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V20P75P Datasheet(PDF) 4 Page - Littelfuse |
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V20P75P Datasheet(HTML) 4 Page - Littelfuse |
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4 / 12 page  © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 11/04/15 Metal-Oxide Varistors (MOVs) Radial Leaded Varistors > LV UltraMOVTM Varistor Series Current Energy and Power Dissipation Ratings 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100110 120130 140150 AMBIENTTEMPERATURE ( oC) FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE Figure 1A - Power Derating for Epoxy Coated 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 100110 120130 140150 AMBIENTTEMPERATURE ( oC) Figure 1B - Power Derating for Phenolic Coated T1 T2 100 50 0 O1 TIME O1 = VIRTUAL ORIGIN OFWAVE t1 = VIRTUAL FRONT TIME = 1.25 x t (IMPULSE DURATION) t = TIME FROM 10% TO 90% OF PEAK t2 = VIRTUALTIME TO HALFVALUE EXAMPLE: FOR AN 8/20 s CURRENT WAVEFORM 8s = t1 = VIRTUAL FRONT TIME 20 s = t2 = VIRTUALTIME TO HALFVALUE FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM FOR CLAMPING VOLTAGE T Peak Pulse CurrentTest Waveform for Clamping Voltage 0 1 = Virtual Origin of Wave T = Time from 10% to 90% of Peak T 1 = Rise Time = 1.25 x T T 2 = Decay Time Example - For an 8/20µs Current Waveform: 8µs = T 1 = Rise Time 20µs = T 2 = Decay Time Figure 2 For applications exceeding 85ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown below. For applications exceeding 125ºC ambient temperature, the peak surge current and energy ratings must be reduced as shown below. |
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