Could any one be so kind to explain to me what are the zero ohm resistors and what are they used for? Thanks!
- posted
17 years ago
Could any one be so kind to explain to me what are the zero ohm resistors and what are they used for? Thanks!
Soldered jumpers.
Jon
Convenience.
You could use wire links too but not all auto-insert machinery is set up to do this.
On the SMD level a zerohm link is the only option.
Widely used to avoid requiring a 2 layer pcb.
Graham
I use them for "I might need a resistor here". For example, in one of my current designs I've got four 0603 footprints forming a "plus" on each I/O port (the wires run across the house, lots of EMI issues, etc) - one from the driver to the common point, one from power to the common point, one from ground, one from the common point ot the terminal block. That way, I can wire it up for whatever type of filter (RC, termination, 1wire pullup, etc) I need. Zero ohm resistors would be used when no resistance was needed.
VCC | [ ] [ ] | driver ----[] []---+---[] []---- terminal | [ ] [ ] | GND
You can also use them to disconnect parts of the circuit from each other, either for debugging or for alternate designs. Sort of a hard-wired SPST or SPDT switch.
Super conductors for situations when you need infinite current but only have a few volts available ;)
Only in really crappy designs. OTOH, you rarely see a decent design on a single sided PC board.
-- Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it.
They have a number of good uses:
-- Service to my country? Been there, Done that, and I\'ve got my DD214 to prove it.
It's just a jumper. The thing is, a little piece of wire won't fit in the claw of a pick-and-place machine. They don't want to assemble by hand, so the wire gets a little epoxy jacket to make it fatter.
-- Reply in group, but if emailing add another zero, and remove the last word.
to replace the solder blob, hope I speel it correct :)
jumpers?
-- Real Programmers Do things like this. http://webpages.charter.net/jamie_5
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.