What is it?? Hi all, I'm new to the forum, I think it is a diode. Can anyone tell me what it is and size? There are no markings on it.



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Yes, that looks like some kind of diode in an SMD package.

 

hi,
TS Image,

 

Yes, that looks like some kind of diode in an SMD package.

Thanks for the help. That's what i thought, is there a way to check the size or does it matter?

 

Did you try it and measure it on the diode range on a meter,?
Max.

 

Did you try it and measure it on the diode range on a meter,?
Max.

thanks for your reply, no i didn't it was black around it so i assumed it was blown.

 

You ought to check it as it might not be defective.

What are the physical dimensions? Maybe somebody can take a guess at the current rating.

 

They come in a variety of packages. When I see a cylindrical package, I think of the DO-213 package. There may be others that are also cylindrical like that.

 

Looks like a MELF package. Check it with the meter and see if it is a diode. No way to tell its specs without the datasheet, but at least you'll know what it is:

https://www.google.com/search?safe=...hUKEwiVpveSl8flAhVOLK0KHaSNAJ4Q4dUDCAc&uact=5

 

You ought to check it as it might not be defective.

What are the physical dimensions? Maybe somebody can take a guess at the current rating.

i checked the diode with a meter and it reads open. i do have another working board with the same components that is powered up. The voltage on one side it 120vac and on the other is 66vac. Does that help to determine the size?

 

i checked the diode with a meter and it reads open.

With an ohms range or diode check range?
You won't get a positive reading on the former, unless shorted.
Max.

 

i checked the diode with a meter and it reads open. i do have another working board with the same components that is powered up. The voltage on one side it 120vac and on the other is 66vac. Does that help to determine the size?

Actually, as a half wave rectifier those values are about right for AC vs. half-wave rectified AC (pulsed DC). If you put a known good diode in series with your meter's lead, the 120 VAC should read about 66 and depending on the orientation, the "66VAC" should read very low or about the same.

 

thanks for your reply, no i didn't it was black around it so i assumed it was blown.

One thing you cannot do in electronics is 'Assume'!
Max.

 

i checked the diode with a meter and it reads open. i do have another working board with the same components that is powered up. The voltage on one side it 120vac and on the other is 66vac. Does that help to determine the size?

That's great! It tells us a lot about the diode. For one thing, it probably needs to have a PIV spec. of more than a couple hundred volts and is probably not a high speed diode. Something like the 1N4004 might work, but we are not sure about the package.

 

Thanks, for all the help, i'm going to try the 1n4004 with SMD package. The board is trash if it doesn't work anyway so, its worth the try. Thanks again.