Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
SEK472M035ST Cornell Dubilier Electronics	CAP ALUM 4700UF 20% 35V RADIAL	0
106TTA035M Cornell Dubilier Electronics	CAP ALUM 10UF 20% 35V AXIAL	77
688TTA016M Cornell Dubilier Electronics	CAP ALUM 6800UF 20% 16V AXIAL	463100
CGS903U075X5C Cornell Dubilier Electronics	CAP ALUM 90000UF 75V SCREW	0
AVS107M10C12T-F Cornell Dubilier Electronics	CAP ALUM 100UF 20% 10V SMD	0
CGO892M028L Cornell Dubilier Electronics	CAP ALUM 8900UF 20% 28V SCREW	0
SLPX562M050A4P3 Cornell Dubilier Electronics	CAP ALUM 5600UF 20% 50V SNAP	0
381LX271M450K452 Cornell Dubilier Electronics	CAP ALUM 270UF 20% 450V SNAP	0
336TMA250M Cornell Dubilier Electronics	CAP ALUM 33UF 20% 250V AXIAL	0
CGS312T350V5L Cornell Dubilier Electronics	CAP ALUM 3100UF 350V SCREW	0
AVE227M10X16T-F Cornell Dubilier Electronics	CAP ALUM 220UF 20% 10V SMD	0
107TTA035M Cornell Dubilier Electronics	CAP ALUM 100UF 20% 35V AXIAL	0
WBR16-450A Cornell Dubilier Electronics	CAP ALUM 16UF 450V AXIAL	0
CGO632M028L Cornell Dubilier Electronics	CAP ALUM 6300UF 20% 28V SCREW	0
106CKS450MLU Cornell Dubilier Electronics	CAP ALUM 10UF 20% 450V THRU HOLE	166510500
SLPX102M160A9P3 Cornell Dubilier Electronics	CAP ALUM 1000UF 20% 160V SNAP	0
MLP171M450EA1A Cornell Dubilier Electronics	CAP ALUM 170UF 20% 450V FLATPACK	0
337LMX250M2CD Cornell Dubilier Electronics	CAP ALUM 330UF 20% 250V SNAP	0
477KXM025M Cornell Dubilier Electronics	CAP ALUM 470UF 20% 25V THRU HOLE	0
381LX823M025A102 Cornell Dubilier Electronics	CAP ALUM 82000UF 20% 25V SNAP	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.