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V131CA32 Datasheet(PDF) 3 Page - Littelfuse |
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V131CA32 Datasheet(HTML) 3 Page - Littelfuse |
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3 / 8 page  116 www .littelfuse .com Varistor Products CA Varistor Series High Energy Industrial Disc Power Dissipation Ratings Should transients occur in rapid succession, the average power dissipation result 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 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. V751CA32 V751CA40 V751CA60 32 40 60 750 970 700 1050 2600 25000 40000 70000 1080 1200 1320 2050 2000 1880 800 1800 3500 V881CA60 60 880 1150 3200 70000 1290 1500 1650 2340 2700 V112CA60 V142CA60 V172CA60 V202CA60 V242CA60 V282CA60 60 60 60 60 60 60 1100 1400 1700 2000 2400 2800 1400 1750 2150 2500 3000 3500 3800 5000 6000 7500 8600 10000 70000 70000 70000 70000 70000 70000 1620 2020 2500 2970 3510 4230 1800 2200 2700 3300 3900 4700 2060 2550 3030 3630 4290 5170 2940 3600 4300 5200 6200 7400 2200 1800 1500 1200 1000 800 NOTE: Average power dissipation of transients not exceed 1.5W, 2.0W and 2.5W for model 32mm, 40mm and 60mm, respectively. MODEL NUMBER SIZE MAXIMUM RATINGS (85 oC) SPECIFICATIONS (25oC) CONTINUOUS TRANSIENT VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLT VC AT 200A CURRENT (8/20µs) TYPICAL CAPACI- TANCE VRMS VDC ENERGY (2ms) PEAK CURRENT (8/20µs) VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VC f = 1MHz (mm) (V) (V) (J) (A) (V) (V) (V) (V) (pF) 1. Peak current applies to applications rated up to 115V . Peak Current is 30kA for applications greater than 115V . 2. Peak current applies to applications rated up to 132V . Peak Current is 30kA for applications greater than 132V . RMS RMS RMS RMS 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 8/20µs Current Waveform: 8µs = T1 = Virtual Front Time 20µs = T2 = Virtual Time to Half Value Device Ratings and Specifications (continued) |
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