DZ-2R5D665Z6T Elna America, DZ-2R5D665Z6T Datasheet - Page 113

• Manufacturer Part Number: DZ-2R5D665Z6T
• Description: CAP DOUBLE LAYER 6.6F 2.5V RAD
• Manufacturer: Elna America
• Series: DZr

Specifications of DZ-2R5D665Z6T

• Capacitance: 6.6F
• Voltage - Rated: 2.5V
• Tolerance: -20%, +80%
• Esr (equivalent Series Resistance): 200.0 mOhm
• Lifetime @ Temp.: 1000 Hrs @ 70°C
• Mounting Type: Through Hole
• Package / Case: Radial, Can
• Lead Spacing: 0.197" (5.00mm)
• Height: 0.906" (23.00mm)
• Size / Dimension: 0.492" Dia (12.50mm)
• Operating Temperature: -25°C ~ 70°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TECHNICAL NOTE
1 General Description of Aluminum Elec-
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-
tric, electric charge can be stored proportional to the
voltage.
C. called the capacitance of capacitor, is expressed by
the following expression with the electrode area S[m
the electrode spacing t [m] and the dielectric constant
of dielectric “
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.
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.
The schematic cross section of the aluminum electrol-
ytic capacitor is as in Fig.1-2.
CAT.No.2008/2009E ( 2008.10.1 )
Aluminum oxide film
Mylar
Mica
ε
trolytic Capacitors
Dielectric
Q＝C・V
Q : Quantity of electricity (C)
0 : Dielectric constant in vacuum ( ＝ 8.85 × 10
C : Capacitance (F)
V : Voltage (V)
ε
Dielectric Constant
”
:
7 to 8
6 to 8
C[F] ＝
3.2
S
Fig.1-1
Table 1
ε
0・
Porcelain (ceramic)
Polystyrene
Tantalum oxide film
ε
Dielectric
・
——
S
t
t
Dielectric Constant
10 to 120
10 to 20
2.5
­12
F/m)
2
],
ALUMINUM ELECTROLYTIC
CAPACITORS
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
by Arrhenius’ equation.
The effects to the life by derating of the applied voltage
etc. are neglected because they are small compared
to that by the temperature.
1-2 Equivalent Circuit of the Capacitor
The electrical equivalent circuit of the aluminum elec-
trolytic capacitor is as presented in Fig. 2.
R1 : Resistance of terminal and electrode
R2 : Resistances of anodic oxide film and electrolyte
R3 : Insulation resistance because of defective anodic
D1 : Oxide semiconductor of anode foil
C1 : Capacity of anode foil
C2 : Capacity of cathode foil
2 About the Life of an Aluminum Electrolytic
2-1 Estimation of life with minimal ripple current
(negligible).
L : Inductance caused by terminals, electrodes, etc.
Anodic oxide film
L＝ L
Capacitor
Where L : Life at temperature T
oxide film
Anode foil
(True cathode)
0
× 2
NOTE
Design, Specifications are subject to change without notice.
Ask factory for technical specifications before purchase and/or use.
Electrolyte
R1
L
0
)
: Life at temperature T
T
——
10
10
0
−T
D1
R3
)
Fig.1-2
C1
………………(1)
R2
Separator sheet
impregnated with electrolyte
C2
Cathode foil
(Virtually, electrode for
cathode extraction)
Natural air oxide film
0
L
®