Nichicon Aluminum Electrolytic Capacitors

Results: 23,824
Series
-*F11F18GQLAKLAQLARLASLDMLDQLGC
Packaging
BulkCut Tape (CT)Digi-Reel®StripTape & Box (TB)Tape & Reel (TR)Tray
Product Status
ActiveDiscontinued at Digi-KeyLast Time BuyNot For New DesignsObsolete
Capacitance
0.1 µF0.15 µF0.22 µF0.33 µF0.47 µF0.68 µF1 µF1.2 µF1.5 µF1.8 µF2.2 µF2.7 µF
Tolerance
-10%, +50%±10%±20%
Voltage - Rated
2.5 V4 V5.5 V6.3 V10 V16 V25 V35 V42 V50 V56 V63 V
ESR (Equivalent Series Resistance)
5mOhm @ 100kHz18mOhm @ 100kHz19mOhm @ 100kHz20mOhm @ 100kHz21mOhm @ 100kHz22mOhm @ 100kHz23mOhm @ 100kHz24mOhm @ 100kHz25mOhm @ 100kHz26mOhm @ 100kHz27mOhm @ 100kHz28mOhm @ 100kHz
Lifetime @ Temp.
1000 Hrs @ 105°C1000 Hrs @ 125°C1000 Hrs @ 135°C1000 Hrs @ 150°C1000 Hrs @ 85°C1500 Hrs @ 150°C2000 Hrs @ 105°C2000 Hrs @ 125°C2000 Hrs @ 135°C2000 Hrs @ 150°C2000 Hrs @ 85°C3000 Hrs @ 105°C
Operating Temperature
-55°C ~ 105°C-55°C ~ 125°C-55°C ~ 135°C-55°C ~ 150°C-40°C ~ 105°C-40°C ~ 125°C-40°C ~ 135°C-40°C ~ 150°C-40°C ~ 85°C-25°C ~ 105°C-25°C ~ 125°C-25°C ~ 150°C-25°C ~ 85°C
Polarization
-Bi-PolarPolar
Ratings
-AEC-Q200
Applications
AudioAutomotiveAutomotive, High Temperature ReflowGeneral PurposeHigh Temperature Reflow
Ripple Current @ Low Frequency
0.9 mA @ 120 Hz1 mA @ 120 Hz1.1 mA @ 120 Hz1.2 mA @ 120 Hz1.3 mA @ 120 Hz1.5 mA @ 120 Hz1.53 mA @ 120 Hz1.6 mA @ 120 Hz1.883 mA @ 120 Hz1.9 mA @ 120 Hz2 mA @ 120 Hz2.1 mA @ 120 Hz
Ripple Current @ High Frequency
1.35 mA @ 10 kHz1.5 mA @ 10 kHz2.2 mA @ 10 kHz2.4 mA @ 10 kHz2.6 mA @ 10 kHz3 mA @ 10 kHz3.2 mA @ 10 kHz3.3 mA @ 10 kHz3.3 mA @ 100 kHz3.36 mA @ 10 kHz3.45 mA @ 10 kHz3.8 mA @ 10 kHz
Impedance
6.5 mOhms7 mOhms8 mOhms9 mOhms10 mOhms11 mOhms12 mOhms13 mOhms14 mOhms15 mOhms16 mOhms17 mOhms
Lead Spacing
0.039" (1.00mm)0.059" (1.50mm)0.079" (2.00mm)0.098" (2.50mm)0.138" (3.50mm)0.197" (5.00mm)0.295" (7.50mm)0.335" (8.50mm)0.394" (10.00mm)0.492" (12.50mm)0.500" (12.70mm)0.551" (14.00mm)0.709" (18.00mm)0.866" (22.00mm)
Size / Dimension
0.118" Dia (3.00mm)0.157" Dia (4.00mm)0.197" Dia (5.00mm)0.197" Dia x 0.472" L (5.00mm x 12.00mm)0.197" Dia x 0.512" L (5.00mm x 13.00mm)0.236" L x 0.126" W (6.00mm x 3.20mm)0.248" Dia (6.30mm)0.248" Dia x 0.472" L (6.30mm x 12.00mm)0.248" Dia x 0.512" L (6.30mm x 13.00mm)0.248" Dia x 0.630" L (6.30mm x 16.00mm)0.248" Dia x 0.669" L (6.30mm x 17.00mm)0.315" Dia (8.00mm)
Height - Seated (Max)
0.075" (1.90mm)0.079" (2.00mm)0.098" (2.50mm)0.126" (3.20mm)0.156" (3.95mm)0.181" (4.60mm)0.197" (5.00mm)0.205" (5.20mm)0.213" (5.40mm)0.217" (5.50mm)0.224" (5.70mm)0.228" (5.80mm)
Surface Mount Land Size
0.130" L x 0.130" W (3.30mm x 3.30mm)0.169" L x 0.169" W (4.30mm x 4.30mm)0.209" L x 0.209" W (5.30mm x 5.30mm)0.256" L x 0.126" W (6.50mm x 3.20mm)0.260" L x 0.260" W (6.60mm x 6.60mm)0.327" L x 0.327" W (8.30mm x 8.30mm)0.335" L x 0.209" W (8.50mm x 5.30mm)0.406" L x 0.406" W (10.30mm x 10.30mm)0.535" L x 0.535" W (13.60mm x 13.60mm)0.654" L x 0.654" W (16.60mm x 16.60mm)0.657" L x 0.476" W (16.70mm x 12.10mm)0.673" L x 0.673" W (17.10mm x 17.10mm)0.748" L x 0.748" W (19.00mm x 19.00mm)0.752" L x 0.752" W (19.10mm x 19.10mm)
Mounting Type
Chassis MountSurface MountThrough Hole
Package / Case
Axial, CanNonstandard SMDRadial, Can - SMDRadial, Can - Screw TerminalsRadial, Can - Snap-InRadial, Can - Solder LugRadial, Can
Stocking Options
Environmental Options
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Marketplace Product
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Mfr Part #
