COMMON SILICON TRANSISTOR PINOUTS
TRANSISTOR NUMBERING SYSTEMS
JEDEC (JOINT ELECTRON DEVICE ENGINEERING COUNCIL)
example: 2N2222
First Number
1 = Diode
2 = Bipolar transistor or single gate field effect transistor
3 = Dual gate field effect transistor
Second Letter
= N
Subsequent numerals
= Serial number
Important to note that there is no correlation between the number assigned and the type or properties of a transistor. Numbers are assigned in order of registration.
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JIS (JAPANESE INDUSTRIAL STANDARD)
example: 2SC828
First Number
1 = Diode
2 = Bipolar transistor or single gate field effect transistor
3 = Dual gate field effect transistor
Second and Third Letters
SA: PNP HF transistor
SB: PNP AF transistor
SC: NPN HF transistor
SD: NPN AF transistor
SE: Diodes
SF: Thyristors
SG: Gunn devices
SH: UJT
SJ: P-channel FET/MOSFET
SK: N-channel FET/MOSFET
SM: Triac
SQ: LED
SR: Rectifier
SS: Signal diodes
ST: Avalanche diodes
SV: Varicaps
SZ: Zener diodes
Subsequent Numerals
The serial number follows the first digit and the two semiconductor device type letters. The numbers run between 10 and 9999.
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PRO-ELECTRON / EECA (EUROPEAN ELECTRONIC COMPONENT MANUFACTURERS ASSOCIATION)
example: BC549C
First Letter
The first letter indicates the material.
A = Germanium
B = Silicon
C = GaAs
R = Compound materials
Second Letter
The second letter indicates the device application.
A: Diode RF
B: Variac
C: Transistor, AF, small signal
D: Transistor, AF, power
E: Tunnel diode
F: Transistor, HF, small signal
K: Hall effect device
L: Transistor, HF, power
N: Optocoupler
P: Radiation sensitive device
Q: Radiation producing device
R: Thyristor, Low power
T: Thyristor, Power
U: Transistor, power, switching
Y: Rectifier
Subsequent Characters
The serial number of the device.
- domestic use has three numbers
- commercial or industrial use has a letter followed by two numbers, i.e. A10 – Z99.
Suffix
A = low gain
B = medium gain
C = high gain
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MANUFACTURERS OWN SCHEME
NOTE: Some manufacturers will follow their own numbering schemes
example: MPSA by Motorola, and a lot of old germaniums, NKT etc, but that’s another topic entirely
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MILITARY SPEC
There are several different codes between the UK, NATO, the US, and of course, the Soviet Union. I will not attempt to list them all here.
CV: UK
Usually CV followed by 4 numbers – no relation to the original part number.
JAN: USA
JAN is a prefix ahead of normal JEDEC code