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V251DHB34 Datasheet(PDF) 4 Page - Littelfuse |
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V251DHB34 Datasheet(HTML) 4 Page - Littelfuse |
4 / 5 page 112 www .littelfuse .com Varistor Products High Energy Industrial Power Dissipation Ratings Should transients occur in rapid succession, the average power dissipation result 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 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 1000 10000 0.001 0.01 0.1 1 10 100 10000 100000 Maximum Clamping Voltage DHB34 Series 110 to 750V AC Rating TA = -55 C to 85C Current - AMPS Voltage Volts V751 V681 V661 V571 V551 V511 V391 V351 V331 V321 V271 V251 V201 V181 V151 V141 V111 V131 V301 V481 V441 V421 100 1000 DHB34 Varistor Series FIGURE 3. CLAMPING VOLTAGE FOR DHB34 SERIES |
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