Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
B43624A2128M002 TDK EPCOS	CAP ALUM 1200UF 20% 200V SNAP	0
ALS81U562NP450 KEMET	CAP ALUM 5600UF 20% 450V SCREW	0
LGN2C182MELB40 Nichicon	CAP ALUM 1800UF 20% 160V SNAP	161
B43540A9127M87 TDK EPCOS	CAP ALUM 120UF 20% 400V SNAP	0
UBY1J182MHL Nichicon	63V 1800UF 20% HIGH TEMP LEADED	88
UBW1H330MPD1TD Nichicon	CAP ALUM 33UF 20% 50V RADIAL	89
EGPA250ELL392ML35S United Chemi-Con	CAP ALUM 3900UF 20% 25V RADIAL	0
EKMQ100ELL333MP50S United Chemi-Con	CAP ALUM 33000UF 20% 10V RADIAL	0
UHV1A681MPD Nichicon	CAP ALUM 680UF 20% 10V RADIAL	0
UPJ1V222MHD6 Nichicon	CAP ALUM 2200UF 20% 35V RADIAL	61
10ML120MEFCT56.3X7 Rubycon	CAP ALUM 120UF 20% 10V RADIAL	0
USF1A680MDD1TP Nichicon	CAP ALUM 68UF 20% 10V RADIAL	0
UPJ1J181MPD Nichicon	CAP ALUM 180UF 20% 63V RADIAL	188
ALS71G472NF500 KEMET	CAP ALUM 4700UF 20% 500V SCREW	0
SEK472M035ST Cornell Dubilier Electronics	CAP ALUM 4700UF 20% 35V RADIAL	0
EEV-TG1K470Q Panasonic	CAP ALUM 47UF 20% 80V SMD	686
ELXS451VSN391MR45W United Chemi-Con	CAP ALUM 390UF 20% 450V SNAP	0
UMP1V2R2MDD1TP Nichicon	CAP ALUM 2.2UF 20% 35V RADIAL	878
URZ2A220MPD Nichicon	CAP ALUM 22UF 20% 100V RADIAL	1731
106TTA035M Cornell Dubilier Electronics	CAP ALUM 10UF 20% 35V AXIAL	77

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.