Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
ULM.10M50 NTE Electronics, Inc.	CAP ALUM 0.1UF 20% 50V RADIAL	3839
ALS71C363QW200 KEMET	CAP ALUM 36000UF 20% 200V SCREW	0
400MXK560MEFCSN35X30 Rubycon	CAP ALUM 560UF 20% 400V SNAP	0
ELXY250ELL221MH15D United Chemi-Con	CAP ALUM 220UF 20% 25V RADIAL	1346
100ZLJ820M18X40 Rubycon	CAP ALUM 820UF 20% 100V RADIAL	0
476SML035MD8 Cornell Dubilier Electronics	CAP ALUM 47UF 20% 35V SMD	0
80ZLJ680MGC18X25 Rubycon	CAP ALUM 680UF 20% 80V RADIAL	114
ECA-2GM3R3B Panasonic	CAP ALUM 3.3UF 20% 400V RADIAL	0
UKL1C471MPD1TD Nichicon	CAP ALUM 470UF 20% 16V RADIAL	731
B43866F2156M TDK EPCOS	CAP ALUM 15UF 20% 250V RADIAL	0
UCS2D100MPD Nichicon	CAP ALUM 10UF 20% 200V RADIAL	432
LGU2D821MELB Nichicon	CAP ALUM 820UF 20% 200V SNAP	9
ELXV250ELL221MH15D United Chemi-Con	CAP ALUM 220UF 20% 25V RADIAL	0
B43252C9127M TDK EPCOS	CAP ALUM 120UF 20% 400V SNAP	0
B43252G2277M TDK EPCOS	CAP ALUM 270UF 20% 250V SNAP	0
AHA476M50F24T-F Cornell Dubilier Electronics	CAP ALUM 47UF 20% 50V SMD	0
381LQ681M400A452 Cornell Dubilier Electronics	CAP ALUM 680UF 20% 400V SNAP	586
UPW2G470MRD6 Nichicon	CAP ALUM 47UF 20% 400V RADIAL	63
EEE-FT1V331AP Panasonic	CAP ALUM 330UF 20% 35V SMD	0
UBT2D220MPD Nichicon	CAP ALUM 22UF 20% 200V RADIAL	0

Aluminum Electrolytic Capacitors

1. Overview

Aluminum electrolytic capacitors are polarized capacitors using an aluminum oxide layer as the dielectric medium. They consist of an aluminum anode, electrolyte solution, and cathode. These capacitors offer high capacitance values (1 F-2.7F) with relatively compact size, making them essential components in power supply filtering, signal decoupling, and energy storage applications. Their evolution has enabled miniaturization in electronics while maintaining performance in harsh environments.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Radial Lead Type	Vertical mounting with dual leads	Consumer electronics power supplies
SMD Type	Surface-mount design for PCB integration	Computer motherboards
Stud Mount Type	High-current screw terminal design	Industrial inverters
Bi-polar Type	Able to withstand reverse voltage	Motor drive circuits

3. Structure and Composition

Typical construction includes: - Anode Foil: High-purity aluminum with etched surface (100-600m /m effective area) - Dielectric Layer: 0.1-0.8 m thick aluminum oxide (Al O ) - Electrolyte: Ammonium borate solution in organic solvent - Cathode Foil: 50-100 m aluminum sheet - Separator Paper: 50 m thick kraft paper soaked in electrolyte - Aluminum Case: 0.5-2.0mm thick stamped enclosure

4. Key Technical Specifications

Parameter	Description	Importance
Capacitance (C)	1 F-2.7F (120Hz measurement)	Determines filtering effectiveness
Rated Voltage (UR)	6.3V-630V DC working range	Failure risk above limit
ESR	5m -1.5 at 100kHz	Affects switching performance
Ripple Current	100mA-5A RMS	Lifetime predictor
Leakage Current	0.01C UR A maximum	Power efficiency factor
Operating Temp	-55 C to +150 C range	Reliability indicator

5. Application Fields

Power Electronics: Switching power supplies, UPS systems
Consumer Devices: TVs, gaming consoles, LED lighting
Industrial: Variable frequency drives, welding machines
Automotive: On-board chargers, ADAS systems
Renewables: Solar inverters, wind turbine converters

6. Leading Manufacturers

Manufacturer	Headquarters	Representative Product
Nichicon	Japan	UPW Series (105 C, 2000h)
Rubycon	Japan	ZL Series (Low ESR 4m )
United Chemi-Con	USA	KXJ Series (630V rating)
Samxon	Taiwan	EEU-FR Series (Conductive polymer hybrid)

7. Selection Guidelines

Consider these factors: - Required capacitance tolerance ( 20% standard) - Voltage derating (select 1.25 operating voltage) - Temperature range (automotive requires -40 C to +150 C) - Vibration resistance (screw-terminal better than SMD) - Lifetime calculation: Lx = L0 (T0/ T) (UR/UX) - RoHS compliance for environmental regulations

Industry Trends

Current developments include: - Conductive polymer hybrid capacitors (30% ESR reduction) - Nanoscale dielectric engineering (<0.1 m oxide layers) - AI-driven lifetime prediction models - Bio-compatible electrolyte formulations - 4D printing of anode structures - Integration with PCB substrates

Application Case

In a 3kW server power supply, 4x 450V/470 F capacitors in parallel provide 2220 F total capacitance with 14Arms ripple current handling. The design uses Nichicon U3 series devices with 6.5mm lead spacing, operating at 120 C with 95% voltage derating, achieving 8000-hour MTBF.