Aluminum - Polymer Capacitors

Part Number	Description / PDF	Quantity
870135174006 Würth Elektronik Midcom	CAP ALUM POLY 1000UF 6.3V T/H	224
875075361006 Würth Elektronik Midcom	CAP ALUM POLY 680UF 20% 16V SMD	276
875105844002 Würth Elektronik Midcom	WCAP-PSLP ALUMINUM POLYMER CAP	0
875075661009 Würth Elektronik Midcom	WCAP-PSLC ALUMINUM POLYMER CAP	0
875115952001 Würth Elektronik Midcom	WCAP-PSHP ALUMINUM POLYMER CAP	0
870056175004 Würth Elektronik Midcom	WCAP-PTHR ALUMINUM POLYMER CAP	0
875105744003 Würth Elektronik Midcom	WCAP-PSLP ALUMINUM POLYMER CAP	1188
875105144010 Würth Elektronik Midcom	CAP ALUM POLY 330UF 20% 6.3V SMD	0
875105240002 Würth Elektronik Midcom	CAP ALUM POLY 15UF 20% 10V SMD	159
875115655011 Würth Elektronik Midcom	WCAP-PSHP ALUMINUM POLYMER CAP	0
870025375010 Würth Elektronik Midcom	CAP ALUM POLY 820UF 20% 16V T/H	93
870055775006 Würth Elektronik Midcom	CAP ALUM POLY 56UF 20% 50V T/H	0
870055673002 Würth Elektronik Midcom	CAP ALUM POLY 22UF 20% 35V T/H	1404
875075361005 Würth Elektronik Midcom	CAP ALUM POLY 470UF 20% 16V SMD	448
870055674006 Würth Elektronik Midcom	CAP ALUM POLY 56UF 20% 35V T/H	8
875075761007 Würth Elektronik Midcom	WCAP-PSLC ALUMINUM POLYMER CAP	0
870055875003 Würth Elektronik Midcom	CAP ALUM POLY 33UF 20% 63V T/H	232
875115657008 Würth Elektronik Midcom	WCAP-PSHP ALUMINUM POLYMER CAP	0
870235174002 Würth Elektronik Midcom	CAP ALUM POLY 470UF 20% 6.3V T/H	315
875075755002 Würth Elektronik Midcom	WCAP-PSLC ALUMINUM POLYMER CAP	0

Aluminum - Polymer Capacitors

1. Overview

Aluminum polymer capacitors are a type of electrolytic capacitor utilizing conductive polymer materials as the cathode. Compared to traditional liquid electrolyte capacitors, they offer lower equivalent series resistance (ESR), longer operational lifespan, and improved stability. Their hybrid structure combining aluminum oxide dielectric and polymer electrolytes makes them critical components in modern electronics for power filtering, signal decoupling, and energy storage applications.

2. Main Types & Functional Classification

Type	Functional Features	Application Examples
SMD Aluminum Polymer Capacitors	Surface-mount design with compact size and low profile	Smartphones, laptops, VR devices
Leaded Aluminum Polymer Capacitors	Radial/axial leads with high current handling capability	Power supplies, industrial inverters
High Voltage Polymer Capacitors	Rated voltage 100V with reinforced dielectric layers	Automotive ECUs, solar inverters
Low ESR Polymer Capacitors	ESR values < 10m for high-frequency filtering	Server motherboards, GPU power modules

3. Structure & Composition

The typical construction includes:

Anode: High-purity aluminum foil with etched surface for increased area
Dielectric: Thin aluminum oxide layer (Al O ) formed through electrochemical oxidation
Cathode: Conductive polymer (e.g., PEDOT:PSS) combined with graphite/carbon layer
Electrolyte: Solid polymer matrix with high ion conductivity
Encapsulation: Aluminum casing with rubber sealing for moisture protection

4. Key Technical Specifications

Parameter	Description	Importance
Capacitance Range	Typically 10 F to 3300 F	Determines energy storage capacity
Rated Voltage	2.5V to 100V DC	Defines maximum operating voltage
ESR (Equivalent Series Resistance)	3m to 150m	Affects high-frequency filtering efficiency
Ripple Current	100mA to 5Arms	Crucial for power supply stability
Operating Temperature	-55 C to +105 C	Determines environmental durability
Lifetime	5000 to 15000 hours @ 105 C	Impacts product reliability

5. Application Fields

Consumer Electronics: Smartphones, gaming consoles, wearables
Automotive Systems: ADAS controllers, battery management systems
Industrial Equipment: CNC machines, servo drives, PLCs
Telecom Infrastructure: 5G base stations, optical network terminals
Medical Devices: MRI scanners, portable diagnostic equipment

6. Leading Manufacturers & Products

Manufacturer	Product Series	Key Features
Nichicon	UPW Series	105 C, 3000hrs, ultra-low ESR (5m )
Chemicon	SP-Cap	High ripple current: 2.5A@100kHz
Panasonic	FC-F Series	Conductive polymer hybrid technology
AVX	TACMicro	Military-grade reliability (MIL-STD-883)
Samsung Electro-Mechanics	CA Series	0805 case size with 220 F capacitance

7. Selection Guidelines

Key considerations:

Capacitance & Voltage Margin: Select 20% higher than circuit requirements
ESR Requirements: Critical for switching power supplies (e.g., VRMs require <20m )
Thermal Management: Derate ripple current at temperatures >85 C
Package Constraints: SMD preferred for mobile devices, through-hole for high-current applications
Cost Optimization: Balance polymer content vs. performance needs

Case Study: Selecting a 470 F/16V capacitor for a GPU power circuit requires ESR <15m and 105 C rating.

8. Industry Trends

Development of nanocomposite polymers for ESR reduction to sub-5m levels
Miniturization: 0603 SMD case achieving 100 F+ capacitance
High-temperature tolerance: 125 C operational capability
Biodegradable polymer electrolytes for eco-friendly manufacturing
Embedded capacitor technology for 3D IC packaging
AI-driven lifetime prediction models for reliability optimization