Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
THAS171M350AD1C Cornell Dubilier Electronics	THINPACK CAP ALUM 170 350V	0
SLPX101M420A3P3 Cornell Dubilier Electronics	CAP ALUM 100UF 20% 420V SNAP	0
MLS561M250EB1C Cornell Dubilier Electronics	CAP ALUM 560UF 20% 250V FLATPACK	0
CGS333U016R4C Cornell Dubilier Electronics	CAP ALUM 33000UF 16V SCREW	0
MLS152M060EK0A Cornell Dubilier Electronics	CAP ALUM 1500UF 20% 60V FLATPACK	0
AFK226M16B12T-F Cornell Dubilier Electronics	CAP ALUM 22UF 20% 16V SMD	1793
SLP121M450A7P3 Cornell Dubilier Electronics	CAP ALUM 120UF 20% 450V SNAP	0
WBR8-250A Cornell Dubilier Electronics	CAP ALUM 8UF 250V AXIAL	0
THA332M030AA1C Cornell Dubilier Electronics	THINPACK CAP ALUM 3300 30V	0
CGS123U030R4C Cornell Dubilier Electronics	CAP ALUM 12000UF 30V SCREW	0
685PUM050M Cornell Dubilier Electronics	CAP ALUM 6.8UF 20% 50V THRU HOLE	0
CGS172T400V4C Cornell Dubilier Electronics	CAP ALUM 1700UF 400V SCREW	0
SLP153M050H9P3 Cornell Dubilier Electronics	CAP ALUM 15000UF 20% 50V SNAP	0
381LR221M450J452 Cornell Dubilier Electronics	CAP ALUM 220UF 20% 450V SNAP	0
380LX223M016H042 Cornell Dubilier Electronics	CAP ALUM 22000UF 20% 16V SNAP	0
PSU2130A Cornell Dubilier Electronics	CAP ALUM 21UF 330V QC TERM	0
SK100M063ST Cornell Dubilier Electronics	CAP ALUM 10UF 20% 63V RADIAL	3935
MLP821M250EB1A Cornell Dubilier Electronics	CAP ALUM 820UF 20% 250V FLATPACK	27
381LQ681M160J012 Cornell Dubilier Electronics	CAP ALUM 680UF 20% 160V SNAP	0
336CKS160M Cornell Dubilier Electronics	CAP ALUM 33UF 20% 160V THRU HOLE	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.