V33ZS1P Datasheet, PDF (5/14 Pages) Littelfuse – Low to Medum Voltage, Radial Lead

Varistor Products
Low to Medum Voltage, Radial Lead
RoHS ^Pb _{ZA Varistor Series}
Power Dissipation Ratings
100
Should transients occur in rapid succession, the average power dissipation
90
required is simply the energy (watt-seconds) per pulse times the number
80
of pulses per second. The power so developed must be within the
specifications shown on the Device Ratings and Specifications table for
70
the specific device. Furthermore, the operating values need to be derated
60
at high temperatures as shown in Figure 1. Because varistors can only
50
dissipate a relatively small amount of average power they are, therefore,
not suitable for repetitive applications that involve substantial amounts of
40
average power dissipation.
30
20
2
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
600
500
MAX CLAMPINGVOLTAGE
MODEL SIZE 5mm
400
8 TO 68V_N(DC) RATING
300 T_A = -55^oC TO 85^oC
200
100
90
80
70
60
V68ZA05(P)
V56ZA05(P)
V47ZA05(P)
50 V39ZA05(P)
40
V33ZA05(P)
V27ZA05(P)
30
V22ZA05(P)
V18ZA05(P)
20 ^V12ZA05(P)
V8ZA05(P)
10
10^-3
10^-2
10^-1
10⁰
10¹
10²
10³
PEAK AMPERES (A)
FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05(P) - V68ZA05(P)
2000
1000
500
V330ZA05(P)
V270ZA05(P)
V240ZA05(P)
V220ZA05(P)
V205ZA05(P)
V180ZA05(P)
V150ZA05(P)
V120ZA05(P)
MAX CLAMPING VOLTAGE
MODEL SIZE 5mm
82
T_A
T=O-5353_o0CVT_{NO(DC85) o}RCATING
200
V1_V⁰₈⁰₂^Z_Z^A_A⁰₀⁵5^((PP))
100
0.0001 0.001
0.01 0.1
1
10
PEAK AMPERES (A)
100 1000
FIGURE 4. CLAMPINGVOLTAGE FOR V82ZA05(P) - V33ZA05(P)
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