4 ms·
>0 ohm resistors Had me scratching my head for a minute there. I guess it's a thing now, though we used to just call them jumpers.
by tyingq 4y ago
>0 ohm resistors
Had me scratching my head for a minute there. I guess it's a thing now, though we used to just call them jumpers.
- midoridensha 4y agoThey've been around for decades, both for thru-hole and surface-mount. When you're using automated machinery, you don't want to mess around with wire jumpers; a zero-ohm resistor can be inserted or pick-and-placed using the same automated equipment that normal resistors are placed with.
- tyingq 4y agoIt's just a funny name to me. Zero ohm and resistor are mutually exclusive. To me, it's still a jumper, shunt, etc.
- brians 4y agoAh, but the trick is to get the low tolerance ones. Two reasons: A) then it’s +/- 20%, right? Which means you bucket them and resell the + ones, using the rest to mine crypto, and B) you save money because 5% of 0 is no more than 20%.
- thayne 4y agoIt's also physically impossible for it to actually be 0 ohms. Unless there are consumer grade superconductors that I didn't know about.
- cvccvroomvroom 4y agoThat's why 0 Ω resistors have a current rating.
- cvccvroomvroom 4y agoThey're rarely just jumpers, they're often fuses as well because they have a current rating. 0 Ω are sometimes uses as sacrificial fail safes when there's not a cost budget for thermal self-resetting fuses such as those used in automotive applications. And it's usually cheaper to bridge two pads with a blob of solder than maintain and source another part in the BOM.
- tyingq 4y agoI suppose, though, if you look up those ratings, they aren't terribly different from the max current ratings of a copper wire with roughly the same cross-section area.
- benj111 4y agoWell a wire also has a current rating, I guess that's a fuse aswell?
- 83 4y ago"Fusible link wire" exists - it is sometimes used in automative wiring harnesses (mostly older vehicles I think).