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TPS23753, how to choose noise suppression parts

Dear Specialists,

MY customer is evaluating TPS23753EVM with customer's product.

In the noise test, it was malfunctioned by power supply noise. 

He selected common mode filter SSR21HS Series(KEMET) and was used on trial.

The result was OK, but he can't understand whether the part is available.

Because POE has a classification function, so he thinks it has a some kind of limitation.

Could you please advise?

Also,do you have any other recommend device of noise suppression.

I appreciate your great help and cooperation.

Best regards,

Shinichi

KEM_LF0002_SSR21HS.pdf.