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Price
Series
Package
Product Status
Capacitance
Tolerance
Voltage - Rated
ESR (Equivalent Series Resistance)
Lifetime @ Temp.
Operating Temperature
Polarization
Ratings
Applications
Ripple Current @ Low Frequency
Ripple Current @ High Frequency
Impedance
Lead Spacing
Size / Dimension
Height - Seated (Max)
Surface Mount Land Size
Mounting Type
Package / Case
WT,WX Series
UWT1C100MCL1GB
CAP ALUM 10UF 20% 16V SMD
Nichicon
178,412
In Stock
1 : $0.50000
Cut Tape (CT)
2,000 : $0.12288
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
10 µF
±20%
16 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
18 mA @ 120 Hz
27 mA @ 10 kHz
-
-
0.157" Dia (4.00mm)
0.213" (5.40mm)
0.169" L x 0.169" W (4.30mm x 4.30mm)
Surface Mount
Radial, Can - SMD
WT,UD Series
UUD1C101MCL1GS
CAP ALUM 100UF 20% 16V SMD
Nichicon
347,300
In Stock
1 : $0.53000
Cut Tape (CT)
1,000 : $0.12569
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
16 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
115 mA @ 120 Hz
230 mA @ 100 kHz
440 mOhms
-
0.248" Dia (6.30mm)
0.240" (6.10mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1V101MCL1GS
CAP ALUM 100UF 20% 35V SMD
Nichicon
105,207
In Stock
1 : $0.53000
Cut Tape (CT)
900 : $0.13167
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
35 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
84 mA @ 120 Hz
126 mA @ 10 kHz
-
-
0.248" Dia (6.30mm)
0.303" (7.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
UVY Series 8mm
UVY1J101MPD1TD
CAP ALUM 100UF 20% 63V RADIAL
Nichicon
0
In Stock
1 : $0.80000
Cut Tape (CT)
1,000 : $0.23540
Tape & Box (TB)
Cut Tape (CT)
Tape & Box (TB)
Not For New Designs
100 µF
±20%
63 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
-
General Purpose
200 mA @ 120 Hz
300 mA @ 10 kHz
-
0.138" (3.50mm)
0.315" Dia (8.00mm)
0.512" (13.00mm)
-
Through Hole
Radial, Can
WT_UD Series
UUD1C221MCL1GS
CAP ALUM 220UF 20% 16V SMD
Nichicon
1,614
In Stock
1 : $0.66000
Cut Tape (CT)
900 : $0.18311
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
220 µF
±20%
16 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
140 mA @ 120 Hz
280 mA @ 100 kHz
340 mOhms
-
0.248" Dia (6.30mm)
0.315" (8.00mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1H101MNL1GS
CAP ALUM 100UF 20% 50V SMD
Nichicon
101,951
In Stock
1 : $0.72000
Cut Tape (CT)
500 : $0.24784
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
50 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
140 mA @ 120 Hz
210 mA @ 10 kHz
-
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1E101MCL1GS
CAP ALUM 100UF 20% 25V SMD
Nichicon
27,452
In Stock
1 : $0.72000
Cut Tape (CT)
900 : $0.20123
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
25 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
91 mA @ 120 Hz
136.5 mA @ 10 kHz
-
-
0.248" Dia (6.30mm)
0.303" (7.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
WT,UD Series
UUD1V470MCL1GS
CAP ALUM 47UF 20% 35V SMD
Nichicon
9,353
In Stock
1 : $0.72000
Cut Tape (CT)
1,000 : $0.21037
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
47 µF
±20%
35 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
115 mA @ 120 Hz
230 mA @ 100 kHz
440 mOhms
-
0.248" Dia (6.30mm)
0.240" (6.10mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
CW SERIES 7MM
UCW1C101MCL1GS
CAP ALUM 100UF 20% 16V SMD
Nichicon
11,228
In Stock
1 : $0.82000
Cut Tape (CT)
1,000 : $0.24035
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
16 V
-
