Hahaha! Well, if I’m willing to wait a few days (and find something else(s) to get up to free shipping), I just found:
I’ll never need to buy silicon diodes in this power range again!
I’m looking at voltage regulators and / or constant current sources for some automotive projects, so, getting up to the free shipping may not be too tough.
I’m still curious what the general engineering rule of thumb is...
I don’t breadboard much any more, but I usually double the expected rating.
I have a warehouse full of components, but usually can’t find what I’m looking for. Recently, I ordered 100 10k resistors and 2N3904 switches, only to find hundreds on a shelf about a week after the new one arrived.
Maybe you should walk around my shop and just pick up what you need...