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Google search results imply TO-220FP to be full-pack case.
Wikipedia says that TO-220F is full-pack case.
Farnell categorizes TO-220F and TO-22FP differently.

I'm confused. What is the difference between these two TO-220 case versions?

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  • \$\begingroup\$ Did you check the datasheets for mechanical and thermal specification? \$\endgroup\$ – Vladimir Cravero Sep 9 '14 at 9:20
  • \$\begingroup\$ I have check datasheets of several components. They appear to be same. Both F and FP are isolated. Datasheets don't mention detailed information. \$\endgroup\$ – hkBattousai Sep 9 '14 at 9:23
  • \$\begingroup\$ Package codes often vary between manufacturers. You will have to study the datasheet of the parts you are interested in to find what that code means to that manufacturer. \$\endgroup\$ – Peter Bennett Sep 9 '14 at 16:03
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The STP12PF06 datasheet (first google hit for 'to-220p to-220fp') shows that the f version has a metal tab, and the fp version has only plastic on the outside (at least at the front, but I assume also on the back).

enter image description here

This makes it easier to mount the package galvanically isolated, but the plastic layer seems to add some thermal resistance: the rthj-case of the fp version is almost 3 C/W higher.

enter image description here

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  • 2
    \$\begingroup\$ I don't see an F version of STP12PF06 in the datasheet. \$\endgroup\$ – hkBattousai Sep 9 '14 at 10:19

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