Dual N-channel in a small TDSON — what it does under the hood
The IPG20N04S4L07ATMA1 from Infineon's OptiMOS series packs two independent N-channel MOSFETs into a single PG-TDSON-8-4 package, rated for 40V drain-source and 20A continuous drain current per channel at 25°C. Each channel's gate is logic-level — threshold voltage maxes at 2.2V with only 30µA of drain current, so a 3.3V or 5V GPIO can switch it on without a driver IC.
7.2 mOhm Rds(on) — the conduction loss number that matters
Maximum on-resistance is 7.2 mOhm at 17A drain current with 10V gate drive. That figure sets the I²R heating floor for a motor-drive or battery-switch design — at 10A per channel the dissipation is under 0.72W, well within the 65W package limit when the board copper pulls heat from the exposed pad.
AEC-Q101 and 175°C junction — built for the engine bay
The 3980 pF input capacitance at 25V Vds and 50 nC total gate charge at 10V mean the gate driver sees a moderate capacitive load; a 1A driver will switch it in under 100 ns.