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ELECTROLYTIC ALUMINUM CAPACITORS
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ELECTROLYTIC ALUMINUM CAPACITORS
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Revision 01/19
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1. BASIC CONSTRUCTION
Structure of an electrolytic aluminum capacitor is shown hereunder:
1. Anode: aluminum foil
2. Dielectric: aluminum oxide
3. Papers spacers impregnated with electrolyte
4. Ionic conduction assumed by electrolyte
5. Cathode: aluminum foil
The positive plate is an etched aluminum foil covered with alumina
which is the dielectric of the capacitor.
The negative plate is constituted by a second aluminum foil which
serves as a current supply, and by electrolyte-impregnated papers
layers.
The metal used for anode is a ≥ 99,98 % grade aluminum.
The dielectric has a thickness of 13 Å / V.
The aluminum used for the cathode is a ≥ 98 % grade aluminum
covered with a dielectric layer with a thickness of about 40 Å.
2. DIAGRAM OF THE EQUIVALENT CIRCUIT
CA = Capacitance of the anode
CK = Capacitance of the cathode
Rp = Parallel resistance due to the aluminum oxide f Ilms.
RL = Series resistance of connections, plates and impregnated
spacer.
Ls = Inductance of winding and connections.
A standard simplifi ed diagram is.
Cs is the series capacitance of both anode and cathode capacitances.
Electrolytic aluminum capacitors are naturally polarized because
of the insulating f Ilm on the anode. Given the very thin aluminum
oxide layer, a reversed voltage should not exceed 1.5 V when there is
energy supply.
Short duration reverse voltages can be absorbed by special
construction, second anode replacing the former cathode.
3. CAPACITORS MARKING
3.1. ARTICLE CODE (ON EACH PACKAGING)
A followed by 6 fi gures number. First 3 positions are specifi c of the range.
(Ex. A 745xxx for a FELSIC 85 BD)
In FELSIC ranges, article code without fi rst letter A, is printed on each
capacitor.
a Figure 9 in fourth position shows a special product.
3.2. BATCH (ON EACH CAPACITOR).
3 fi gures or 6 fi gures
3.3. DATE (ON EACH CAPACITOR IF APPLICABLE)
4 fi gures (year-week)
4. ELECTRICAL CHARACTERISTICS
4.1. RATED CAPACITANCE C
R
The rated capacitance is defi ned at 100 Hz and at ambient
temperature.
4.2. RATED VOLTAGE U
R
U
R
is the maximum DC voltage which may be applied in continuous
operation.
When applying a superimposed alternating voltage, the peak value of
the resulting waveform should not exceed the rated voltage.
4.3. PEAK VOLTAGE U
P
Up is the maximum repetitive voltage which can be applied within
short periods.
Defi ned in CECC 30 300 and IEC 60 384-4:
1000 cycles of 30 s charge followed by a no load period of 5 min. 30 s
with upper category temperature.
Up ≤ 1,15 U
R
(U
R
≤ 315 V)
Up ≤ 1,10 U
R
(U
R
> 315 V)
General technical data
140 FELSIC in bank
701 PRORELSIC 125
703 PRORELSIC 125
704 SNAPSIC
705 SNAPSIC 105
706 FELSIC HP BC – BD
708 PRORELSIC 145
710 CUBISIC
711 PROMISIC 031
712 CUBISIC LP
713 SNAPSIC 105 LP
714 SNAPSIC 4P
715 SNAPSIC 105 4P
716 SNAPSIC HV
717 SNAPSIC HC
718 SNAPSIC 125
721 RELSIC 033
722 CI FRS
723 CI FRS
728 FELSIC 039 (ex 727)
FELSIC DI
738 FELSIC 037 (ex 737)
740 FELSIC 125 FRS BC
(ex 731)
741 FELSIC 125 FRS BD
(ex 731)
742 PRORELSIC 105 TFRS
743 PRORELSIC 105 TFRS
744 FELSIC 85 BC
FELSIC 85 LP
745 FELSIC 85 BD
746 FELSIC 85 M BC
747 FELSIC 85 M BD
748 SICAL CO 42 - SICAL
749 SICAL CO 42 - SICAL
750 CUBISIC 125
756 FELSIC 105 BC
FELSIC 105 LP
757 FELSIC 105 BD
760 FELSIC HC BC
761 FELSIC HC BD
762 FELSIC 105 TFRS BC
763 FELSIC 105 TFRS BD
764 FELSIC HV BC
765 FELSIC HV BD
775 VACSIC
774 VACSIC 150
776 ALSIC 20G
ALSIC 145 20G
7
ELECTROLYTIC ALUMINUM CAPACITORS
GENERAL TECHNICAL DATA
Revision 01/19
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ELECTROLYTIC ALUMINUM CAPACITORS
7
Revision 01/19
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4.4. DISSIPATION FACTOR TAN
The dissipation or loss factor is defi ned by its tangent Tan
4.5. EQUIVALENT SERIES RESISTANCE ESR
The relation between ESR and dissipation factor Tan is given in § 4.4.
4.6. IMPEDANCE Z - INDUCTANCE L
The impedance is given by:
Z =
g
R
2
+ (L
–1
)
2
C
L inductance. Generally L = 5 to 20 nH
Z and ESR as function of frequency typically follows the chart:
4.7. PERMISSIBLE RIPPLE CURRENT (I r.m.s.) I~
The current is defi ned at the maximum climatic category and at 100
Hz. It is the root mean square value r.m.s. The value I
0
is the rated
value for calculations of expected life up to3 I
0
.
4.8. LEAKAGE CURRENT Il
Il is measured at 20°C after a 5 min. polarization under rated voltage.
For C
R
in µF and U
R
in V:
Il ≤ 0,01 C
R
U
R
or 1 µA*
when C
R
U
R
≤ 1000 µC
Il ≤ 0,006 C
R
U
R
+ 4 µA
when C
R
U
R
> 1000 µC
For U
R
> 350 V
DC
it can be specifi ed:
with K = 4, 6 or 8
or
Il ≤ 0,3 (C
R
U
R
)
0,7
+ 4 µA (CECC 30 300)
* Whichever is the greater
4.9. CHARACTERISTICS
Versus temperature (typical values).
4.9.1. Capacitance drift
Versus temperature
4.9.2. ESR and Z drifts at 100 Hz
Versus temperature
4.9.3 Leakage current drift
Versus temperature
General technical data