Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
381LX682M016H012 Cornell Dubilier Electronics	CAP ALUM 6800UF 20% 16V SNAP	842
381LX472M080A042 Cornell Dubilier Electronics	CAP ALUM 4700UF 20% 80V SNAP	364
AVES475M50C12T-F Cornell Dubilier Electronics	CAP ALUM 4.7UF 20% 50V SMD	0
MLP222M063EK0C Cornell Dubilier Electronics	CAP ALUM 2200UF 20% 63V FLATPACK	0
381LX101M350H022 Cornell Dubilier Electronics	CAP ALUM 100UF 20% 350V SNAP	0
WBR5-150A Cornell Dubilier Electronics	CAP ALUM 5UF 150V AXIAL	0
381LQ152M160A022 Cornell Dubilier Electronics	CAP ALUM 1500UF 20% 160V SNAP	0
381LR221M450J042 Cornell Dubilier Electronics	CAP ALUM 220UF 20% 450V SNAP	0
381LR391M420K052 Cornell Dubilier Electronics	CAP ALUM 390UF 20% 420V SNAP	0
382LX332M200N062 Cornell Dubilier Electronics	CAP ALUM 3300UF 20% 200V SNAP	802
HVMLS283M5R0EA1D Cornell Dubilier Electronics	CAP ALUM 28000UF 20% 5V FLATPACK	0
336SVL010MDW Cornell Dubilier Electronics	CAP ALUM 33UF 20% 10V SMD	0
PSU40065A Cornell Dubilier Electronics	CAP ALUM 400UF 165V QC TERM	48
381LR391M400J452 Cornell Dubilier Electronics	CAP ALUM 390UF 20% 400V SNAP	0
381LQ391M315K022 Cornell Dubilier Electronics	CAP ALUM 390UF 20% 315V SNAP	0
476SML100M Cornell Dubilier Electronics	CAP ALUM 47UF 20% 100V SMD	378
PSU21635A Cornell Dubilier Electronics	CAP ALUM 216UF 250V QC TERM	325
CGS703U035X4C Cornell Dubilier Electronics	CAP ALUM 70000UF 35V SCREW	0
SLP821M160A4P3 Cornell Dubilier Electronics	CAP ALUM 820UF 20% 160V SNAP	0
THAS431M100AB0C Cornell Dubilier Electronics	CAP ALUM 430UF 20% 100V T/H	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.