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Beginning of the End for SMT Component Markings?

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Dom Lodge
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Counterfeiting
Dom Lodge   2/25/2014 6:56:25 AM
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I wonder what future impact this may have on counterfeiting if it was to be applied to all components.  One fo the first things to check is whether the markings are correct / have been changed

Wnderer
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Re: Resistor colors
Wnderer   2/24/2014 11:50:54 PM
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Picking resistors with readable color codes was part of speccing the component back in the thru-holes days. Yes there were these cheap cylindrical brown ones that were almost impossible to read.  We used the peanut shaped beige ones which were readable and the 1% resistors had color codes, too. The 1% had an extra color line. I use to train assemblers to read the color codes and use them to inspect boards. Color codes were very useful. Even if they didn't read the codes, comparing to a known good board, a wrong color component was visibly different. Try that with tiny printing.

seaEE
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Re: Not just resistors
seaEE   2/24/2014 10:45:08 PM
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I heard they are planning to completely get rid of resistors, both leaded and surface mount, because...resistance is futile.

zeeglen
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Re: Resistor colors
zeeglen   2/24/2014 10:35:12 PM
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@Martin

Exactly -some of the paints are so unclear -red, orange brown can be hard to distinguish.  Sometimes the brown band to designate 1% is the same width as all the other bands - so which end do you read from?  And if the body colour is other than neutral, be careful - the body colour can mix with the bands to make them undecipherable.

Another PO (no, not Purchase Order) is those thru-hole resistors printed with text - when reverse engineering a board, the damn value is always facing DOWN against the pcb.  Same with thruhole caps and diodes - ARRRRGGGHH!

MeasurementBlues
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Markings are irrelevant
MeasurementBlues   2/24/2014 10:32:57 PM
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They are too small for me to read anyway.

MeasurementBlues
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Re: Not just resistors
MeasurementBlues   2/24/2014 10:30:35 PM
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MeasurementBlues
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Resistor colors
MeasurementBlues   2/24/2014 10:28:34 PM
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@Max "the colored bands on the resistors served to distinguish their values,"

Speak for yourself!


By that I mean what if you can;t distinguish resistor colors? In particular ,red, green, brown. I can't and haven't for many years. Even at my first job, I always used 1% resistors because the values were printed with numbers.

I once write a piece called "Help me read this resistor." Perahps it's time to dig it up and post it here.

zeeglen
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Re: Not just resistors
zeeglen   2/24/2014 9:02:43 PM
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@ Rcurl  You know, I've always wondered why surface mount ceramic capacitors are not marked.

You CAN get SMT capacitors marked with value codes -

http://www.vishay.com/doc?45028

Rcurl
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Re: Not just resistors
Rcurl   2/24/2014 4:28:35 PM
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I just received this from the Managing Director at Yageo:

We are in process with Digieky to make all their inventory in "Marking Product". Then you just order as usual.
However this process is still running and we can not make a digital swtich. Please understand.



I think I'll steer clear of their product for a while until you folks use up all of the unmarked stuff. Whoever uses the last unmarked resistor, please give me a heads-up!

 

Max The Magnificent
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Re: What about surface mount capacitors?
Max The Magnificent   2/24/2014 4:18:20 PM
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@Wnderer: I've given this some thought. The very least they could do is color code them within a factor of ten.

Not a bad idea ... maybe have a number of dots for cap value, voltage, etc.

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