1. Mouser shows several DO-35 zener diodes that are apparently able to
dissipate 5W. Is this really (safely) possible?

http://ca.mouser.com/Semiconductors/Discrete-Semiconductors/Zener-Diodes/_/=
N-6hpds?P=3D1z0z7uzZ1z0w7s7

2. Is mounting through hole power components vertically (like in the shape
of an up side down U) on the PCB better for thermal dissipation?


Sorry for duplicating the thread. Forgot to add tag.
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