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V33ZA1 Datasheet(PDF) 5 Page - Littelfuse |
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V33ZA1 Datasheet(HTML) 5 Page - Littelfuse |
5 / 14 page 71 www .littelfuse .com 2 Varistor Products Low to Medum Voltage, Radial Lead ZA Varistor Series 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. 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. 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 8/20 µs Current Waveform: 8 µs = T1 = Virtual Front Time 20 µs = T2 = Virtual Time to Half Value FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05(P) - V68ZA05(P) 600 500 400 300 200 100 90 80 70 60 50 40 30 20 PEAK AMPERES (A) 10-2 10-1 100 101 102 103 MAX CLAMPINGVOLTAGE MODEL SIZE 5mm 8 TO 68VN(DC) RATING TA = -55 oC TO 85oC 10 V68ZA05(P) V56ZA05(P) V47ZA05(P) V39ZA05(P) V33ZA05(P) V27ZA05(P) V22ZA05(P) V18ZA05(P) V12ZA05(P) V8ZA05(P) 10-3 FIGURE 4. CLAMPINGVOLTAGE FOR V82ZA05(P) - V33ZA05(P) 2000 1000 500 200 PEAK AMPERES (A) 0.01 0.1 1 10 100 1000 100 0.001 0.0001 V100ZA05(P) V82ZA05(P) MAX CLAMPING VOLTAGE MODEL SIZE 5mm 82 TO 330VN(DC) RATING TA = -55 oC TO 85oC V330ZA05(P) V270ZA05(P) V240ZA05(P) V220ZA05(P) V205ZA05(P) V180ZA05(P) V150ZA05(P) V120ZA05(P) Transient V-I Characteristics Curves Pb RoHS |
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