Metal Oxide Varistors
Features
l
Wide operating voltage (V
1mA
) range from 18V to 1800V
l
Fast responding to transient over-voltage.
l
Large absorbing transient energy capability.
l
Low clamping ratio and no following-on current.
20D Series
General Information
l
Surge protection in consumer electronics
l
Surge protection in industrial electronics
l
Relay and electromagnetic valve surge absorption
l
Transistor, diode, IC, thyristor or triac semiconductor
protection
l
Surge protection in electronic home appliances, gas
and petroleum appliances
General Characteristics
l
Body: Nickel Plated
l
Devices with No Leads: Nickel Plated
l
Operating Temperature: -40ºC to +85ºC
l
Storage Temperature: -40
ºC
to +125ºC
l
Axial Devices: Tin Plated
Part Number Code
2
0
D
4
7
1
K
J
Element Diameter
Type
D:Disk
Nominal Varistor Voltage
471=47*10
1
V
Varistor Voltage
Tolerance
K =
±10
%
Surge Series
No Suffix:Standard
Type
J:High Surge Type
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-17
Page:1
Metal Oxide Varistors
Electrical Characteristics
Type Number
Standard
20D180K
20D220K
20D270K
20D330K
20D390K
20D470K
20D560K
20D680K
20D820K
20D101K
20D121K
20D151K
20D181K
20D201K
20D221K
20D241K
20D271K
20D301K
20D331K
20D361K
20D391K
20D431K
20D471K
20D511K
20D561K
20D621K
20D681K
20D751K
20D781K
20D821K
20D911K
20D951K
20D102K
20D112K
20D122K
20D152K
20D182K
High
Surge
/
/
/
/
/
/
/
/
20D820KJ
20D101KJ
20D121KJ
20D151KJ
20D181KJ
20D201KJ
20D221KJ
20D241KJ
20D271KJ
20D301KJ
20D331KJ
20D361KJ
20D391KJ
20D431KJ
20D471KJ
20D511KJ
20D561KJ
20D621KJ
20D681KJ
20D751KJ
20D781KJ
20D821KJ
20D911KJ
20D951KJ
20D102KJ
20D112KJ
20D122KJ
20D152KJ
20D182KJ
Varistor
Voltage
V
1mA
(V)
16~20
20~24
24~30
30~36
35~43
42~52
50~62
61~75
74~90
90~110
108~132
135~165
162~198
185~225
198~242
216~264
243~297
270~330
297~363
324~396
351~429
387~473
423~517
459~561
504~616
558~682
612~748
675~825
702~858
738~902
819~1001
855~1045
900~1100
990~1210
1080~1320
1350~1650
1620~1980
Max. Allowable
Voltage
V
AC
(V) V
DC
(V)
11
14
17
20
25
30
35
40
50
60
75
95
115
130
140
150
175
195
210
230
250
275
300
320
350
385
420
460
485
510
550
580
625
680
740
900
1000
14
18
22
26
31
38
45
56
65
85
100
125
150
170
180
200
225
250
275
300
320
350
385
418
460
505
560
615
640
670
745
780
825
895
975
1220
1465
Max. Energy
(2ms)
(J)
(J)
Standard High Surge
5.4
6.6
8.1
9.9
11.7
14.1
16.8
20.4
24.6
30.0
36.0
45.0
54.0
60.0
66.0
72.0
81.0
90.0
99.0
108.0
117.0
129.0
141.0
153.0
168.0
186.0
186.0
186.0
187.2
196.8
218.4
228.0
240.0
264.0
288
359.0
432.0
/
/
/
/
/
/
/
/
30.8
37.5
45.0
56.3
67.5
75.0
82.5
90.0
101.3
112.5
123.8
135.0
146.3
161.3
176.3
191.3
210.0
232.5
232.5
232.5
234.0
246.0
273.0
285.0
300.0
330.0
360
449.0
540.0
Max. Clamping
Voltage
（8/20μs）
I
P
(A)
25
25
25
25
25
25
25
25
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
100
V
C
(V)
38
43
53
65
77
93
110
135
135
165
200
250
300
340
360
395
455
505
550
595
650
710
775
842
920
1025
1120
1240
1290
1355
1500
1570
1650
1815
2010
2475
2970
Withstanding Surge
Current（8/20μs）
I(A)
I(A)
Standard High Surge
2000
2000
2000
2000
2000
2000
2000
2000
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
6500
/
/
/
/
/
/
/
/
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
10000
20D Series
Typical
Rated
Capacitance
Power
(Reference)
(W)
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
@1KHz(pf)
39000
32000
22000
18000
16000
14000
12000
10000
5800
4800
3800
3000
2600
2400
1800
1500
1400
1350
1300
1250
1180
1100
1050
1000
970
950
900
850
750
700
600
580
500
450
440
400
220
Note: The energy (10/1000μs) is about 1.4 times of energy(2ms)
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-17
Page:2
Metal Oxide Varistors
Electrical Ratings
Items
Varistor Voltage
Maximum Allowable
Voltage
Test Condition/Description
The voltage between two terminals with the specified measuring current 1mA.DC applied is called
Vb.
The recommended maximum sine wave voltage (RMS) or the Maximum DC voltage can be
applied continuously.
The maximum voltage between two terminals with the specification standard impulse current.
Applied waveform: 8/20μs
I
1.0
0.9
B
20D Series
Requirement
Maximum Clamping
Voltage
0.5
T
2
To meet the
Specified value
0.1
0.0
O
1
C
T
T
1
t
30% max.
T1=1.25*T=8μs±20%
T2=20μs±20%
Rated Wattage
Energy
Withstanding Surge
Current
The maximum average power that can be applied within the specified ambient temperature.
The maximum energy within the varistor voltage change of
±10%
when one impulse of 10/1000μs
or 2ms is applied.
The maximum current within the varistor voltage change of
±10%
with the standard impulse
current (8/20μs) applied one time.
The change of Vb shall be measured after the impulse listed below which is applied 10,000 times
continuously with the interval of ten seconds at room temperature.
Surge Life
20Φ series
180K to 680K
820K to 182K
100A (8/20μs)
200A (8/20μs)
ΔVb
≤ ±10%
Vb
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-17
Page:3
Metal Oxide Varistors
Soldering Recommendation
Wave Lead Free Soldering Recommendation
Item
300
Preheating
Maximum Wave 265°C
Soldering
Cooling
20D Series
Conditions
265ºC
10 seconds (max.)
1 time
Peak Temperature
Dipping Time
Soldering
250
Temperature(°C)
200
150
100
50
0
0
0.5
1
1.5
2
2.5
Time(minutes)
3
3.5
4
Recommendation Reworking Conditions with Soldering Iron
Item
Temperature of Soldering Iron-tip
Soldering Time
Distance from Varistor
Conditions
360ºC (max.)
3 seconds (max.)
2mm (min.)
Dimensions
TABLE 1
Symbol
H(max)
L(min)
D(max)
D1(±1.0)
T(max)
d(±0.1)
Millimeter
26.0
15.0
23.0
10.0
TABLE 2
1.0
0.039
Inches
1.024
0.591
0.906
0.394
Packaging Quantity: 250pcs/bag
TABLE 2---T(max.)
Model
180K~390K
470K~680K
820K~151K
181K~271K
331K~391K
Millimeters
8.5
9.0
9.5
10.0
10.5
Inches
0.335
0.354
0.374
0.394
0.413
Model
431K~561K
621K~781K
821K~122K
152K
182K
Millimeters
11.0
11.5
12.0
12.5
13.0
Inches
0.433
0.453
0.472
0.492
0.512
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-17
Page:4
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