What the 12 mOhm Rds(on) means for your switching loss budget
The Infineon BSZ0909NSATMA1 is an N-channel OptiMOS MOSFET rated for 34 V drain-source and a maximum on-resistance of 12 mOhm at 20 A with a 10 V gate drive.
Gate drive and switching — 17 nC Qg keeps the driver happy
Total gate charge is 17 nC at 10 V. Input capacitance is 1310 pF at 15 V Vds.
Temperature range and environment — rated for the harsh spots
Junction temperature spans -55°C to 150°C. Maximum dissipation is 2.1 W at ambient and 25 W at case.
Package and footprint — PG-TSDSON-8 with exposed pad
Supplier device package is PG-TSDSON-8, an 8-lead PowerTDFN with a large exposed drain pad. The pad must be soldered to a copper plane on the PCB — without it the 36 A Tc rating is unreachable. The package is surface-mount, compatible with standard reflow profiles. Tape & Reel and Cut Tape options are available for prototyping and production.
Lifecycle and sourcing — active, no end-of-life concern
The BSZ0909NSATMA1 is listed as Active with no NRND or EOL flags. Infineon continues production in the OptiMOS family. ROHS3 compliant. For BOM planning, this part has no imminent LTB risk.
