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V571CA40 Datasheet(PDF) 3 Page - Littelfuse

Part No. V571CA40
Description  Varistor Products - High Energy Industrial Disc
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Maker  LITTELFUSE [Littelfuse]
Homepage  http://www.littelfuse.com
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V571CA40 Datasheet(HTML) 3 Page - Littelfuse

   
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Varistor Products
CA Varistor Series
High Energy Industrial Disc
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation result 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.
V751CA32
V751CA40
V751CA60
32
40
60
750
970
700
1050
2600
25000
40000
70000
1080
1200
1320
2050
2000
1880
800
1800
3500
V881CA60
60
880
1150
3200
70000
1290
1500
1650
2340
2700
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
60
60
60
60
60
60
1100
1400
1700
2000
2400
2800
1400
1750
2150
2500
3000
3500
3800
5000
6000
7500
8600
10000
70000
70000
70000
70000
70000
70000
1620
2020
2500
2970
3510
4230
1800
2200
2700
3300
3900
4700
2060
2550
3030
3630
4290
5170
2940
3600
4300
5200
6200
7400
2200
1800
1500
1200
1000
800
NOTE: Average power dissipation of transients not exceed 1.5W, 2.0W and 2.5W for model 32mm, 40mm and 60mm, respectively.
MODEL
NUMBER
SIZE
MAXIMUM RATINGS (85 oC)
SPECIFICATIONS (25oC)
CONTINUOUS
TRANSIENT
VARISTOR VOLTAGE AT
1mA DC TEST CURRENT
MAX
CLAMPING
VOLT VC AT
200A
CURRENT
(8/20µs)
TYPICAL
CAPACI-
TANCE
VRMS
VDC
ENERGY
(2ms)
PEAK
CURRENT
(8/20µs)
VM(AC)
VM(DC)
WTM
ITM
MIN
VN(DC)
MAX
VC
f = 1MHz
(mm)
(V)
(V)
(J)
(A)
(V)
(V)
(V)
(V)
(pF)
1. Peak current applies to applications rated up to 115V
. Peak Current is 30kA for applications greater than 115V
.
2. Peak current applies to applications rated up to 132V
. Peak Current is 30kA for applications greater than 132V
.
RMS
RMS
RMS
RMS
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
AMBIENT TEMPERATURE ( 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
Device Ratings and Specifications (continued)


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