Electronics > Beginners
Why do SMT capacitors have no markings?
T3sl4co1l:
Ah, but humans -- and far more importantly, machines as well -- can read it. Labeled parts may be an important part of assembly inspection. That would be a point in favor of marked caps as well, but there is a cost breakdown between avoiding or optimizing rework through inspection (which mind, can be at PnP time, or AOI), and part cost, and there are typically fewer caps than resistors on a board making the advantage even thinner.
Another plausible explanation, but probably still not a wholly motivating one.
Note that this would only apply at scale -- even in the thousands, the few percent of rework can be done by hand. This would be in the 100k's where machine vision systems, as fully automated as possible, are justified.
Tim
RES:
https://en.wikipedia.org/wiki/Ceramic_capacitor#Marking
wraper:
--- Quote from: blueskull on May 12, 2019, 08:49:06 am ---
--- Quote from: wraper on May 11, 2019, 12:08:03 pm ---If you look how MLCC are produced, marking them individually would be pain in the ass not adding any additional value. Simply printing over bare ceramic once they are already produced won't work well.
--- End quote ---
Vishay safety rated caps are printed. Surely it can be done at a mass production scale.
--- End quote ---
Then look at their size and price. Not to say marking safety caps makes sense.
tooki:
--- Quote from: wraper on May 11, 2019, 12:08:03 pm ---If you look how MLCC are produced, marking them individually would be pain in the ass not adding any additional value. Simply printing over bare ceramic once they are already produced won't work well.
--- End quote ---
Why would it not work? You can inkjet print onto essentially any substrate.
radiolistener:
Printing may leads to change it's value :)
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