V130LA1P_10 Datasheet, PDF (4/13 Pages) Littelfuse – Radial Lead Varistors

Varistor Products
Radial Lead Varistors > LA Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average
power dissipation is 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 of a MOV need to be derated
at high temperatures as shown in the diagram below.
Because varistors only dissipate a relatively small amount
of average power they are not suitable for repetitive
applications that involve substantial amounts of average
power dissipation.
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
AMBIENT TEMPERATURE ( ^oC)
Figure 1
Peak Pulse Current Test Waveform
100
90
50
10
O₁
Figure 2
T
T₁
T₂
TIME
0 = Virtual Origin of Wave
1
T = Time from 10% to 90% of Peak
T₁ = Rise Time = 1.25 x T
T₂ = Decay Time
Example - For an 8/20 μs Current Waveform:
8μs = T = Rise Time
1
20μs = T = Decay Time
2
LA Varistor Series
Revision: August 4, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/la.html for current information.