2SD1990
Silicon NPN Triple Diffused Planar Transistor (Panasonic)
2SD1991A
Silicon NPN Transistor (Panasonic Semiconductor)
2SD1992A
Silicon NPN Transistor (Panasonic Semiconductor)
2SD1993
Silicon NPN Transistor (Panasonic Semiconductor)
2SD1995
Silicon NPN Transistor (Panasonic Semiconductor)
2SD1996
Silicon NPN Transistor (Panasonic Semiconductor)
2SD1996
Silicon PNP Transistor (Panasonic Semiconductor)
2SD1997
Epitaxial Planar Silicon Transistor (Sanyo Semicon Device)
2SD1998
PNP / NPN Epitaxial Planar Silicon Transistors (Sanyo Semicon Device)
2SD1999
PNP / NPN Epitaxial Planar Transistors (Sanyo Semicon Device)