I use some larger ones, I can find them on Amazon for maybe $1.50 each. These are much smaller, now I have to order some, and redraw my PCB to mount them on... The bigger ones use the same chip, no heat sink, so good luck getting 3A out of those, although they do have some copper area under the chip since the boards are much bigger. They also claim up to 40VDC input - yeah, not so much, the cap connected directly across the input has a 25V rating. But that's fine., I'm using them as local stepdowns from a 12-15V power bus (most likely going to be 15 - so I can run 12V devices as well).