Electronics > Beginners
Why do SMT capacitors have no markings?
Bud:
--- Quote from: Neilm on May 11, 2019, 05:00:25 pm ---Not so long ago there was a motion to remove markings from resistors. It would save money not having another step in the production.
--- End quote ---
All of 0603 resistors I bought lately from Digikey came unmarked.
T3sl4co1l:
Like I said, epoxy (heat or UV cure) or enamel (fired ceramic) would be entirely plausible, if all the other conditions for feasibility are met of course. :)
--- Quote from: Bud on May 12, 2019, 05:40:39 pm ---All of 0603 resistors I bought lately from Digikey came unmarked.
--- End quote ---
Panasonic? I have a few Panasonic that are unmarked (just black enamel).
Digikey sells a dozen brands of chip resistors, that's not very specific!
Tim
schmitt trigger:
Money.
MLCCs are produced and sold by the Gazillions. Even if you reduce a milliDollar or a milliEuro from its manufacturing costs, it will be serious money by the end of the day.
Also as other poster noted, big customers will always machine-place them, and as long as the reel has a barcode or RFID tag that a machine interface can read, it is sufficient identification.
And because electronics nowadays are essentially intended to be non-repairable, not by the end users at least, it does not matter it can't be identified once that it is soldered to the board.
I sometimes visit a PWBA-assembly house. They have many tape tails, containing a few components at most, which they simply discard. They have allowed me to take some of those tails, and back home with the help of a capacitor tester equipped with tweezers, I have been able to sort and identify those tails. Sufficient to say that I haven't required to purchase any 0.01uF, 0.1uF or 1uF MLCCs in several years.
Navigation
[0] Message Index
[*] Previous page
Go to full version