BISS Transistors NXP Semiconductors low VCEsat BISS (Breakthrough in Small Signal) transistors are best-in-class devices that set a new benchmark for minimizing on-state resistance and switching times. The NXP Semiconductors 4021 and 4041 BISS transistors deliver low-loss load switching performance comparable to products twice their size. The 4032 BISS transistors are optimized for high-speed switching applications. NXP Semiconductors BISS transistors deliver high electrical performance (IC and ICM) in less space and high energy efficiency with less heat generation. These NXP devices are suitable for use in automobiles, with AEC-Q101 qualification.