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Transistors
Index

    Symbol.
    Numbering System.
    Pro-Electron Numbering System.
    JEDEC Numbering System.
    JIS Numbering System.


Symbol

NPN   PNP

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Transistor Number Systems
It is possible to determine details about a transistor from its part number. There are three systems that are in operation, namely the European based Pro-electron system, the American based JEDEC system and the Japanese JIS system.

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Pro-Electron Numbering System

1st Letter - specifies the semiconductor material

2nd Letter - specifies the type of device

Serial number

A Germanium
B Silicon
C Gallium Arsenide
R Compound Materials

A Diode, low power or signal
B Diode, variable capacitance
C Transistor, audio frequency low power
D Transistor, audio frequency power
E Diode, tunnel
F Transistor, high frequency low power
G Miscellaneous devices
H Diode, sensitive to magnetism
L Transistor, high frequency power
N Photocoupler
P Light detector
Q Light emitter
R Switching device, low power e.g. thyristor, diac, unijunction etc
S Transistor, low power switching
T Switching device power, e.g. thyristor, triac, etc.
U Transistor, switching power
W Surface acoustic wave device
X Diode, multiplier, e.g. varactor
Y Diode, rectifying
Z Diode, voltage reference

The characters following the first two letters form the serial number for the device type. Those intended for domestic use have a three-figure number (100 - 999), those intended for commercial use normally have one letter and two figures (A10 - Z99)

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JEDEC (Joint Electron Device Engineering Council)

1st Number designates the type of device   2nd Number The following figures denote the device serial number Suffix Optional
1 Diodes
2 Bipolar transistors
3 FET devices
4 OptoCoupler
5 OptoCoupler
Serial number of component 
yields no indication of function or spec.  Since this is a serial number may provide insight into date.
  A = low gain
  B = medium gain
  C = high gain

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JIS (Japanese Industrial Standard)

1st Number designates the type of device  2nd Letters The following figures denote the device serial number Suffix Optional
1 Diodes
2 Bipolar transistors
3 FET devices
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
Serial number of component 
yields no indication of function or spec.  Since this is a serial number may provide insight into date.
Suffix indicates that
the type is approved for
use by various
Japanese organisations

This page last updated on 12-09-04 by CliveTEC

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