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V47ZA3 Datasheet(PDF) 5 Page - Littelfuse

Part # V47ZA3
Description  Varistor Products - Low to Medum Voltage, Radial Lead
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Manufacturer  LITTELFUSE [Littelfuse]
Direct Link  http://www.littelfuse.com
Logo LITTELFUSE - Littelfuse

V47ZA3 Datasheet(HTML) 5 Page - Littelfuse

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Varistor Products
Low to Medum Voltage, Radial Lead
ZA Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation
required 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. 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.
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 8/20
µs Current Waveform:
8
µs = T1 = Virtual Front Time
20
µs = T2 = Virtual Time to Half Value
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05(P) - V68ZA05(P)
600
500
400
300
200
100
90
80
70
60
50
40
30
20
PEAK AMPERES (A)
10-2
10-1
100
101
102
103
MAX CLAMPINGVOLTAGE
MODEL SIZE 5mm
8 TO 68VN(DC) RATING
TA = -55
oC TO 85oC
10
V68ZA05(P)
V56ZA05(P)
V47ZA05(P)
V39ZA05(P)
V33ZA05(P)
V27ZA05(P)
V22ZA05(P)
V18ZA05(P)
V12ZA05(P)
V8ZA05(P)
10-3
FIGURE 4. CLAMPINGVOLTAGE FOR V82ZA05(P) - V33ZA05(P)
2000
1000
500
200
PEAK AMPERES (A)
0.01
0.1
1
10
100
1000
100
0.001
0.0001
V100ZA05(P)
V82ZA05(P)
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
82 TO 330VN(DC) RATING
TA = -55
oC TO 85oC
V330ZA05(P)
V270ZA05(P)
V240ZA05(P)
V220ZA05(P)
V205ZA05(P)
V180ZA05(P)
V150ZA05(P)
V120ZA05(P)
Transient V-I Characteristics Curves
Pb
RoHS


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