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V131DA40 Datasheet(PDF) 3 Page - Littelfuse

Part No. V131DA40
Description  Varistor Products - High Energy Industrial
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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V131DA40 Datasheet(HTML) 3 Page - Littelfuse

   
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Varistor Products
High Energy Industrial
DA/DB Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipa-
tion 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 in Figure 1. 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.
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
80
90
100
110
120
130
140
150
AMBIENTTEMPERATURE ( oC)
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O1
T
T1
T2
TIME
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front time = 1.25 • t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T1 = Virtual Front Time
20µs = T2 = Virtual Time to Half Value
Transient V-I Characteristics Curve
FIGURE 3. CLAMPING VOLTAGE FOR V131DA40, V131DB40 - V751DA40, V751DB40
200
6,000
5,000
4,000
3,000
1,000
900
800
700
600
500
400
300
10-2
10-1
100
101
102
103
104
105
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 40mm
130 TO 750 VM(AC) RATING
TA = -55
oC to 85oC
V421DA/DB40
V151DA/DB40
V751DA/DB40
PEAK AMPERES (A)
V131DA/DB40
V321DA/DB40
V271DA/DB40
V251DA/DB40
V511DA/DB40
V481DA/DB40
V571DA/DB40
V661DA/DB40
2,000


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