V39ZT1P Datasheet, PDF (4/14 Pages) Littelfuse – Lead–free, Halogen-Free and RoHS compliant

Varistor Products
Radial Lead Varistors > ZA Series
Phenolic Coating Option -- ZA Series Varistors for Hi-Temperature Operating Conditions:
• Phenolic coated ZA Series devices are available with improved maximum operating temperature of 125°C
• These devices also have improved temperature cycling performance capability
• Ratings and specifications are as per standard ZA Series except Hi–Pot
Encapsulation (Isolation Voltage Capability) = 500V
• To order: add 'X1347' to part number (e.g. V22ZA3PX1347)
• These devices are not UL, CSA, VDE or CECC certified
• Contact factory for further details
• Product marking:
LF 9
P22P3
Lead-Free,
YYWW
Halogen-Free
& RoHS Compliant
Indicator
Phenolic Coated
Option
Identifier
Current Energy and 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
Figure 1A - Power Derating for Epoxy Coated
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
AMBIENTTEMPERATURE ( ^oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
Peak Pulse Cu^Crr^Ue^Rn^Vt^ETest Waveform
device. The operating values of a MOV need to be derated
at high temperatures as shown above. Because varistors
only dissipate a relatively small amount of average power
they are not suitable for repetitive applications that involve
substantial amounts of average power dissipation.
Figure 1B - Power Derating for Phenolic Coated
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
AMBIENTTEMPERATURE ( ^oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
50
10
O₁
Figure 2
T
T₁
T₂
TIME
0₁ = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T₁ = Rise Time = 1.25 x T
T₂ = Decay Time
Example - For an 8/20 µs Current Waveform:
8µs = T₁ = Rise Time
20µs = T₂ = Decay 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:
8 s = T₁ = Virtual Front Time
© 2014 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 05/23/14