This part is a kind of semiconductor called D1664.

Function of this product has 2SD1664.

Manufacturers : Rohm

Image and pinout :

Some of the text within the PDF file :

Transistors Medium Power Transistor(32V , 1A) 2SD1664 / 2SD1858 FFeatures 1) Low VCE(sat), VCE(sat) = 0.15V (typical). (IC /I B = 500mA / 50mA) 2) Complements the 2SB1132 / 2SB1237. FStructure Epitaxial planar type NPN silicon transistor FExternal dimensions (Units: mm) FAbsolute maximum ratings (Ta = 25_C) (96-207-D12) 249 http:// Transistors FElectrical characteristics (Ta = 25_C) 2SD1664 / 2SD1858 FPackaging specifications and hFE hFE values are classified as follows : FElectrical characteristic curves 250 Transistors 2SD1664 / 2SD1858 251 [ ... ]

D1664 PDF Datasheet Download