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V131NA34 Datasheet(PDF) 3 Page - Littelfuse |
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V131NA34 Datasheet(HTML) 3 Page - Littelfuse |
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3 / 5 page  124 www .littelfuse .com Varistor Products NA Varistor Series High Energy Industrial Square Disc 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. The operating values must be derated as shown in Figure 1. Transient V-I Characteristics Curves 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 FIGURE 3. CLAMPING VOLTAGE FOR V131NA34 - V751NA34 10000 1000 100 CURRENT (A) V751NA34 V131NA34 V321NA34 V511NA34 V481NA34 V571NA34 V661NA34 TA = -55 oC TO 85oC MAXIMUM CLAMPING VOLTAGE VARISTOR SIZE 34mm 130 TO 750 VM(AC) RATING V271NA34 V251NA34 V151NA34 V421NA34 -5 -4 1E-3 0.01 0.1 1 10 100 1,000 10,000 100,000 |
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