage distance and clearance and came across a T0-247-3 SiC diode (IDW20G120C5B). This diode is rated for 1.2kV which would mean that it won't break down at let's say 800V, which is fine. But I checked the physical distance between the anode and cathode pin and it is 2.5 mm, which as per Pollution degree2 material group 4 (I chose this category as found most of sensors following this), can sustain only 250V. Isn't this contradictory? Or what am I missing

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This is not contradictory if you add some kind of compound to seal the legs.

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    \$\begingroup\$ Could you give an example of what you would put on the leads, and what requirements are needed to select the compound? \$\endgroup\$ – C_Elegans Sep 26 '18 at 19:45

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