Micro Commercial Components Corp. Single Bipolar Transistors FMMT4540X-TP

The FMMT4540X is an NPN bipolar transistor in an SOT-89 package, rated for a collector-emitter voltage of 40 V, a collector current of 4 A, and a power dissipation of 3.3 W at 25°C. It has a junction temperature range of -55°C to +150°C, thermal resistance from junction to case of 38°C/W, and junction-to-ambient thermal resistance of 250°C/W when mounted on an FR-4 board. The device is halogen-free, RoHS compliant, and meets UL 94 V-0 flammability rating. Current gain (hFE) ranges from 100 to 300 depending on collector current, with collector-emitter saturation voltage as low as 90 mV at 0.5 A and 5 mA base current. Transition frequency is 100 MHz at 10 V and 50 mA.