What is the Theta-jc value for the ADM3251E?
Theta-ja is quoted on the datasheet as 47.05 degC/W. There is no Theta-jc parameter specified on the datasheet. This is because we normally only quote Theta-jc values where all or nearly all of the heat is dissipated through the surface in consideration. As stated in the datasheet, because it is not possible to apply a heat sink to an isolation device, the device primarily depends on heat dissipating into the PCB through the ground pins.
Based on a 20-ld wide body SOIC package with 6 internal die the Theta-jc would be ~15 degC/W.
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