This part is a kind of semiconductor called D1609.

Function of this product has 2SD1609.

Manufacturers : Hitachi Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr 2SD1609, 2SD1610 Silicon NPN Epitaxial Application Low frequency high voltage amplifier complementary pair with 2SB1109 and 2SB1110 Outline TO-126 MOD 1 1. Emitter 2. Collector 3. Base 2 3 Absolute Maximum Ratings (Ta = 25°C) Ratings Item Collector to base voltage Collector to emitter voltage Emitter to base voltage Collector current Collector power dissipation Junction temperature Storage temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg 2SD1609 160 160 5 100 1.25 150 –45 to +150 2SD1610 200 200 5 100 1.25 150 –45 to +150 Unit V V V mA W °C °C Datasheet pdf - http://www.net/ www.DataSheet.co.kr 2SD1609, 2SD1610 Electrical Characteristics (Ta = 25°C) 2SD1609 Item Collector to base breakdown voltage C [ ... ]

D1609 PDF Datasheet Download