Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
380LX183M063A082 Cornell Dubilier Electronics	CAP ALUM 18000UF 20% 63V SNAP	1453
382LX473M050B062VS Cornell Dubilier Electronics	CAP ALUM 47000UF 20% 50V SNAP	42
158KXM025M Cornell Dubilier Electronics	CAP ALUM 1500UF 20% 25V T/H	0
SEK330M050ST Cornell Dubilier Electronics	CAP ALUM 33UF 20% 50V RADIAL	0
THAS251M250AD0C Cornell Dubilier Electronics	CAP ALUM 250UF 20% 250V T/H	0
CGS451T450V3C Cornell Dubilier Electronics	CAP ALUM 450UF 450V SCREW	0
381LX821M315A052 Cornell Dubilier Electronics	CAP ALUM 820UF 20% 315V SNAP	0
475RSS035M Cornell Dubilier Electronics	CAP ALUM 4.7UF 20% 35V THRU HOLE	0
381LX821M400A062 Cornell Dubilier Electronics	CAP ALUM 820UF 20% 400V SNAP	174
381LX471M315K052 Cornell Dubilier Electronics	CAP ALUM 470UF 20% 315V SNAP	0
WBR30-250A Cornell Dubilier Electronics	CAP ALUM 30UF 250V AXIAL	0
THAS191M250AC1C Cornell Dubilier Electronics	THINPACK CAP ALUM 190 250V	0
SLP333M010C4P3 Cornell Dubilier Electronics	CAP ALUM 33000UF 20% 10V SNAP	0
THA801M100AB1C Cornell Dubilier Electronics	THINPACK CAP ALUM 800 100V	0
CGS103T250X5L Cornell Dubilier Electronics	CAP ALUM 10000UF 250V SCREW	1227
MLP601M200EA0A Cornell Dubilier Electronics	CAP ALUM 600UF 20% 200V FLATPACK	0
AHA336M50E16T-F Cornell Dubilier Electronics	CAP ALUM 33UF 20% 50V SMD	0
MLS682M020EK1D Cornell Dubilier Electronics	CAP ALUM 6800UF 20% 20V FLATPACK	0
MLS263M7R5EA0C Cornell Dubilier Electronics	CAP ALUM 26000UF 20% 7.5V FLTPCK	0
CGS212U150R3C Cornell Dubilier Electronics	CAP ALUM 2100UF 150V SCREW	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.