Japanese Industrial Standards (JIS) has standard JIS-C-7012 for semiconductor part numbers. The first digit denotes the p-n junction count ("3" may also denote a dual-gate FET); then follows the letter "S", then:
2nd letter
Type of semiconductor
<none>
Diode
A
high frequency PNP BJTs
B
audio frequency PNP BJTs
C
high frequency NPN BJTs
D
audio frequency NPN BJTs
E
Diode
F
Thyristor
G
Gunn diode
H
UJT
J
P-channel FETs (both JFETs and MOSFETs)
K
N-channel FETs (both JFETs and MOSFETs)
M
TRIAC
Q
LED
R
Rectifier
S
Signal diode
T
Avalanche diode
V
Varicap
Z
Zener Diode
Then follows the Japan Electronics and Information Technology Industries Association's Electronic DEvice REgistration Center (JEITA-EDEREC)-assigned part number, optionally followed by suffixes (such as "A", "B", "C", or "R", "O", "BL", standing for "Red", "Orange", "Blue" etc.) to denote variants, such as tighter hFE (gain) groupings.[1][2]
Example: 2SD965, but sometimes the "2S" prefix is not marked on the package – a 2SD965 might only be marked "D965"; a 2SC1815 might be listed by a supplier as simply "C1815", thus possibly creating confusion with Pro Electron abbreviated markings, because a transistor marked "D965" might either be a 2SD965 or a BD965.
^Renesas Electronics Corporation (June 2004). "Small Signal Transistor Type Designation" (PDF). Archived from the original (PDF) on March 4, 2016. Retrieved June 24, 2012.
^CliveTEC Electronic resources (September 9, 2004). "Transistor Data". Archived from the original on April 26, 2016. Retrieved June 24, 2012.
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