What do you call this jumper/connection on a PCB?

Community PCB Design
1

Hi guys. I want to isolate my power supplies (have two of them) so that they can be populated first and tested and then populate the rest of the board, and also connect an external power supply if required.

Normally I would just use a jumper for this (say between input voltage and the 5v regulator or 5v output and the 3.3v LDO). But I want to avoid the jumper.

I believe there is away to do this on PCBs, but don’t know the name. Something like two SMD resistor pads that get soldered over or opened up when you want to disconnect (would like to avoid a through hole wire “jumper”).

Sorry this is a bit lengthy, but anyone know the proper name for this type of layout/design?

Thanks!

2

These are called jumpers as well. Solder jumpers maybe?

Around here we just call them jumpers, they just aren’t through-hole.

3

You can get “zero ohm” SMT resistors which can be used as jumpers.

4

leon_heller:
You can get “zero ohm” SMT resistors which can be used as jumpers.

Thanks, I guess that is it. Meaning design in a regular 1206 resistor pad and then just use one of those resistors (or a solder bridge…)

Thanks

5

You aren’t ‘jumping’ over anything, so this would be a solder bridge

6

There are two ways do do this:

  • Use a 0-ohm resistor (or possibly a ferrite bead). Check the maximum current rating for the part first

  • Use two pads, usually shaped like two half-circles placed flat - flat, and jumper them with a blob of solder

If you plan to build this board using reflow or pick-and-place, I’d go for the first one.

/mike