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Сurrent consumption ADUM141E and ADUM1401


The client is using ADUM1401, but he wants to change to a newer ADUM141E. But he says that AdUM141E has a higher current consumption than ADUM1401, and a lot of heat dissipation. 
Data rate 2 MHz, continuous data transfer mode. Source of 8 channels.

At their speed, the microcircuit is not able to withstand the heat dissipation requirements.

How can this problem be solved? Why is ADUM141E more heat dissipated at the same speed?

Thanks in advance!

Best regards,