Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
337KXM050M Cornell Dubilier Electronics	CAP ALUM 330UF 20% 50V THRU HOLE	0
381LQ122M250K452 Cornell Dubilier Electronics	CAP ALUM 1200UF 20% 250V SNAP	1
SK220M063ST Cornell Dubilier Electronics	CAP ALUM 22UF 20% 63V RADIAL	0
WBR150-150A Cornell Dubilier Electronics	CAP ALUM 150UF 150V AXIAL	0
478LBB035M2BD Cornell Dubilier Electronics	CAP ALUM 4700UF 20% 35V SNAP	0
PSU24315B Cornell Dubilier Electronics	CAP ALUM 243UF 125V QC TERM	0
336CKE100M Cornell Dubilier Electronics	CAP ALUM 33UF 20% 100V RADIAL	0
381LQ181M315H022 Cornell Dubilier Electronics	CAP ALUM 180UF 20% 315V SNAP	0
108LMX200M2EE Cornell Dubilier Electronics	CAP ALUM 1000UF 20% 200V SNAP	0
CG333U035X4C Cornell Dubilier Electronics	CAP ALUM 33000UF 35V SCREW	0
SLPX102M180C7P3 Cornell Dubilier Electronics	CAP ALUM 1000UF 20% 180V SNAP	0
188LBB200M2EG Cornell Dubilier Electronics	CAP ALUM 1800UF 20% 200V SNAP	0
381LX271M400J052 Cornell Dubilier Electronics	CAP ALUM 270UF 20% 400V SNAP	2147
381LQ681M180J022 Cornell Dubilier Electronics	CAP ALUM 680UF 20% 180V SNAP	0
ATB476M6R3 Cornell Dubilier Electronics	CAP ALUM 47UF 20% 6.3V SMD	0
335CKS400MJM Cornell Dubilier Electronics	CAP ALUM 3.3UF 20% 400V T/H	0
THA132M060AA1C Cornell Dubilier Electronics	THINPACK CAP ALUM 1300 60V	0
687RZM035M1320 Cornell Dubilier Electronics	CAP ALUM 680UF 20% 35V THRU HOLE	1009400
SLP681M220H3P3 Cornell Dubilier Electronics	CAP ALUM 680UF 20% 220V SNAP	0
CG252U075V3C Cornell Dubilier Electronics	CAP ALUM 2500UF 75V 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.