V-series IPM has VDA and VDN models of the same rating, but what is the difference between them?

VDA and VDN use different material for their insulating substrates, resulting in separate thermal resistance values. The VDA type uses aluminum oxide, while the VDN type uses high heat-radiation material, with approximately 30% less thermal resistance than that of VDA. It is effective when achieving a lower T_j max. or longer ΔT_j power cycle life expectancy.