What this HEXFET power MOSFET brings to the board
The IRLU3802PBF is an N-channel HEXFET power MOSFET with 8.5 mOhm Rds(on) at 4.5 V Vgs. Rated for 84 A continuous drain current and 88 W power dissipation, this part sits comfortably in medium-current motor drives, battery-charger output stages, and DC-DC converter primary switches where through-hole mounting is preferred for thermal management. The gate is rated to ±12 V maximum, so a 12 V gate-drive supply is within the absolute maximum — but the real value is that the 4.5 V Rds(on) spec lets you run the gate from a 5 V microcontroller output or a 5 V gate-driver IC without adding a level shifter.
Gate charge and switching — what the numbers mean for your driver
Total gate charge is 41 nC at Vgs = 5 V. Input capacitance is 0.0025 µF.
Temperature range and thermal handling
The junction temperature range is -55°C to 175°C.
Through-hole package — a deliberate choice for thermal and mechanical reasons
The IRLU3802PBF comes in a through-hole package.
Sourcing and lifecycle
The IRLU3802PBF is listed as Active in production status — no end-of-life notice, no last-time-buy window. It remains a standard catalog item from Infineon (formerly International Rectifier) and is available through independent distribution channels. For BOM planning, this part carries no imminent obsolescence risk, though it is always wise to qualify a second-source alternative for high-volume production.