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?
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.
@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: 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.
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.
@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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