DC-2R5D204T614 Elna America, DC-2R5D204T614 Datasheet - Page 114

• Manufacturer Part Number: DC-2R5D204T614
• Description: CAP DOUBLE LAYER .20F 2.5V COIN
• Manufacturer: Elna America
• Series: DCr

Specifications of DC-2R5D204T614

• Capacitance: 200mF
• Voltage - Rated: 2.5V
• Tolerance: -20%, +80%
• Esr (equivalent Series Resistance): 100.00 Ohm
• Lifetime @ Temp.: 1000 Hrs @ 70°C
• Mounting Type: Surface Mount
• Package / Case: Surface Mount - Coin Style
• Height: 0.083" (2.10mm)
• Size / Dimension: 0.268" Dia (6.80mm)
• Operating Temperature: -25°C ~ 70°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Spacing: -
• Other names: 604-1075

2-2 Estimation of life considering the ripple current.
The ripple current affects the life of a capacitor
because the internal loss (ESR) generates heat. The
generated heat will be :
With increase in the temperature of the capacitor:
The above equation (3) shows that the temperature of
a capacitor increases in proportion to the square of
the applied ripple current and ESR, and in inverse
proportion to the surface area. Therefore, the amount
of the ripple current determines the heat generation,
which affects the life. The value of Δ T varies de-
pending on the capacitor types and operating condi-
tions. The usage is generally desirable if Δ T remains
less than 5℃. The measuring point for temperature
increase due to ripple current is shown below ;
Test results:
(1) The life equation considering the ambient temper-
ature and the ripple current will be :
K : Ripple acceleration factor
T
T : Operating temperature (℃)
Δ T : Temperature increase at capacitor core
(2) The life equation based on the life with the rated
ripple current applied under the maximum guaranteed
temperature will be a conversion of the above equation
(4), as below :
NOTE
Design, Specifications are subject to change without notice.
Ask factory for technical specifications before purchase and/or use.
L ＝ Ld × 2
P ＝ I
Where Δ
Where l : Ripple current (Arms)
Δ T ＝
Where Ld : Life at DC operation (h)
2
R………………(2)
R : ESR (Ω)
̶
I
A
2
T : Temperature increase in the capacitor
R : ESR (Ω)
A : Surface area of the capacitor (cm
H : Radiation coefficient (Approx. 1.5 ∼ 2.0 ×
•
I : Ripple current (Arms)
•
0
R
H
)
: Upper category temperature (℃)
T
®
core(deg.)
10
(deg.)
(K＝2, within allowable ripple current)
0
10
………………(3)
ーT
-3
W/cm
)
× K
2
×℃)
ALUMINUM ELECTROLYTIC
)
ー Δ T
̶
10
Measuring point
)
………………(4)
CAPACITORS
2
)
TECHNICAL NOTE
Δ T
(3) The life equation considering the ambient temper-
ature and the ripple current will be a conversion of
the above equation (5), as below :
Since it is actually difficult to measure the temperature
increase at the capacitor core, the following table is
provided for conversion from the surface temperature
increase to the core temperature increase.
The life expectancy formula shall in principle be
applied to the temperature range between the ambient
temperature
temperature. The expected life time shall be about
fifteen years at maximum as a guide in terms of
deterioration of the sealant.
L ＝ Lr × 2
L ＝ Lr × 2
Where l
temperature (Arms)
I : Applied ripple current (Arms)
Where Lr : Life at the upper category temperature
Case diameter
Core / Surface
h (10
Year
3
h)
130
125
120
115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
0
0
8
1
: Rated ripple current at the upper category
: Temperature increase at capacitor core,
3
9
at the upper category temperature (deg.)
)
)
with the rated ripple current (h)
T
T
̶
̶
4
2
2
0
0
10
10
10
ーT
ーT
of
∼ 10
1.1
5
11
(Table 2-1 Life Expectancy Chart)
)
)
× K
＋40℃
12
5
× K
12.5 ∼ 16
6
1.2
Table 2-1
1
)
1
10
Δ T
̶
ー
0
10
)
CAT.No.2008/2009E ( 2008.10.1 )
ー Δ T
̶
7
1.25
and
I
20
18
I
0
3
)
2
)
1.3
×
22
………(5)
10
11
12
1
2
3
4
5
6
7
8
9
upper
50
5
̶
Δ T
10
1.4
105˚C: 1000hour guaranteed
105˚C: 2000hour guaranteed
105˚C: 3000hour guaranteed
105˚C: 5000hour guaranteed
105˚C: 20000hour guaranteed
125˚C: 1000hour guaranteed
125˚C: 1250hour guaranteed
125˚C: 2000hour guaranteed
125˚C: 3000hour guaranteed
125˚C: 5000hour guaranteed
25
10
0
85˚C: 1000hour guaranteed
85˚C: 2000hour guaranteed
100 131
……(6)
15
category
1.6
30
175
1.65
35