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I'm designing an enclosure for a device with mains voltage power mosfet devices.

First I thought about using TO-220 MOSFETs, and mount them up against the aluminium enclosure. However, screwing them to the heat sink using the TO-220 package tab hole seemed unnecessarily difficult, what with the tab being conductive and all. So instead I opted to clamp them to the enclosure.

However, now that I'm thinking about it, if I'm not going to use the hole, why can't I just use a TO-262 package instead?

I googled a bit, but couldn't (in a few minutes) find an example of anyone using a TO-262 clamped to a heatsink.

Is there any reason not use a TO-262 vertically mounted, clamped to a heatsink/enclosure?

Edit: Forgot to say that I need the mounting to have at least basic isolation between all the TO-262 terminals and the enclosure/heat sink.

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    \$\begingroup\$ The tab on a TO-262 is just as conductive as the one on a TO-220. \$\endgroup\$ Sep 28, 2015 at 6:59
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    \$\begingroup\$ fyi: There are TO-220 mounting kits (also this) that take care of insulating the TO-220's tab from the heatsink. \$\endgroup\$ Sep 28, 2015 at 7:02
  • \$\begingroup\$ Yeah, I know about the mounting kits. I think they can't provide enough creepage distance for basic isolation. \$\endgroup\$
    – avl_sweden
    Sep 28, 2015 at 7:16
  • \$\begingroup\$ @NickAlexeev: You should probably read his previous question (electronics.stackexchange.com/questions/192375/…). Also, avl_sweden, you should probably add to this question that you want IEC-60950-1 conformity etc. Just functional isolation is easy to achieve. \$\endgroup\$ Sep 28, 2015 at 7:18
  • \$\begingroup\$ I'm beginning to think my quesiton might be a little silly. Of course you can mount the TO-262 against a heatsink. It's not magic. I'm just wondering if there might be some snag that I'm not aware of. \$\endgroup\$
    – avl_sweden
    Sep 28, 2015 at 7:22

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Is there any reason not use a TO-262 vertically mounted, clamped to a heatsink/enclosure?

Assuming you're not confusing TO-262 (aka I2PAK) with the much more common TO-263 (aka D2PAK or DDPAK), no there's no reason. In fact TO-262 is the vertical mount version, though-hole mount (unlike TO-263 which is surface), straight-leads.

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    \$\begingroup\$ Because of the relative obscurity of the package, it's a hard to find detailed mouning instructions/guidelines for TO-262. You should probably just refer to TO-220 clip mounting instructions... See this guide for example, where TO-262 at least gets a passing mention. \$\endgroup\$ Sep 28, 2015 at 8:13
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    \$\begingroup\$ @avl_sweden: also in Infineon AN 2012-10 it is said that plastic-bodied clips exist for HV mounting, but the image there is less than clarifying... \$\endgroup\$ Sep 28, 2015 at 8:38

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