7000 Hrs @ 105°C
-25°C ~ 105°C
Polar
AEC-Q200
General Purpose
70 mA @ 120 Hz
140 mA @ 100 kHz
1.1 Ohms
-
0.248" Dia (6.30mm)
0.276" (7.00mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1V221MNL1GS
CAP ALUM 220UF 20% 35V SMD
Nichicon
366,332
In Stock
1 : $0.86000
Cut Tape (CT)
500 : $0.29892
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Active
220 µF
±20%
35 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
190 mA @ 120 Hz
285 mA @ 10 kHz
-
-
0.315" Dia (8.00mm)
0.394" (10.00mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1E331MNL1GS
CAP ALUM 330UF 20% 25V SMD
Nichicon
22,103
In Stock
1 : $0.86000
Cut Tape (CT)
500 : $0.29892
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
330 µF
±20%
25 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
190 mA @ 120 Hz
285 mA @ 10 kHz
-
-
0.315" Dia (8.00mm)
0.394" (10.00mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UWT1C471MNL1GS
CAP ALUM 470UF 20% 16V SMD
Nichicon
40,867
In Stock
1 : $0.88000
Cut Tape (CT)
500 : $0.30412
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
470 µF
±20%
16 V
-
1000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
230 mA @ 120 Hz
345 mA @ 10 kHz
-
-
0.315" Dia (8.00mm)
0.394" (10.00mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
UCM & UX Series 10mm
UUX1J101MNL1GS
CAP ALUM 100UF 20% 63V SMD
Nichicon
5,073
In Stock
1 : $0.90000
Cut Tape (CT)
500 : $0.30670
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
63 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
320 mA @ 120 Hz
416 mA @ 10 kHz
-
-
0.394" Dia (10.00mm)
0.413" (10.50mm)
0.406" L x 0.406" W (10.30mm x 10.30mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UUD1H101MNL1GS
CAP ALUM 100UF 20% 50V SMD
Nichicon
58,882
In Stock
1 : $0.93000
Cut Tape (CT)
500 : $0.32288
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
50 V
-
5000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
150 mA @ 120 Hz
300 mA @ 100 kHz
340 mOhms
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
CD Series 10.50mm
UCD2A220MNL1GS
CAP ALUM 22UF 20% 100V SMD
Nichicon
15,545
In Stock
1 : $0.94000
Cut Tape (CT)
500 : $0.32416
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
22 µF
±20%
100 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
65 mA @ 120 Hz
130 mA @ 100 kHz
1.3 Ohms
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
CW SERIES 8.7MM
UCW1E101MCL1GS
CAP ALUM 100UF 20% 25V SMD
Nichicon
42,205
In Stock
1 : $0.96000
Cut Tape (CT)
800 : $0.29584
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
25 V
-
7000 Hrs @ 105°C
-25°C ~ 105°C
Polar
AEC-Q200
General Purpose
115 mA @ 120 Hz
230 mA @ 100 kHz
1 Ohms
-
0.248" Dia (6.30mm)
0.343" (8.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
CW SERIES 8.7MM
UCW1C221MCL1GS
CAP ALUM 220UF 20% 16V SMD
Nichicon
24,707
In Stock
1 : $0.96000
Cut Tape (CT)
800 : $0.29990
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
220 µF
±20%
16 V
-
7000 Hrs @ 105°C
-25°C ~ 105°C
Polar
AEC-Q200
General Purpose
115 mA @ 120 Hz
230 mA @ 100 kHz
1 Ohms
-
0.248" Dia (6.30mm)
0.343" (8.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
CD Series 10.50mm
UCD1V101MNL1GS
CAP ALUM 100UF 20% 35V SMD
Nichicon
22,990
In Stock
1 : $0.96000
Cut Tape (CT)
500 : $0.32872
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
35 V
-
5000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
300 mA @ 120 Hz
600 mA @ 100 kHz
160 mOhms
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
CL Series 6.3mm
UCL1C221MCL1GS
CAP ALUM 220UF 20% 16V SMD
