PNP Type Surface Mount Transistor DSS5540X DSS5540X triode surface marking code ZPS54, is the equivalent transistor of triode 6040, used for hash board repair and component replacement of ASIC miner. Features ultra-low collector-emitter saturation voltage ideal for automated assembly processes. Completely lead-free, ideal for medium power switching or amplification applications. The complementary NPN transistor for the DSS5540X is the DSS4540X.