Is it possible to use the E-Pad (metal frame) exposed on the surface of a high-voltage IPD as a conductive pin?

No. The DIP26 and HSSOP31 packages for our high-voltage IPDs have an E-Pad (metal frame) exposed on the package surface. It must not be used as a conductive pin.

The circuit, operation and usage of the high-voltage IPD are also described in "High voltage intelligent power device application note“. Please also refer to this document.