40 V Vdss — the voltage ceiling that limits 48 V use
The 40 V drain-to-source rating is the hard voltage limit. A 48 V nominal bus (like telecom or industrial 48 V systems) exceeds this rating even at steady state, let alone during transients. This part is sized for 12 V, 24 V, or 36 V rails where the maximum peak stays under 40 V. For 48 V applications, look for a 60 V or 75 V rated MOSFET in the same D2PAK footprint.
Obsolete — sourcing from surplus and broker channels
Sourcing now runs through independent distribution and surplus stock.
3.7 mOhm Rds(on) — what it means for thermal design
Package and temperature range — D2PAK for surface-mount power
The D2PAK (TO-263-3) surface-mount package with exposed tab allows the PCB copper to act as a heatsink.
