This part is a kind of semiconductor called D1918.

Function of this product has Silicon NPN Power Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

isc Silicon NPN Power Transistor INCHANGE Semiconductor 2SD1918 DESCRIPTION ·Suitable for middle power drivers ·High voltage:VCEO=160V ·Complementary PNP types:2SB1275 ·100% avalanche tested ·Minimum Lot-to-Lot variations for robust device performance and reliable operation APPLICATIONS ·Motor drivers,LED driver,Power supply ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage 160 V VCEO Collector-Emitter Voltage 160 V VEBO Emitter-Base Voltage 5V IC Collector Current-Continuous 1.5 A ICM Collector Current-Peak PC Collector Power Dissipation @ TC=25℃ TJ Junction Temperature 3.0 A 10 W 150 ℃ Tstg Storage Temperature Range -55~150 ℃ isc website：www.iscsemi.com 1 isc & iscsemi is registered trademark isc Silicon [ ... ]

D1918 PDF Datasheet Download