Aluminum Electrolytic Capacitors

Part Number	Description / PDF	Quantity
THA742M030AD1C Cornell Dubilier Electronics	THINPACK CAP ALUM 7400 30V	0
105CKH050M Cornell Dubilier Electronics	CAP ALUM 1UF 20% 50V THRU HOLE	7740
MLP123M025EA1A Cornell Dubilier Electronics	CAP ALUM 12000UF 20% 25V FLATPCK	0
DCMC681T450AC2B Cornell Dubilier Electronics	CAP ALUM 680UF 450V SCREW	991
THA161M300AB1C Cornell Dubilier Electronics	THINPACK CAP ALUM 160 300V	0
WBR2-450A Cornell Dubilier Electronics	CAP ALUM 2UF 450V AXIAL	0
336SML035M Cornell Dubilier Electronics	CAP ALUM 33UF 20% 35V SMD	0
CGR212U040R2C Cornell Dubilier Electronics	CAP ALUM 2100UF 40V SCREW	0
380LQ391M350H052 Cornell Dubilier Electronics	CAP ALUM 390UF 20% 350V SNAP	0
229LBB016M2DD Cornell Dubilier Electronics	CAP ALUM 22000UF 20% 16V SNAP	0
THAS412M030AB1C Cornell Dubilier Electronics	THINPACK CAP ALUM 4100 30V	0
SLP152M080A3P3 Cornell Dubilier Electronics	CAP ALUM 1500UF 20% 80V SNAP	0
226RSS035M Cornell Dubilier Electronics	CAP ALUM 22UF 20% 35V THRU HOLE	3874
158KXM016M Cornell Dubilier Electronics	CAP ALUM 1500UF 20% 16V T/H	0
SLP183M016A4P3 Cornell Dubilier Electronics	CAP ALUM 18000UF 20% 16V SNAP	0
381LX332M063A012 Cornell Dubilier Electronics	CAP ALUM 3300UF 20% 63V SNAP	622
226CKE450MNV Cornell Dubilier Electronics	CAP ALUM 22UF 20% 450V RADIAL	1650
226CKR100M Cornell Dubilier Electronics	CAP ALUM 22UF 20% 100V THRU HOLE	1440
381LX393M016K052 Cornell Dubilier Electronics	CAP ALUM 39000UF 20% 16V SNAP	0
AFK108M06F24T-F Cornell Dubilier Electronics	CAP ALUM 1000UF 20% 6.3V SMD	354

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.