Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
LGX2W221MELB35 Nichicon	CAP ALUM 220UF 20% 450V SNAP	171
LGR2E821MELB50 Nichicon	CAP ALUM 820UF 20% 250V SNAP	174
UHV1E222MHD Nichicon	CAP ALUM 2200UF 20% 25V RADIAL	173
USF1A101MDD1TA Nichicon	CAP ALUM 100UF 20% 10V RADIAL	0
URS1J101MPD Nichicon	CAP ALUM 100UF 20% 63V RADIAL	529
UVZ2V221MRD Nichicon	CAP ALUM 220UF 20% 350V RADIAL	0
UKT1A332MHD1TO Nichicon	CAP ALUM 3300UF 20% 10V RADIAL	8
USW1A470MDD Nichicon	CAP ALUM 47UF 20% 10V RADIAL	3030
UPM1V181MPD Nichicon	CAP ALUM 180UF 20% 35V RADIAL	5811
UVK1C472MHD Nichicon	CAP ALUM 4700UF 20% 16V RADIAL	0
UPJ1C222MHD Nichicon	CAP ALUM 2200UF 20% 16V RADIAL	398
UCZ2A221MNS1MS Nichicon	CAP ALUM 220UF 20% 100V SMD	0
LLS2W331MELC Nichicon	CAP ALUM 330UF 20% 450V SNAP	200
UPM2A820MPD Nichicon	CAP ALUM 82UF 20% 100V RADIAL	141
UPT2G560MHD Nichicon	CAP ALUM 56UF 20% 400V RADIAL	8
UKT1HR33MDD1TD Nichicon	CAP ALUM 0.33UF 20% 50V RADIAL	1840
UCZ2A301MNQ1MS Nichicon	CAP ALUM 300UF 20% 100V SMD	0
UHW0J332MPD Nichicon	CAP ALUM 3300UF 20% 6.3V RADIAL	1099
UKL1V221KPD Nichicon	CAP ALUM 220UF 10% 35V RADIAL	239
LKG1J152MESZBK Nichicon	CAP ALUM 1500UF 20% 63V 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.