Primary-side switch for offline flyback converters
The STP5NK52ZD: Its 520 V drain-source breakdown voltage and 4.4 A continuous drain rating suit it for auxiliary supplies, LED drivers, and appliance power stages.
Gate drive and switching loss budget
Total gate charge is 16.9 nC at 10 V.
Maximum gate-source voltage is ±30 V.
NRND — plan a last-time buy or alternate
For a production BOM that already qualifies this MOSFET, the last-time-buy window may be open. For new designs, a pin-compatible SuperMESH replacement with similar voltage and current class should be evaluated.