DC-2R5E224U-E Elna America, DC-2R5E224U-E Datasheet - Page 116

• Manufacturer Part Number: DC-2R5E224U-E
• Description: CAP DOUBLE LAYER .22F 2.5V COIN
• Manufacturer: Elna America
• Series: DCr

Specifications of DC-2R5E224U-E

• Capacitance: 220mF
• 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
• Lead Spacing: 0.079" (2.00mm)
• Height: 0.295" (7.50mm)
• Size / Dimension: 0.268" Dia (6.80mm)
• Operating Temperature: -25°C ~ 70°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 604-1006

5 Electrode Foil Development Technology
5-1 Corrosion inhibition of cathode foil
Inactive treatment is implemented to ensure long life by
inhibiting natural corrosion of the cathode foil. Fig. 3-1
shows its effects with values of the polarization
resistance inversely proportional to the corrosion rate
using the AC impedance method (FRA). This indicates
that the cathode foil used in the High reliability capacitors
has the polarization resistance higher than that of the
conventional capacitors owing to corrosion inhibition.
5-2 Sealing material permeability of electrolyte
To ensure long life, a low permeable lactone solvent for
the sealing material is used as the main solvent of the
electrolyte of the High reliability capacitor. Fig. 3-2 shows
the test results on the permeability obtained by chang-
ing the weight of the capacitors produced with different
types of electrolytes at a high temperature.
5-3 Airtightness of sealing material
Since the electrolyte is stable for hours, the key element
for capacitor’s life is the sealing material. By optimizing
the crosslinking density of the sealing material polymer,
the sealing material of the High reliability capacitor attains
its long life with electrolyte permeability less than that of
the conventional capacitors.
Fig. 3-3 shows the test results on the airtightness of
the sealing material obtained by changing the weight
of the capacitors at a high temperature, producing
capacitors with the conventional sealing material and
improved one both containing the electrolyte used in
the High reliability capacitor.
NOTE
Design, Specifications are subject to change without notice.
Ask factory for technical specifications before purchase and/or use.
100
10
1
0
(Ω)
10
10
10
10
®
5
4
3
2
High reliability capacitors
Fig. 3-2
Time (h)
Fig. 3-1
1000
.
ALUMINUM ELECTROLYTIC
Reference
2000
CAPACITORS
; High reliability capacitors
; Amidic solvent
; Lactonic product
TECHNICAL NOTE
5-4 Long-time stability of electrolyte
The electrolyte used in the High reliability capacitor is sta-
ble with low initial resistivity and small secular
changes at a high temperature. Fig. 3-4 shows
change in resistivity at 105°C.
5-5 Dielectric formation voltage and leakage current
To increase the operating life by controlling the gas
generation inside capacitor because of 1.5 to 2 times
the rated voltage, while that of the previous capacitor
is about 1.3 times the rated voltage.
5-6 Lowered ESR of Electrode Foil
To reduce the ESR of electrolytic capacitor, we have
improved our chemical conversion technology for
anode foil to develop lower ESR electrode foil compared
to the conventional product as shown in Fig. 3-6
characteristics of anode foil
0.5
200
100
10
100
100
0.1
10
0
10
1
1
0
0
Fig. 3-6 ESR Index of Anode Foil
20
1
50
Fig. 3-3
Time (h)
Fig. 3-4
Time (h)
1000
1000
.
Voltage ratio
Fig. 3-5
1.5
80
CAT.No.2008/2009E ( 2008.10.1 )
105
2
2000
2000
; Reference
; High reliability capacitors
; Reference
; Reference
; High reliability capacitors
; High reliability capacitors
2.5