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V39ZA3 Datasheet(PDF) 5 Page - Harris Corporation |
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V39ZA3 Datasheet(HTML) 5 Page - Harris Corporation |
5 / 12 page 4-38 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. 1. 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 Transient V-I Characteristics Curves FIGURE 3. CLAMPING VOLTAGE FOR V8ZA05 - V68ZA05 FIGURE 4. CLAMPING VOLTAGE FOR V82ZA05 - V330ZA05 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 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 CLAMPING VOLTAGE MODEL SIZE 5mm 8 TO 68VN(DC) RATING TA = -55 oC TO 85oC 10 V68ZA05 V56ZA05 V47ZA05 V39ZA05 V33ZA05 V27ZA05 V22ZA05 V18ZA05 V12ZA05 V8ZA05 10-3 2000 1000 500 200 PEAK AMPERES (A) 0.01 0.1 1 10 100 1000 100 0.001 0.0001 V330ZA05 V270ZA05 V240ZA05 V220ZA05 V205ZA05 V180ZA05 V150ZA05 V120ZA05 V10 0ZA05 V82ZA05 MAX CLAMPING VOLTAGE MODEL SIZE 5mm 82 TO 330VN(DC) RATING TA = -55 oC TO 85oC ZA Series |
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Similar Description - V39ZA3 |
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