This part is a kind of semiconductor called C1740S.

Function of this product has 2SC1740S.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Transistors 2SC2412K / 2SC4081 / 2SC4617 / 2SC5658 / 2SC1740S General purpose transistor (50V, 0.15A) 2SC2412K / 2SC4081 / 2SC4617 / 2SC5658 / 2SC1740S !Features 1) Low Cob. Cob=2.0pF (Typ.) 2) Complements the 2SA1037AK / 2SA1576A / 2SA1774H / 2SA2029 / 2SA933AS. !External dimensions (Units : mm) (1) 2SC2412K 2SC4081 (1) 2SC4617 0.65 0.65 (2) 0.95 0.95 1.9 1.3 2.0 (1) (2) 0.2 0.5 0.5 (3) 0.4 (3) 0.3 1.6 2.8 2.1 0.8 0.2 0.15 1.6 0.7 0.9 0.15 0.2 1.25 0.3 (3) 0.55 0.15 0.8 1.1 0~0.1 0.3Min. !Structure Epitaxial planar type NPN silicon transistor Each lead has same dimensions ROHM : SMT3 EIAJ : SC-59 JEDEC : SOT-346 (1) Emitter (2) Base (3) Collector 0~0.1 0.1Min. 0.1Min. Each lead has same dimensions ROHM : UMT3 EIAJ : SC-70 JEDEC : SOT-323 (1) Emitter [ ... ]

C1740S PDF Datasheet Download