What this OptiMOS dual FET is and where it fits
The Infineon BSG0811NDATMA1 is a dual N-channel asymmetrical power MOSFET from the OptiMOS series, rated for 25V drain-to-source and delivering 19A continuous on one channel and 41A on the other. Packaged in a PG-TISON-8, it targets space-constrained power stages where two FETs share a common drain pad and the load currents are unequal — typical in synchronous buck converters, motor driver half-bridges, and battery management switching paths.
Asymmetric channels — why the different current ratings
One channel is rated for 19A continuous, the other for 41A. This asymmetry matches a half-bridge where the low-side FET carries the inductor current for a larger portion of the switching period (synchronous buck) or where the high-side sees pulsed current while the low-side handles the DC freewheel current. The 2.5W package power limit means the total dissipation across both channels combined is the real constraint in a real board — the 41A figure assumes ideal heatsinking on the larger channel.
Temperature range and environment
Junction temperature spans -55°C to 150°C, covering automotive under-hood and industrial motor-drive environments. The PG-TISON-8 package is a surface-mount power package with an exposed pad for thermal transfer to the PCB copper plane — plan a thermal via array under the part to keep junction temperature within limits at the 19A or 41A continuous currents.
Lifecycle and sourcing
No end-of-life notice on record, so this part is safe to specify into new designs without an LTB risk.