Nichicon
27,361
In Stock
1 : $0.99000
Cut Tape (CT)
900 : $0.31039
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
220 µF
±20%
16 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
300 mA @ 120 Hz
600 mA @ 100 kHz
160 mOhms
-
0.248" Dia (6.30mm)
0.303" (7.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UUD1V101MNL1GS
CAP ALUM 100UF 20% 35V SMD
Nichicon
11,500
In Stock
1 : $0.99000
Cut Tape (CT)
500 : $0.34294
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
35 V
-
5000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
225 mA @ 120 Hz
450 mA @ 100 kHz
170 mOhms
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
CL Series 6.3mm
UCL1E101MCL1GS
CAP ALUM 100UF 20% 25V SMD
Nichicon
9,086
In Stock
1 : $0.99000
Cut Tape (CT)
900 : $0.31039
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
25 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
General Purpose
300 mA @ 120 Hz
600 mA @ 100 kHz
160 mOhms
-
0.248" Dia (6.30mm)
0.303" (7.70mm)
0.260" L x 0.260" W (6.60mm x 6.60mm)
Surface Mount
Radial, Can - SMD
CD Series 10mm
UCD2A330MNL1GS
CAP ALUM 33UF 20% 100V SMD
Nichicon
20,900
In Stock
1 : $1.03000
Cut Tape (CT)
500 : $0.41122
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
33 µF
±20%
100 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
100 mA @ 120 Hz
200 mA @ 100 kHz
700 mOhms
-
0.394" Dia (10.00mm)
0.413" (10.50mm)
0.406" L x 0.406" W (10.30mm x 10.30mm)
Surface Mount
Radial, Can - SMD
CD Series 10.50mm
UCD1H101MNL1GS
CAP ALUM 100UF 20% 50V SMD
Nichicon
17,603
In Stock
1 : $1.03000
Cut Tape (CT)
500 : $0.41184
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
100 µF
±20%
50 V
-
5000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
175 mA @ 120 Hz
350 mA @ 100 kHz
320 mOhms
-
0.315" Dia (8.00mm)
0.413" (10.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
CD Series 6.50mm
UCD1C221MCL6GS
CAP ALUM 220UF 20% 16V SMD
Nichicon
40,017
In Stock
1 : $1.04000
Cut Tape (CT)
1,000 : $0.30634
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
220 µF
±20%
16 V
-
2000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
150 mA @ 120 Hz
300 mA @ 100 kHz
260 mOhms
-
0.315" Dia (8.00mm)
0.256" (6.50mm)
0.327" L x 0.327" W (8.30mm x 8.30mm)
Surface Mount
Radial, Can - SMD
WT_UD Series
UUD1E471MNL1GS
CAP ALUM 470UF 20% 25V SMD
Nichicon
5,289
In Stock
1 : $1.04000
Cut Tape (CT)
500 : $0.41370
Tape & Reel (TR)
Tape & Reel (TR)
Cut Tape (CT)
Digi-Reel®
Active
470 µF
±20%
25 V
-
5000 Hrs @ 105°C
-55°C ~ 105°C
Polar
AEC-Q200
Automotive
335 mA @ 120 Hz
670 mA @ 100 kHz
90 mOhms
-
0.394" Dia (10.00mm)
0.413" (10.50mm)
0.406" L x 0.406" W (10.30mm x 10.30mm)
Surface Mount
Radial, Can - SMD
Showing
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Aluminum Electrolytic Capacitors


An electrolytic capacitor is a type of polarized capacitor that uses a wet electrolytic solution and an oxide film to store electrical charge. An example is the aluminum electrolytic capacitor which contains two closely spaced spooled strips of aluminum foil for the positive anode and negative cathode. These are separated by a thin spacer material soaked in the wet electrolyte. The thin insulating layer of aluminum oxide formed on the anode between the foil plates acts as the dielectric, creating a high-capacitance device in a compact package. These polarized capacitors are well-suited for applications where space and weight are at a premium, such as in electronic devices, power supplies, and filtering circuits.