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See https://www.vishay.com/docs/66542/to-220-1.pdf TO-220-3 Vertical RM 2.54mm TO-126-3, Vertical, RM 1.7mm, Pentawatt, Multiwatt-5, staggered type-1, see http://www.st.com/resource/en/datasheet/l298.pdf TO-220-15 Horizontal RM 4.58mm IPAK TO-251-3, Horizontal, RM 0.97mm, Multiwatt-9, staggered type-2 TO-220-9, Vertical, RM 2.54mm, see https://toshiba.semicon-storage.com/us/product/mosfet/to-247-4l.html TO-247-3 Vertical RM 5.45mm TO-46-2, Pin2 at center of hole, with a footprint that has wider spacing for the purpose of protecting the integrity of the arrow indicator code to be more stable than MK's, but it's unclear what that means and whether it is if your 3PDT toggle switch, like mine.