This part is a kind of semiconductor called D1640.

Function of this product has 2SD1640.

Manufacturers : Panasonic

Image and pinout :

Some of the text within the PDF file :

Power Transistors 2SD1640 Silicon NPN epitaxial planar type darlington Unit: mm For low-frequency output amplification φ 3.16±0.1 8.0+0.5 –0.1 3.2±0.2 3.8±0.3 1.9±0.1 • High forward current transfer ratio hFE • Large peak collector current ICP • High collector-emitter voltage (Base open) VCEO ■ Absolute Maximum Ratings Ta = 25°C Parameter Collector-base voltage (Emitter open) Collector-emitter voltage (Base open) Emitter-base voltage (Collector open) Collector current Peak collector current Collector power dissipation Junction temperature Storage temperature Symbol VCBO VCEO VEBO IC ICP PC Tj Tstg Rating 120 100 5 2 3 1.2 150 −55 to +150 Unit V V V A A W °C °C B 1 2 0.75±0.1 4.6±0.2 0.5±0.1 0.5±0.1 2.3±0.2 3 1.76±0.1 16.0±1.0 1: Emi [ ... ]

D1640 PDF Datasheet Download