The 2STF1550 and 2STN1550 are NPN transistors manufactured using new “PB-HCD” (Power bipolar high current density) technology. The resulting transistor shows exceptional high gain performances coupled with very low saturation voltage.

Very low collector-emitter saturation voltage
Fast switching speed
High current gain characteristic
Surface mounting devices in medium power SOT-89 and SOT-223 packages
Applications
Emergency lighting
LED
Motherboard and hard disk drive
Mobile equipment
Battery charger
Voltage regulation