This part is a kind of semiconductor called D1918.

Function of this product has 2SD1918.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

2SD2211 / 2SD1918 / 2SD1857A Transistors Power Transistor (160V , 1.5A) 2SD2211 / 2SD1918 / 2SD1857A !Features 1) High breakdown voltage.(BVCEO = 160V) 2) Low collector output capacitance. (Typ. 20pF at VCB = 10V) 3) High transition frequency.(fT = 80MHZ) 4) Complements the 2SB1275 / 2SB1236A. !External dimensions (Units : mm) 2SD2211 1.0 1.5 0.4 (1) 4.0 2.5 0.5 3.0 0.5 (3) 1.5 0.4 1.5 4.5 1.6 (2) ROHM : MPT3 EIAJ : SC-62 (1) Base(Gate) (2) Collector(Drain) (3) Emitter(Source) !Absolute maximum ratings (Ta = 25°C) Parameter Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current 2SD1857A Collector power dissipation 2SD2211 2SD1918 Tj Tstg PC Symbol VCBO VCEO VEBO IC Limits 160 160 5 1.5 3 1 2 1 10 150 −55 ∼+150 Unit 0.75 V V V A(DC) A(Puls [ ... ]

D1918 PDF Datasheet Download