0603 package used instead of a jumper wire?

[Falcon69]

I am running into a problem with a circuit I am working on.  Things are just way to tight on this board. Is it okay to use an 0603 instead of a jumper wire?  I don't have space underneath to connect the ground plane of two connected vias that are connected to a component on the top layer. But, I may be able to run a 0603 across a trace on the top plane, then connect it to the ground of another component to connect that ground plane.

I found some 0ohm resistors, would those work as a jumper?

[Pedram]

yes it works. but not for high frequency signals or very high impedance analog traces.

also note that they cannot handle much current.  ~1A typical.

[Simon]

I believe that that is exactly what 0 ohm resistors are for and for what they will cost much cheaper to implement as they can be assembled with the rest of the board in a pick and place machine instead of being hand soldered jumpers later.

[Falcon69]

OKay, sounds good.

I have two more traces to do, and the might just be the fix!

And yes, I know about the power rating.  0603 1/4 resistors should be fine.

Are you saying, because they are 0 ohm, they can actually handle around 1A?

[Chris_PL]

Are you saying, because they are 0 ohm, they can actually handle around 1A?

They can handle *only* around 1A, because they *are not 0 ohm* in reality (in fact, nothing is, but this is a topic for a PhD thesis). In terms of current handling and so on, a jumper wire with 0603 diameter will do better of course.

[Simon]

I don't know what they are made of but erm 0 ohm means no voltage drop so no power loss, of course they are not really 0 ohm and have a small resistance just like wire. 1A sounds right

[Falcon69]

cool, sounds easy enough.

thanks guys

[Monkeh]

Are you saying, because they are 0 ohm, they can actually handle around 1A?

They can handle *only* around 1A, because they *are not 0 ohm* in reality (in fact, nothing is, but this is a topic for a PhD thesis). In terms of current handling and so on, a jumper wire with 0603 diameter will do better of course.

Depends on the jumper. 'jumper' versions of standard resistors are a bit meh. Dedicated jumpers, well: http://rohmfs.rohm.com/en/products/databook/datasheet/passive/resistor/chip_resistor/pmr_jumper.pdf

[mikeselectricstuff]

Just make sure you use 1% ones 

[Falcon69]

good point. 

[w2aew]

Just make sure you use 1% ones 

LOL!

[ConKbot]

Just make sure you use 1% ones 

1%?  Cheapskate!

http://www.mouser.com/ProductDetail/Panasonic/ERJ-8GEY0R00V/?qs=sGAEpiMZZMvdGkrng054tw5%2fFYq5P%2fDo57ZeXVhw7gE%3d

0.05% or bust! 

[robrenz]

Mouser listing is wrong. The data sheet says 5% tolerance.

But what is 5% of 0?

A piece of 24ga solid copper .06 long is .000128 Ohms so 5% would be +/- .000006 Ohm

[Falcon69]

Is that basically what is inside those zero ohm resistors?  Just a piece of copper wire?

[T3sl4co1l]

No, they are manufactured with the same metallic paste as regular resistors, except it's put on thicker and, obviously, not laser trimmed to an exact value.  You can use them for small resistances if you want, but don't expect great tolerance.

Tim

[lilmantis]

I've seen these with up to 75-100 mOhms

[idpromnut]

If it's a layout issue (i.e. things are getting tight etc space-wise), this is typically a good time to stop and take a step back and ask yourself where the issue really is: perhaps the placement of your components on the board can be re-arranged to not have to use the jumpers (especially for a ground plane). If that doesn't work, go back and check your schematic for optimizations that you can make there which will help you lay out the board.

I'm sure others here can throw out a few words of wisdom in terms of tricks to use to help ease the layout step of a new design. Try to lay out the board without jumpers!