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FA1A474ZF Datasheet(PDF) 10 Page - Kemet Corporation |
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FA1A474ZF Datasheet(HTML) 10 Page - Kemet Corporation |
10 / 12 page 10 © KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 • 864-963-6300 • www.kemet.com S6018_FA • 3/30/2017 Supercapacitors – FA Series Notes on Using Supercapacitors or Electric Double-Layer Capacitors (EDLCs) 1. Circuitry Design 1.1 Useful life The FC Series Supercapacitor (EDLC) uses an electrolyte in a sealed container. Water in the electrolyte can evaporate while in use over long periods of time at high temperatures, thus reducing electrostatic capacity which in turn will create greater internal resistance. The characteristics of the supercapacitor can vary greatly depending on the environment in which it is used. Basic breakdown mode is an open mode due to increased internal resistance. 1.2Failrateinthefield Basedonfielddata,thefailrateiscalculatedatapproximately0.006Fit.Weestimatethatunreportedfailuresareten times this amount. Therefore, we assume that the fail rate is below 0.06 Fit. 1.3 Exceeding maximum usable voltage Performance may be compromised and in some cases leakage or damage may occur if applied voltage exceeds maximum working voltage. 1.4 Use of capacitor as a smoothing capacitor (ripple absorption) As supercapacitors contain a high level of internal resistance, they are not recommended for use as smoothing capacitors in electrical circuits. Performance may be compromised and, in some cases, leakage or damage may occur if a supercapacitor is used in ripple absorption. 1.5 Series connections As applied voltage balance to each supercapacitor is lost when used in series connection, excess voltage may be applied to some supercapacitors, which will not only negatively affect its performance but may also cause leakage and/or damage. Allow ample margin for maximum voltage or attach a circuit for applying equal voltage to each supercapacitor (partial pressure resistor/voltage divider) when using supercapacitors in series connection. Also, arrange supercapacitors so that the temperature between each capacitor will not vary. 1.6 Case Polarity The supercapacitor is manufactured so that the terminal on the outer case is negative (-). Align the (-) symbol during use. Even though discharging has been carried out prior to shipping, any residual electrical charge may negatively affect other parts. 1.7 Use next to heat emitters Usefullifeofthesupercapacitorwillbesignificantlyaffectedifusednearheatemittingitems(coils,powertransistors and posistors, etc.) where the supercapacitor itself may become heated. 1.8 Usage environment This device cannot be used in any acidic, alkaline or similar type of environment. |
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