Problems with MicroView +5V and USB Programmer

Any recommendations for a common part#?

How much current will the diode have to handle?

Do you want through-hole or surface mount?

For around 500mA or less with through-hole, a 1N5817 would probably do.

For surface mount, you’d probably want to look at forward current capability, low forward voltage, size and cost.

Note that usually a diode with higher than required current capability will have a lower voltage drop at low currents. Look at the forward voltage graph in the datasheet.