Split-gate power MOSFETs streamline thermal and switching trade-offs

Modern power designs are being pushed in two directions at once, higher current density on the PCB and tighter efficiency targets across load, temperature, and switching frequency. That creates a familiar set of trade-offs, conduction loss versus switching loss, plus thermal paths that often dictate overall size more than the schematic does.

The Renesas REXFET-1 N-channel power MOSFET family targets this balance with split-gate technology and package options that let designers scale from compact point-of-load stages to high-current conversion. Across the range, the MOSFETs are specified for low drain-to-source on-state resistance (RDS(on)), low input capacitance, and 100% avalanche testing, with operating junction temperature specified from -55°C to 175°C.

Where the family becomes especially useful is packaging. For space-constrained layouts that still need solid thermal performance and automated optical inspection support, small outline, 8-pin, flat lead (SO8-FL) and ultra-small outline, 8-pin, flat lead (μSO8-FL) packages use wettable flanks, helping assembly quality while keeping the footprint small. For higher power stages, the TO-Leadless (TOLL) and TO-Leaded top-side cooling (TOLT) options support top-side cooling, allowing heat extraction through the top of the package for compact, high-power boards. If thermal cycling robustness is a priority, the TO-Leaded with gullwing leads (TOLG) option keeps a similar profile to TOLL while using gullwing leads aimed at high thermal cycling capability.