10. Notes on Using Super Capacitor
(Electric Double-Layer Capacitor)
1. Circuitry design
1.1 Useful life
The electrical double layered capacitor (super capacitor) uses electrolyte and is sealed with rubber etc. Water in the
electrolyte can evaporate in use over long periods at high temperatures, thus reducing electrostatic capacity which in turn will
create greater internal resistance. The characteristics of the super capacitor can vary greatly depending on the environment
it is used in. Therefore, controlling the usage environment will ensure prolonged life of the part.
Basic breakdown mode is an open mode due to increased internal resistance.
1.2 Fail rate in the field
Based on field data, the fail rate is calculated at approx. 0.006Fit. We estimate that unreported failures are ten times this
amount. Therefore, we assume that the fail rate is below 0.06Fit.
1.3 Voltage application when maximum usable voltage is exceeded
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) in electrical circuits
As super capacitors contain a high level of internal resistance, they are not recommended for use as electrical smoothing
capacitors in electrical circuits.
Performance may be compromised, and in some cases leakage or damage may occur if a super capacitor is used in ripple
absorption.
1.5 Series connections
As applied voltage balance to each super capacitor is lost when used in series connection, excess voltage may be applied to
some super capacitors, 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 super capacitor (partial
pressure resistor/voltage divider) when using super capacitors in series connection.
Also, arrange super capacitors so that the temperature between each capacitor will not vary.
1.6 Outer sleeve insulation
The outer sleeve wrapped around the super capacitor indicates that it is sealed, however the outer sleeve is not guaranteed
for insulation purposes. Therefore, it cannot be used where insulation is necessary.
1.7 Polar characteristics
The super capacitor 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.
1.8 Use next to heat emitters
Useful life of the super capacitor will be significantly affected if used near heat emitting items (coils, power transistors, and
posistors etc) where the super capacitor itself may become heated.
1.9 Usage environment
This device cannot be used in any acidic, alkaline or similar type of environment.
36 Super Capacitors Vol.12
●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
2010.11.8 9565S C A VOL12E
5秒后页面跳转
STM32H743技术深度剖析与应用案例探索
LM321中文资料解析：引脚功能介绍、技术特点、技术特性分析
74HC14芯片资料介绍：性能特性分析、引脚介绍
LM1875芯片手册：功放参数分析、引脚说明、电路设计要点
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
