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SVSP0E685M Datasheet(PDF) 11 Page - NEC |
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SVSP0E685M Datasheet(HTML) 11 Page - NEC |
11 / 16 page 11 SVS SERIES GUIDE TO APPLICATIONS FOR TANTALUM CHIP CAPACITORS The failure of the solid tantalum capacitor is mostly classified into a short-circuiting mode and a large leakage current mode. Refer to the following for reliable circuit design. 1. Expecting Reliability SVS series tantalum chip capacitors are typically applied to decoupling, blocking, bypassing and filtering. The SVS series has a very high reliability (low failure rate) in the field. For example, the maximum field failure rate of an SVS series capacitor with a DC rated voltage of 16 V is 0.0004% / 1000 hour (4 Fit) at an applied voltage of 5 V, operating temperature of 25˚C and series resistance of 3 Ω. The maximum failure rate in the field is estimated by the following expression : λ : Maximum field failure rate λ0 : 1%/1000 hour (The failure rate of the SVS series at the full DC rated voltage at operating temperature of 85˚C and series resistance of 3 Ω.) V : Applied voltage in actual use V0 : DC Rated voltage T : Operating temperature in actual use T0 : 85˚C 120 10 2 7 4 2 10 1 7 4 2 10 0 7 4 2 10 –1 7 0.2 0.1 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 4 2 10 –2 7 4 2 10 –3 7 4 2 10 –4 7 4 2 10 –5 110 100 90 80 70 60 50 40 30 20 The nomograph is provided for quick estimation of maximum field failure rates. Connect operating temperature T and applied voltage ratio V/ V0 of interest with a straight line. The failure rate multiplier F is given at the inter- section of this line with the model scale. The failure rate is obtained as λ = λ0•F. Examples : Given V/ V0 = 0.4 and T = 45˚C. read F = 4 × 10–3 Hence, λ = 0.004%/1000 hour (40 Fit). Given V/ V0 = 0.3 and T = 25˚C, read F = 4 × 10–4 Hence, λ = 0.0004%/1000 hour (4 Fit). V V0 λ = λ 0 3 × 2 T-T0 10 |
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