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B45196T3157K309 Datasheet(PDF) 11 Page - Kemet Corporation |
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B45196T3157K309 Datasheet(HTML) 11 Page - Kemet Corporation |
11 / 13 page Cautions and warnings When using tantalum capacitors with a manganese dioxide coating, the following cautions and warnings should be taken into account: Polarity Because tantalum capacitors are polar capacitors, it is important to observe their polarity markings (positive pole on the anode, negative pole on the cathode). Any incorrect polarity resulting from the sum of the AC and DC voltage components must be smaller than or equal to the permitted polarity reversal voltage. To avoid reducing their reliability, this voltage may only occur for a short time, at most five times for a duration of one minute per hour. Voltage The maximum continuous voltage depends on the ambient temperature. Within the temperature range of 55 to +85 °C, the rated voltage is equal to the maximum continuous voltage. Between + 85 and + 125 °C the maximum continuous voltage must be reduced linearly from the full rated voltage to 2/3 of it (derating). At 150 °C (only B4519*P series) the voltage must be reduced to 1/2 and at 175 °C (only B4519*T series) to 1/3 of the rated voltage. Operation below the maximum continuous voltage has a positive effect on the capacitor’s failure rate. The maximum continuous voltage must not be exceeded . All unfavourable operating conditions (such as possible line overvoltages, unfavourable tolerances of the transformation ratio of the line transformer in the equipment, repeated overvoltages when the equipment is switched on, high ambient temperatures) must be taken into account when determining the operating voltage. The surge voltage is the maximum voltage (peak value) that may be applied to the capacitor for short periods, at most five times for a total duration of up to 1 minute per hour. The surge voltage must not be applied for periodic charging and discharging in the course of normal operation and cannot be part of the operating voltage. The permissible surge voltage for all capacitors in this data book is 1.3 x the rated voltage. The occurrence of voltage impulses (transient voltages) that exceed the surge voltage may lead to irreparable damage. Capacitance The actual capacitance of a capacitor can deviate from the rated capacitance by as much as the full magnitude of the tolerance at delivery. The capacitance varies with the temperature (at +125 °C +12% up to +20%) and decreases with increasing frequency. Tantalum chip capacitors B45196T, B45198T Performance, High Temperature 175 °C Page 11 of 13 Please read Important notes and Cautions and warnings at the end of this document. |
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