Electronics > Projects, Designs, and Technical Stuff

Can I use a normal Ceramic cap instead of this cap

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TimNJ:
You can use surface mount...but you should still be aware of the potential issues caused by using large surface mount capacitor packages. Cracking during soldering, board flex, etc. I'm not sure if these things affect the fail-safe nature of X/Y-rated caps...but I'd expect that they might. About 10 years ago, the company I work for issued a directive to stop using surface mount Y-caps after having a number of issues with them. Your mileage may vary, but just keep it in mind.

SiliconWizard:

--- Quote from: TimNJ on July 29, 2019, 05:17:51 pm ---You can use surface mount...but you should still be aware of the potential issues caused by using large surface mount capacitor packages. Cracking during soldering, board flex, etc. I'm not sure if these things affect the fail-safe nature of X/Y-rated caps...but I'd expect that they might. About 10 years ago, the company I work for issued a directive to stop using surface mount Y-caps after having a number of issues with them. Your mileage may vary, but just keep it in mind.

--- End quote ---

Good point. Y-rated SMD caps would "pass" has a valid solution regulatory-wise, but I agree they can still be less reliable.
Now those caps are supposed to be built as not to fail as shorts in case of cracking, but I guess that could still affect their characteristics and have an impact on safety.


tooki:

--- Quote from: Siwastaja on July 24, 2019, 01:55:33 pm ---Please stop before you kill someone. You are not up to this task. This is really a life-critical component. People have been actually killed by this exact design inability.

Look for expert help in designing this.

--- End quote ---
Agreed. This falls squarely into the “if you have to ask, you’re not ready to be doing this task” area.

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