650 V N-channel in the isolated TO-220FP — what it brings to the switching supply
The STF45N65M5: Its 650 V drain-source rating and 35 A continuous drain current place it squarely in the offline power supply, PFC, and lighting ballast space.
The 40 W package limit from the TO-220FP means a heatsink is needed for continuous operation above a few amps.
TO-220 Full Pack — the isolated tab that saves an insulator
The TO-220-3 Full Pack (TO-220FP) is the fully isolated variant of the standard TO-220. The metal tab is encapsulated in the moulding compound, so the mounting surface is electrically isolated from the drain. The trade-off is higher thermal resistance junction-to-case compared to a standard TO-220, which is reflected in the 40 W dissipation ceiling. The through-hole mounting suits point-of-load stages on single-sided boards or where vibration resistance matters more than board density.
There is no last-time-buy notification or obsolescence risk on the near horizon. For a BOM that already qualifies this part, no urgency to re-spin or pre-buy exists — though stocking the line against a long forecast is always prudent for any discrete power device with a single-source wafer process.