UltraMOV Series
Device Ratings and Specifications
CONTINUOUS
RMS
VOLTS
DEVICE
MODEL
NUMBER
BRANDING
10V550
14V550
20V550
10V625
14V625
20V625
V
M(AC)
(V)
550
550
550
625
625
625
DC
VOLTS
V
M(DC)
(V)
745
745
745
825
825
825
ENERGY
2ms
W
TM
(J)
90
180
360
100
200
400
(Continued)
SPECIFICATIONS (25
o
C)
VARISTOR
VOLTAGE AT 1mA
DC TEST CURRENT
V
NOM
MIN
(V)
901
901
901
900
900
900
1001
1001
1001
1100
1100
1100
V
NOM
MAX
MAXIMUM
CLAMPING
VOLTAGE 8 x 20µs
V
C
(V)
1500
1500
1500
1650
1650
1650
I
PK
(A)
25
50
100
25
50
100
TYPICAL
CAPACI-
TANCE
f = 1MHz
(pF)
100
180
300
90
160
250
MAXIMUM RATING (85
o
C)
TRANSIENT
PEAK CURRENT
8 x 20µs
I
TM
I
TM
2 x PULSE 1 x PULSE
(A)
2500
4500
6500
2500
4500
6500
(A)
3500
6000
10000
3500
6000
10000
MODEL
NUMBER
V10E550
V14E550
V20E550
V10E625
V14E625
V20E625
NOTE:
1. Average power dissipation of transients should not exceed 0.25W, 0.4W, 0.6W and 1.0W for 7mm, 10mm, 14mm, and 20mm model sizes,
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. 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.
PERCENT OF RATED VALUE
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 (
o
C)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
PERCENT OF PEAK VALUE
100
90
50
10
O
1
T
T
1
T
2
TIME
O
1
= Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front time = 1.25
•
t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T
1
= Virtual Front Time
20µs = T
2
= Virtual Time to Half Value
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
4-8
RENESAS [ RENESAS TECHNOLOGY CORP ]
