[sdiy] No marking on resistors

[Tim Ressel]

Considering that some SMT caps are not marked and many of the smaller 
SMT resistors aren't marked either .. is it really that much of a 
surprise? Because of the ceramic SMTs not being marked we all have to 
develop the discipline to keep track of the parts. You can't just drop a 
strip of caps on the bench; you have to put it back in the marked 
bag/box/whatever. Since we all can do that, we can certainly do that for 
resistors as well.

As for repairs, shucks, I dunno. Make it all open source?  Ask someone 
with  the same device to measure R38 because yours is burned up?  Come 
to think of it, if a PTH resistors burns hard enough you may not be able 
to read the codes anyway.

I used to eschew 0603s because they were not marked. Maybe I was being 
silly...

--TimR


On 4/2/2018 11:39 AM, Roman wrote:
> As someone have predicted it not so long ago on this list, it's 
> already happening.
> Vishay will not be putting any marking on their general purpose 
> standard resistors, even the largest ones.
>
> "The marking of Vishay’s standard R-chips in the 0603 to 2512 case 
> sizes — i.e. CRCW0603 – CRCW2512 with TCR of ± 200 ppm/K / 5 %, TCR of 
> ± 100 ppm/K / 1 %, and TCR of ± 200 ppm/K / 1 %, 0.0 Ω — will be 
> discontinued to improve the efficiency of the production process. Reel 
> labels will enable product identification as before, and part numbers 
> will not be changed. There will be no impact to the products’ 
> performance or technical and environmental specifications (except the 
> marking)."
>
> Later they explain that various marking styles common today are only 
> causing problems by fooling AOI and that no marking is actually better 
> obviously.
>
> So anything better than 1% and 100ppm will be still marked hopefully, 
> at least for couple of years.
> The other makers will follow soon I guess.
> It would be good April Fools message if it was not a letter from March 
> 28th.
>
> Roman
>
>
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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