Transistor and Diode Data


Part Numbers on Transistor & Diodes typically follow one of 3 conventions Pro-Electron, JEDEC, or JIS.  These are described below.

Pro-Electron
Form: two letters, [ optional letter], serial number,
Example: BC108A, BAW68, BF239
 
 
1st Letter - specifies the semiconductor material 2nd Letter - specifies the type of device Optional 3rd  Letter 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 third letter indicates that the device is intended for industrial or
professional rather than commercial applications. It is usually a W,X,Y or Z.		 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 (W10 – Z99)

JEDEC (Joint Electron Device Engineering Council)
Form: digit, letter, serial number, [suffix]
Example: 2N2222A, 2N904
 
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		 N  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


Japanese Industrial Standard (JIS)
Form:  digit, two letters, serial number, [suffix]
Example: 2SA1187, 2SB646
 
1st Number designates the type of device  2 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


Manufacturer Specific

Apart from JEDEC, JIS and Pro-electron, manufacturers often introduce their
own types, for commercial reasons (ie to get their name into the code) or to
emphasise that the range belongs to a specialist application.
Common brand specific prefixes are:

MJ: Motorolla power, metal case
MJE: Motorolla power, plastic case
MPS: Motorolla low power, plastic case
MRF: Motorolla HF, VHF and microwave transistor
RCA: RCA
RCS: RCS
TIP: Texas Instruments power transistor (platic case)
TIPL: TI planar power transistor
TIS: TI small signal transistor (plastic case)
ZT: Ferranti
ZTX: Ferranti

Examples-  ZTX302, TIP31A, MJE3055, TIS43.