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V22MA1S Datasheet(PDF) 3 Page - Littelfuse

Part # V22MA1S
Description  Axial Lead / Application Specific Varistors
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Manufacturer  LITTELFUSE [Littelfuse]
Direct Link  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

V22MA1S Datasheet(HTML) 3 Page - Littelfuse

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185
Varistor Products
Revision: January 9, 2009
©2008 Littelfuse, Inc.
MA Varistor Series
Axial Lead / Application Specific Varistors > MA Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
Should transients occur in rapid succession, the average power
dissipation required is simply the energy (watt-seconds) per
pulse times the number of pulses per second. The power so
developed must be within the specifications shown on the
Device Ratings and Specifications table for the specific device.
Furthermore, the operating values need to be derated at high
temperatures as shown above. Because varistors can only
dissipate a relatively small amount of average power they are,
therefore, not suitable for repetitive applications that involve
substantial amounts of average power dissipation.
Power Dissipation Ratings
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)
100
90
50
10
O1
T
T1
T2
TIME
Peak Pulse Current Test Waveform
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
Repetitive Surge Capability
100
50
20
10
5
2
1
0.5
0.2
0.1
20
100
1,000
10,000
IMPULSE DURATION (μs)
2
10
102
103
1
104
105
106
INDEFINITE
DISC SIZE 3mm
V120MA1A - V430MA7B
V120MA1A/S - V430MA3A
50
20
10
5
2
1
0.5
0.2
0.1
2
10
102
103
DISC SIZE 3mm
V18MA1A - V100MA4B
1
104
105
INDEFINITE
106
20
100
1,000
10,000
IMPULSE DURATION (μs)
V18MA - V100MA
NOTE: If pulse ratings are exceeded, a shift of V
N(DC) (at specified current) of more than
+/-10% could result. This type of shift, which normally results in a decrease of V
N(DC), may
result in the device not meeting the original published specifications, but it does not
prevent the device from continuing to function, and to provide ample protection.
Figure 1
Figure 2
Figure 3
Figure 4


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