Electronics > Projects, Designs, and Technical Stuff
0603 Metric Imperial Confusion
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Pentoad:
Hello everyone, having a bit of confusion here.

I'm now ready to order some resistors and realised that there's a metric and imperial 0603 size. I don't know whether the resistors I have placed in my design are metric or imperial.

This is what they look like, the grid is 1mm.

MagicSmoker:
Center-to-center distance for Imperial 0603 is 1.6mm; yours looks like metric 0603. EDIT - err, maybe not. You just use much larger pads than I do.

The fact that there is both an Imperial and a metric 0603 in the first place is a rant all to itself.
jmw:
0603 = metric 1608 (1.6 x .8 mm). The distance between center of pads looks like around 1.5 mm so that's got to be an imperial 0603. Metric 0603 is 0201 - that's tiny! The part would fit on one of those pads with room to spare.
NivagSwerdna:
Whenever I get confused... I remember that I used to use 0805 and now I use 0603... and then I check https://en.wikipedia.org/wiki/File:SMT_sizes,_based_on_original_by_Zureks.svg and conclude that even though it is the year 2019... it is likely to be imperial.

If you measure it... and compare... http://www.resistorguide.com/resistor-sizes-and-packages/

As expected imperial.

And when I search Farnell for "0603 smd 1k" you end up finding..  "SMD Chip Resistor, 0603 [1608 Metric]" so for all intents and purposes it's probably worth only thinking in imperial sizes...

I wonder if there are people who think in metric?
Pentoad:
I use metric for nearly everything but in this case I had no idea what standard the component footprint was using as easyeda never specified. It makes sense now though, resistors ordered.
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