SIOV Metal Oxide Varistors - DEMAR

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General Technical Information 7a 7b Figures 7a and b Tolerance limits of a metal oxide varistor with <strong>SIOV</strong>-S14K14 taken as example 24 Siemens Matsushita Components
General Technical Information 1.7 Terms and descriptions 1.7.1 Operating voltage The product tables specify maximum AC and DC operating voltages. These figures should only be exceeded by transients. Automotive types, however, are rated to withstand excessive voltage (jump start) for up to 5 minutes. The leakage current at specified operating voltage is negligible. The maximum permissible AC operating voltage is used to classify the individual voltage ratings within the type series. In most applications the operating voltage is a given parameter, so the varistors in the product tables are arranged according to maximum permissible operating voltage to facilitate comparison between the individual varistor sizes. 1.7.2 Surge current Short-term current flow – especially when caused by overvoltage – is referred to as surge current. The maximum surge current that can be handled by a metal oxide varistor depends on amplitude, pulse duration and number of pulses applied over device lifetime. The ability of a varistor to withstand a single pulse of defined shape is characterized by the maximum non-repetitive surge current specified in the product tables (single pulse, t r ≤ 20 µs). If pulses of longer duration or multiple pulses are applied, the surge current must be derated as described in section 1.8. Maximum surge current The maximum non-repetitive surge current is defined by an 8/20 µs waveform (rise time 8 µs/decay time to half value 20 µs) according to IEC 60 as shown in figure 8a. This approximates a rectangular wave of 20 µs. The derating curves of the surge current, defined for rectangular waveforms, consequently show a knee between horizontal branch and slope at 20 µs. 1.7.3 Energy absorption The energy absorption of a varistor is correlated with the surge current by t W = 1 t0 ∫ v()it t ()dt (equ. 6) where v (t) is the voltage drop across the varistor during current flow. Figure 30 on page 66 illustrates the electrical performance for the absorption of 100 J in the case of <strong>SIOV</strong>-S20K14AUTO. Siemens Matsushita Components 25
Page 1 and 2: SIOV Metal Oxide Varistors
Page 3 and 4: Type Survey SMD varistors Standard
Page 5 and 6: Type Survey Disk varistors Standard
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SIOV Metal Oxide Varistors - DEMAR

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