Author Topic: 0603 Metric Imperial Confusion  (Read 3006 times)

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Offline PentoadTopic starter

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0603 Metric Imperial Confusion
« on: October 31, 2019, 07:42:16 pm »
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.

 

Offline MagicSmoker

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Re: 0603 Metric Imperial Confusion
« Reply #1 on: October 31, 2019, 07:51:13 pm »
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.
 
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Offline jmw

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Re: 0603 Metric Imperial Confusion
« Reply #2 on: October 31, 2019, 07:51:27 pm »
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.
 
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Offline NivagSwerdna

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Re: 0603 Metric Imperial Confusion
« Reply #3 on: October 31, 2019, 08:05:19 pm »
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?
« Last Edit: October 31, 2019, 08:13:52 pm by NivagSwerdna »
 
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Offline PentoadTopic starter

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Re: 0603 Metric Imperial Confusion
« Reply #4 on: October 31, 2019, 08:51:41 pm »
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.
 

Offline bson

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Re: 0603 Metric Imperial Confusion
« Reply #5 on: October 31, 2019, 08:56:36 pm »
I'd use imperial sizes down to 0201, then switch to metric and make sure to qualify it as such.  As far as I can tell this matches equipment manufacturers as well, at least based on what I've seen at Semicon West.
 

Offline I wanted a rude username

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Re: 0603 Metric Imperial Confusion
« Reply #6 on: October 31, 2019, 09:56:07 pm »
I wonder if there are people who think in metric?

I do (along with the rest of the PCB design unless doing pure through-hole for fun), and it's liberating. The metric sizes precisely encode the device size ... no conversion tables required. But when ordering passives, searching is more effective in imperial.
 
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Offline Lunasix

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Re: 0603 Metric Imperial Confusion
« Reply #7 on: October 31, 2019, 10:05:21 pm »
Some years ago, I ordered capacitors in 0603 size, but didn't seen it was 0603 metric (didn't know...) and received 0603 metric, which means 0201 imperial. Very small ! I always have these capacitors, and will never use them !
Now, before ordering, I verify the unity.
 

Offline I wanted a rude username

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Re: 0603 Metric Imperial Confusion
« Reply #8 on: October 31, 2019, 10:30:52 pm »
Challenge yourself.  >:D

0603 soldered onto pads designed for 1608 (imperial 0603):

 
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Offline Gribo

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Re: 0603 Metric Imperial Confusion
« Reply #9 on: November 01, 2019, 07:50:57 pm »
Meh, try Imperial 0402 and metric 0402 for a challenge.
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