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Rcurl
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Not just resistors
Rcurl   2/24/2014 1:18:36 PM
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You know, I've always wondered why surface mount ceramic capacitors are not marked. On more than one occasion I've had to remove a capacitor from a board just so I could do an out-of-circuit test to verify that it was the correct part.

I for one would be willing to pay double to get ceramic capacitors that are clearly marked.

Will IC's be next?

Is anyone buying the justification that the reason for removing the markings is for environmental reasons?

 

Max The Magnificent
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Re: Not just resistors
Max The Magnificent   2/24/2014 1:24:09 PM
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Hi Rick -- the hot-off-the-press news is that, almost as soon as I'd posted this blog, I heard that the rumor in the street is that Yageo has agreed to continue supplying marked SMD resistors to Digi-Key and other Distributors.

Break out the party hats!!!

 

Max The Magnificent
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What about surface mount capacitors?
Max The Magnificent   2/24/2014 1:26:14 PM
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I think we should start a campaign to persuade manufacturers to add markings to their surface mount capacitors!

Rcurl
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Re: What about surface mount capacitors?
Rcurl   2/24/2014 1:32:27 PM
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@Max: I think we should start a campaign to persuade manufacturers to add markings to their surface mount capacitors!

Like I said, I would GLADLY pay extra for that. Surely one of the capacitor manufacturers would be willing to do it for an extra charge.

Max The Magnificent
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Re: What about surface mount capacitors?
Max The Magnificent   2/24/2014 1:39:34 PM
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@Rick: Like I said, I would GLADLY pay extra for that.

Actually, I think you said "I would gladly pay double to get capacitors with markings on them." ... So, if I bought a reel of capacitors for $x and market them up, you'd pay me $2x ... maybe I should go into business doing this LOL

Wnderer
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Re: What about surface mount capacitors?
Wnderer   2/24/2014 1:43:44 PM
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I've given this some thought. The very least they could do is color code them within a factor of ten.

1-9pF :Black

10-99pF :Brown

100pF-999pF :Red

1nF-9nF :Orange

10nF-99nF :Yellow

100nF - 999nF :Green

1uF - 9uF : Blue

10uF -99uF: Violet

100uF -1000uF: White

Bigger than that they can write numbers on it.

If you want to get more precise, you can add a single colored dot on the colored package. That should be close enough for most capacitive needs.

 

Rcurl
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Re: What about surface mount capacitors?
Rcurl   2/24/2014 1:55:57 PM
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@Max: Maybe I should go into business doing this LOL

Ain't capitalism wonderful!

...But by the end of the day you're going to have writer's cramp from writing numbers on all those tiny parts!

 

Rcurl
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Re: What about surface mount capacitors?
Rcurl   2/24/2014 2:02:05 PM
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@Wnderer: The very least they could do is color code them within a factor of ten.

 That would really help, but for 1206 and larger they could just as easily write the value.

On second thought, perhaps they could write the value and then use a color code for the voltage or dielectric type.

Now that we're talking about this, perhaps the reason they don't mark them is that for a resistor you can tell the approximate wattage just from looking at it, and you can guesstimate the maximum allowable voltage too, but for capacitors, it would be good to know the value, the voltage, and the tempco at least.

Wnderer
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Re: What about surface mount capacitors?
Wnderer   2/24/2014 2:17:32 PM
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I was thinking about ceramic 0603s where I standardize tempco and voltage. Below 1nF they should all be 50V NPO and between 1nF and 100nF they should all be 50V X7R. Above 100nF things start getting complicated. And yes in higher voltage circuits we have some higher voltage parts. I guess I see your point.

Rcurl
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Re: Not just resistors
Rcurl   2/24/2014 3:34:02 PM
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@Max: the hot-off-the-press news is that, almost as soon as I'd posted this blog, I heard that the rumor in the street is that Yageo has agreed to continue supplying marked SMD resistors to Digi-Key and other Distributors.

I just got confirmation of that from Yageo.  My two questions are:

1. Since they didn't change the part number, how can I be assured that I will not receive any of the millions of unmarked ones they just produced?

2. Will ALL of their new resistors be marked now, or is it just by request? Aside from looking at each reel, how will the distributors be able to tell the difference?

I sent an inquiry to Yageo a few minutes ago.  I'll post the response here.

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