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| 型号： | DC-2R5E224U-E |
| 厂商： | Elna America |
| 文件页数： | 113/145页 |
| 文件大小： | 0K |
| 描述： | CAP SUPER 220MF 2.5V COIN SMD |
| 产品目录绘图： | DC Series Front DC Series Side |
| 标准包装： | 200 |
| 系列： | DC |
| 电容： | 220mF |
| 电压 - 额定： | 2.5V |
| 容差： | -20%，+80% |
| ESR（等效串联电阻）： | 100 欧姆 |
| 寿命@温度： | 70°C 时为 1000 小时 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 币形，细型端子 - 同侧 |
| 引线间隔： | 0.079"（2.00mm） |
| 包装： | 散装 |
| 尺寸/尺寸： | 0.268" 直径（6.80mm） |
| 高度 - 座高（最大）： | 0.102"（2.60mm） |
| 工作温度： | -25°C ~ 70°C |
| 产品目录页面： | 1912 (CN2011-ZH PDF) |
| 其它名称： | 604-1006 |
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TECHNICAL NOTE
1 General Description of Aluminum Elec-
trolytic Capacitors
1-1 The Principle of Capacitor
The principle of capacitor can be presented by the
principle drawing as in Fig.1-1.
When a voltage is applied between the metal elec-
trodes placed opposite on both surfaces of a dielec-
ALUMINUM ELECTROLYTIC
CAPACITORS
Anode foil
Separator sheet
impregnated with electrolyte
Cathode foil
(Virtually, electrode for
cathode extraction)
?
tric, electric charge can be stored proportional to the
voltage.
Q ＝ C ? V
Q : Quantity of electricity (C)
Anodic oxide film
Electrolyte
(True cathode)
Fig.1-2
Natural air oxide film
V : Voltage (V)
C : Capacitance (F)
1-2 Equivalent Circuit of the Capacitor
The electrical equivalent circuit of the aluminum elec-
trolytic capacitor is as presented in Fig. 2.
t
S
D1
R1
C1
R2
C2
L
R3
Fig.1-1
C[F] ＝ ε 0 ? ε ? — t —
C. called the capacitance of capacitor, is expressed by
the following expression with the electrode area S[m 2 ],
the electrode spacing t [m] and the dielectric constant
of dielectric “ ε ” :
S
ε 0 : Dielectric constant in vacuum ( ＝ 8.85 × 10 - 12 F/m)
The dielectric constant of an aluminum oxide film is
7 to 8. Larger capacitances can be obtained by en-
larging the electrode area S or reducing t.
Table 1-1 shows the dielectric constants of typical diel-
ectrics used in the capacitor. In many cases, capacitor
names are determined by the dielectric material used,
for example, aluminum electrolytic capacitor, tantalum
capacitor, etc.
Table 1
R1 : Resistance of terminal and electrode
R2 : Resistances of anodic oxide film and electrolyte
R3 : Insulation resistance because of defective anodic
oxide film
D1 : Oxide semiconductor of anode foil
C1 : Capacity of anode foil
C2 : Capacity of cathode foil
L : Inductance caused by terminals, electrodes, etc.
2 About the Life of an Aluminum Electrolytic
Capacitor
2-1 Estimation of life with minimal ripple current
(negligible).
Generally, the life of an aluminum electrolytic capacitor
is closely related with its ambient temperature and the
life will be approximately the same as the one obtained
Dielectric
Dielectric Constant
Dielectric
Dielectric Constant
by Arrhenius’ equation.
T ——
Aluminum oxide film
Mylar
Mica
7 to 8
3.2
6 to 8
Porcelain (ceramic)
Polystyrene
Tantalum oxide film
10 to 120
2.5
10 to 20
L ＝ L 0 × 2
)
0 ? T
10
)
………………(1)
Where L : Life at temperature T
Although the aluminum electrolytic capacitor is small,
it has a large capacitance. It is because the electrode
area is roughened by electrochemical etching, en-
larging the electrode area and also because the die-
lectric is very thin.
L 0 : Life at temperature T 0
The effects to the life by derating of the applied voltage
etc. are neglected because they are small compared
to that by the temperature.
The schematic cross section of the aluminum electrol-
ytic capacitor is as in Fig.1-2.
NOTE
CAT.No.2008/2009E(2008.10.1)
Design, Speci?cations are subject to change without notice.
Ask factory for technical speci?cations before purchase and/or use.
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