Sunday, January 24, 2021

Common Transistor Pinouts & Numbering Systems

COMMON SILICON TRANSISTOR PINOUTS

common 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



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