20 A, 350 V fast recovery diode — what the 35 ns trr buys you
This trr figure places it in the fast-recovery class — under 500 ns at currents above 200 mA — making it suitable for continuous-conduction-mode PFC boost stages and the output rectification stage of a 200-240 VAC input SMPS, where switching losses at 50-100 kHz are dominated by the diode's recovery charge.
Forward drop and leakage — the thermal budget drivers
Maximum forward voltage is 1.35 V at 20 A. Reverse leakage is 10 µA at 350 V — low enough that the leakage contribution to the junction temperature rise is negligible at 150°C maximum junction temperature, but the leakage curve at elevated temperature should be reviewed against the actual operating VR for designs that push close to the 350 V ceiling.
Package and footprint — D2Pak with LPDS variant code
The RFN20NS3STL is supplied in a TO-263-3 (D2Pak) surface-mount package, with ROHM's internal supplier device package code LPDS. The D2Pak footprint is a standard high-current power package with a large copper tab for heatsinking. The LPDS code indicates a specific lead-frame or mold-compound variant — the land pattern should match the standard TO-263-3 pad layout, but the exact package drawing should be used to confirm the tab dimensions and lead coplanarity before committing the PCB.
It is ROHS3 compliant, clearing EU regulatory requirements for new designs.