ADuM3400 & ADuM140E1 Internal ESD enhancements

Question

Hi 
 I am considering latchup on the ADuM3400 and ADuM140E1. I have two questions. 
 ① According to AN-793, ADuM3400 has improved design of ESD enhancements. Is this design improvement applied to the ADuM140E1? 
 ② Does the ADuM3400 and ADuM140E1 have the transient absorbing Zener diode described in AN-793? 
 Best Regards 
 Yuya

jnaso · Accepted Answer

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

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ADuM3400 & ADuM140E1 Internal ESD enhancements

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