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V26SM20 Datasheet(PDF) 2 Page - Littelfuse

Part # V26SM20
Description  Varistor Products - Surface Mount Varistors
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Manufacturer  LITTELFUSE [Littelfuse]
Direct Link  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

V26SM20 Datasheet(HTML) 2 Page - Littelfuse

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Varistor Products
©2010 Littelfuse, Inc.
Revision: May 11, 2010
SM20 Series Varistor
Surface Mount Varistors > SM20 Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/sm20.html for current information.
Repetitive Surge Capability
V175SM20 - V320SM20
10,000
2,000
200
100
50
20
10
5
2
500
20
100
1,000
10,000
IMPULSE DURATION (μs)
1
2
104
105
106
MODEL SIZE 20mm
V175SM20 - V320SM20
103
INDEFINITE
1,000
102
10
5,000
1
For applications exceeding 85ºC ambient temperature, the peak
surge current and energy ratings must be reduced as shown below
Peak Pulse Current Test Waveform for Clamping Voltage
Peak Current, Energy and Power Derating Curve
0
1 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T
1 = Rise Time = 1.25 x T
T
2 = Decay Time
Example - For an 8/20 μs Current Waveform:
8μs = T
1 = Rise Time
20μs = T
2 = Decay Time
0
50
100
TIM E
t
1
t
t
O
1
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100 110
120 130 140 150
AMBIENT TEMPERATURE ( oC)
SM20 Series Ratings & Specifications
Maximum Rating (85°C)
Specifications (25°C)
Continuous
Transient
Varistor Voltage
at 1mA DC
Test Current
Maximum
Clamping
Voltage
8 x 20 μs
Typical
Capacitance
f = 1MHz
V
RMS
V
DC
Energy
10 x 1000μs
Peak Current
8 x 20μs
Part
Number
Branding
V
M(AC)
V
M(DC)
W
TM
1x pulse
I
TM
1x pulse
V
NOM Min
V
NOM Max
V
C
I
PK
C
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(A)
(pF)
V26SM20
26SM20
20
26
20
160 (note 1)
2000
32
(10mA)
40
(10mA)
63
20
12000
V175SM20
175SM20
175
225
90
6500
247
303
455
100
1400
V230SM20
230SM20
230
300
122
6500
324
396
595
100
1100
V250SM20
250SM20
250
330
130
6500
354
429
650
100
1000
V275SM20
275SM20
275
369
140
6500
389
473
710
100
900
V300SM20
300SM20
300
405
165
6500
420
517
775
100
800
V320SM20
320SM20
320
420
150
6500
462
540
810
100
750
1. Energy rating for impulse duration of 30ms minimum to one half of peak current (automotive load dump).


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