V250LA40B View Datasheet(PDF) -
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Varistor Products
Line Voltage Operation, Radial Lead
LA Varistor Series
Device Ratings and Specifications (Continued)
MAXIMUM RATING (85 oC)
SPECIFICATIONS (25oC)
CONTINUOUS
TRANSIENT
MAXIMUM TYPICAL
PEAK VARISTOR VOLT- CLAMPING CAPACI-
PART
MODEL
SIZE
DISC
DIA.
DEVICE
MODEL
NUMBER
BRAND-
VRMS
VM(AC)
ENERGY CURRENT
VDC 10 x 1000µs 8 x 20µs
VM(DC)
WTM
ITM
AGE AT 1mA DC
TEST CURRENT
VNOM
MIN
VNOM
MAX
VOLTAGE
8 x 20µs
VC IPK
TANCE
f = 1MHz
C
NUMBER
(mm)
ING
(V)
(V)
(J)
V660LA10
10 660L
660
850
70
(A)
(V)
(V) (A)
(pF)
2500
940
1210 1820 25
70
2
V660LA50A
14 660L50
660
850
140
4500
940
1210 1820 50
200
V660LA100B
20 660L100
660
850
250
6500
940
1100 1650 100
400
V1000LA80A
14 1000L80
1000 1200
220
4500
1425 1800 2700 50
130
V1000LA160B
20 1000L160 1000 1200
360
6500
1425 1600 2420 100
250
NOTE: Average power dissipation of transients not to exceed 0.25W, 0.4W, 0.6W or 1W for model sizes 7mm, 10mm, 14mm and 20mm, respectively.
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 Figure 1. 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.
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. CURRENT, ENERGY AND POWER DERATING
CURVE
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
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
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