ADuM3400 & ADuM140E1 Internal ESD enhancements

Hi Yuya, 

It's important not to violate the datasheet's absolute maximum conditions in order to protect against latchup. A latchup event may lead to junction temps beyond the safe limiting power. One method would be to add external Zener diodes. Both isolators would need external components if they were to be subjected to stresses beyond the abs max conditions in the application.

Regards,
Jason 

Hi, Jason

Thank you for your answer.
In order to protect the latchup, both ADuM3400 and ADuM140E1 need to add an external Zener diode, for example.

I understood that there is no Zener diode for ESD design improvement inside the IC.

Do you have the answer as to whether the ADuM140E1 has the additional improvements that the ADuM3400 also has? (Contents described in AN-793)

Best regareds,

Yuya

Hi Yuya, 

I don't have the specific techniques used for the ADuM140E1. But the ADuM140E1 isolator pins pass +/-4kV HBM ESD testing to the local ground just like the ADuM3400 pins do.  

Regards,

Jason

Hi Yuya, 

I don't have the specific techniques used for the ADuM140E1. But the ADuM140E1 isolator pins pass +/-4kV HBM ESD testing to the local ground just like the ADuM3400 pins do.  

Regards,

Jason