[sdiy] No marking on resistors

[Jay Schwichtenberg]

For SMT parts in tape like caps and resistors I take a extra fine point Sharpie and write the values on the back of the tape when I get them.

 

Learned doing that the hard way with unmarked caps.

 

Jay S.

 

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Tim Ressel
Sent: Monday, April 02, 2018 3:06 PM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] No marking on resistors

 

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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