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ISO7842: vs ISO7742 + SN6501 for EMI

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Part Number: ISOW7842


My customer is selecting ISO device and worried about  "ISOW7842" or "ISO7742+SN6501".

They mind not size but efficiency and EMI(and cost).

I'm understanding that efficiency of ISO7742+SN6501 is greater than ISOW7842.

How about is EMI? Which one is better? 

Please let me know if you have any question.

Best Regards,