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Classification of Diodes
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The Russian Diodes can be classified into following Categories based on
alphanumeric symbol of Part No.: -
Indigenisation
(a) 2S or KS (Version I)
Life Extension
Studies
(b) 2A or KA (Version I)
Logistic
Support
(d) 2U or KU (Version I)
(c) 2V or KV (Version I)
(e) D or 2D (Version II)
Decoding Alphanumeric Symbols of Part Numbers of Russian Diodes
Version - I
Each letter of Russian Diodes Part No. has got its scientific meaning as
explained below:For example A Diode with Part Number KB 105A whose english version KV105A
is decoded as follows:K
V
Fields No. I
II
1
05
A
III IV & V VI
Field I ---- The first letter defines the original semiconductor material for device.
It can be: A - Gallium components
G - Germanium or its compounds.
K - Silicon or its compounds.
Field II ----The second letter defines the type of diode as per its application.
A - Microwave Diode
D - Rectifier Diode
I - Tunnel and unitunnel Diode
L - Light Emitting Diode
S - Voltage Regulator Diode
U - Triode Thyristor
V - Variable Capacitance Diode
Tse - Rectifier units and stacks
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Field III----The third letter defines the application or utility. This field covers
following type of the diode as per significance of third letter.
(a) Variable capacitance diodes
1 – Trimming Variable capacitance diodes.
For example : Part Number KV 110A means it is silicon variable trimming diode.
(b) Tunnel and unitunnel diodes
1 – Amplifying
2 – Switching
4 – Unitunnel
I - Light emitting diodes of the infrared-frequency range.
For Example: Part Number AI 101A means arsenide – gallium light emitting
amplifying tunnel diodes.
(c) Microwave diodes
1 - Mixing
5 – Regulating
6 – Multiplying
For example: Part Number AA 111A means arsenide-gallium microwave
mixing diode
(d) Thyristors
1 – Light-power non-latched (with maximum forward
current of 0.3A)
2 – Medium power non-latched (with forward current of
minimum 0.3A and maximum 10A)
(e) Rectifying Diodes
1 – Low power, with average forward current not over 0.3A
2 – Medium power, with average forward current not over
10A
(f) Multipurpose Diodes
4 – Diodes with a working frequency not over 1000 MHz
(g) Signal Diodes
5 – Diodes with reverse resistance recovery time not over
150ns
(h) Voltage Regulator Diodes
1 – Not over 0.3 W in power and not lower than 10V in
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Zener voltage higher than 0.3W and not over 5W in power
5 – With zener voltage ranging between 10 and 99V
6 – With zener voltage ranging between 100 and 199V
Field IV & V ---- The fourth and fifth elements determine the ordinal number of
the device type from 1 through 99.
Field VI---- The sixth element defines the device parametric group within one
type.
Version II
3. Decoding of Diode with Part Number D or 2D. A Russian Diode with Part
Number D 223A means as follows :D 223 A
Field I
II
III
Field I ----The first letter D for diodes.
Field II ----The second letter is the ordinal number of the device type.
1 through 100 – germanium point contact diodes
201 through 300 – silicon junction diodes
301 through 400 – germanium junction diodes
401 through 500 – microwave mixing detectors
801 through 900 – voltage regulator diodes
So 223 is Silicon diode
Field III----The third letter showing the device group within one type.
A - Device Group
4. By applying the same principle on the Part number master data list, relevant
information could be obtained. However for few of them, no useful information
could be collated and the list of the same is as given below:List of Diodes for which No Specifications Available
Sl
No.
Part Number
Sl
No.
Part Number
1.
SM3-362-018 TU D223A
2.
SM3-362-018 TU D223B
3.
SM3-362-025TU D818G
4.
SM3-362-025TU D818V
5.
SM3-362-805TU2S133A
6.
SM3-362-805 TU 2S1147 A
7.
SM3-362-805TU 2 S156A
8.
SM3-362-805TU 2S168A
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9.
SM3-362-823TU 2S518A
10.
SM3.362.018TY
11.
SM3.362.025 TY
12.
SM3.362.805TY
13.
SM3.362.816TY
14.
TR3-362-067TU MD217
15.
TR3-362-067TU MD218
16.
2DS 523 BT
17.
2DS 523 GT
18.
UZH3-336-035TU
19.
2SM168BT
20.
MD218A
21.
MD217
22.
MD226A
23.
MD3
24.
NP-4
25.
SM3-362-010TU D219A
26.
SM3-362-010TU D220B
27.
SM3-362-012TU D814B
28.
SM3-362-012TU D814D
29.
SM3-362-012TU D814G
30.
SM3-362-012TU 814V
31.
SM3-362-018TU D223
32.
BP 50
33.
6BN293
34.
6BN239
35.
3D103B
EXPANSION OF ABBREVATIONS USED IN
SPECIFICATIONS AND ESSENTIAL RATINGS OF DIODES
SL.NO.
ABBREVATION
EXPANSION
1.
C tot
Diode Capacitance
2.
IF
Forward DC Current
3.
I F (AV)
Average Forward current
4.
I F max
Maximum forward DC Current
5.
IR
Reverse DC Current
6.
I R(AV)
Average Reverse Current
7.
I R(AV)max
Maximum Reverse Working Current
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8.
IZ
Zener Current
9.
IZ MAX
Maximum Zener Current
10.
IZ MIN
Minimum Zener Current
11.
PMAX
Maximum DC Power Dissipation
12.
trr
Reverse Recovery Time
13.
U(BR)
Breakdown Voltage
14.
UF
Forward DC Current
15.
UF(AV)
Average Forward DC Voltage
16.
UR
Reverse DC Voltage
17.
URM
Peak Reverse Voltage
18.
URMAX
Maximum Reverse DC Voltage
Mechanical Items || Electronic/Electrical Items
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