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ISO7421: EFT burst test problem

Part Number: ISO7421

Dears,

Our customer is using ISO7421 in his design. He had done a EFT burst test, but it failed. The test condition is 1kV, 5kHz, 1 minute. Does this device could bear 1kV EFT burst? If couldn't, kindly suggest some methods to solve this problem.

Thanks for your help in advance.

Regards,

Ricardo Li