V130PA20A Datasheet, PDF (3/5 Pages) Littelfuse – Varistor Products - Base Mount

Varistor Products
Base Mount
PA 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.
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
Transient V-I Characteristics Curves
6,000
5,000
4,000
3,000
2,000
MAXIMUM CLAMPING VOLTAGE
“A” SUFFIX
V660PA80A
130 TO 660V_M(AC) RATING
T_A = -55^oC TO 85^oC
V575PA80A
V510PA80A
V480PA80A
V420PA80A
6,000
5,000
4,000
3,000
MAXIMUM CLAMPINGVOLTAGE
“C”SUFFIX
130 TO 660V_M(AC) RATING
T_A = -55^oC TO 85^oC
2,000
V660PA100C
V575PA80C
V510PA80C
V480PA80C
V420PA80C
1,000
900
800
700
600
A40A
500 _V320PA40A
400
V150PA20A
300
V130PA20A
200
10^-3
10^-2
V275PA40A
V250PA40A
10^-1
10⁰
10¹
10²
PEAK AMPERES (A)
10³ 10⁴
FIGURE 3. CLAMPING VOLTAGE FOR V130PA20A -
V660PA100A
1,000
900
800
700 V350PA40C
600
500
400 V320PA40C
300 ^V150PA20C
V275PA40C
V250PA40C
200 ^V130PA20C
10^-3
10^-2
10^-1
10⁰
10¹
10²
PEAK AMPERES (A)
10³ 10⁴
FIGURE 4. CLAMPING VOLTAGE FOR V130PA20C -
V660PA100C
134
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