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V131HB34 Datasheet(PDF) 3 Page - Littelfuse

Part No. V131HB34
Description  Varistor Products - High Energy Industrial
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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V131HB34 Datasheet(HTML) 3 Page - Littelfuse

   
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HB34 Varistor Series
Varistor Products
High Energy Industrial
87
www .littelfuse .com
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation result 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. The operating values must be derated as shown
in Figure 1.
Transient V-I Characteristics Curves
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 8/20
µs Current Waveform:
8
µs = T1 = Virtual Front Time
20
µs = T2 = Virtual Time to Half Value
FIGURE 3. CLAMPING VOLTAGE FOR V131HB34 - V751HB34
10000
1000
100
CURRENT (A)
V751HB34
V131HB34
V321HB34
V511HB34
V481HB34
V571HB34
V661HB34
TA = -55
oC TO 85oC
MAXIMUM CLAMPINGVOLTAGE
VARISTOR SIZE 34mm
130 TO 750 VM(AC) RATING
V271HB34
V251HB34
V151HB34
V421HB34
-5
-4
1E-3
0.01
0.1
1
10
100
1,000
10,000
100,000
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