What is Polymer Tantalum Capacitors?

 

Introduction of Polymer Tantalum Capacitors

 

Polymer tantalum capacitors, also known as solid tantalum capacitors with conductive polymer electrolyte, are a type of electrolytic capacitor with improved performance characteristics compared to traditional tantalum capacitors. Polymer tantalum capacitors is one kind of tantalum electrolytic capacitors.

 

Introduction of UF Capacitors Polymer Tantalum Capacitors

 

There are many suppliers who offer polymer tantalum capacitors in industry. Like Panasonic, UF Capacitors, Vishay, Kemet, AVX etc.

UF Capacitors is Top 10 manufacturers for capacitors in China. UF Capacitors produce and offer a large variety of tantalum capacitor types for consumer, industrial, automotive, military, and aerospace electronic applications.

Tantalum electrolytic capacitors are the best choice in applications where volumetric efficiency, stable electrical parameters, high reliability, and long service life are primary considerations. The stability and resistance to elevated temperatures of the tantalum/tantalum oxide/manganese dioxide system make solid tantalum capacitors an appropriate choice for today's surface mount assembly technology.

Polymer Tantalum Capacitor provide high voltages and some of the smallest case sizes on the market. These devices offer the ability to operate at high line voltages and withstand high ripple currents. UF Capacitors’ CA55 Polymer Tantalum Capacitor provide greater stability over ambient temperature and applied voltage ranges when compared to MLCC devices. 

Polymer Tantalum Capacitor are available in a wide variety of technologies, including low profile, high CV, and J-lead. These halogen-free capacitors are RoHS, REACH, and conflict free.

 

Introduction of CA55 Polymer Tantalum Capacitor Construction

 

Comparing with standard tantalum capacitors, CA55 Polymer Tantalum Capacitor have many features, it is advanced and newest series of tantalum capacitors. Here below is the construction chart.

 

Main Features of CA55 Polymer Tantalum Capacitor Compare with Standard Solid Tantalum Capacitors

 

• Ability to operate at higher line voltages

• Withstands higher ripple currents

• Greater stability over ambient temperature and applied voltage ranges when compared to MLCC devices

• Can reduce of audible noise in LCD monitors

• Ability to solve LED backlighting height restrictions

• Low profile to fit the design of ultra-slim LCD monitors

• Compliant with RoHS, REACH

• Halogen free

 

Applications for CA55 Polymer Tantalum Capacitors

 

Typical applications are as followings.

• DC/DC converters, audio/sound circuits (mobile phone and base stations, smart phones, MP3 players)

• Power supply inputs, portable electronics (notebook PCs, displays, SSDs, HDDs and USBs, digital cameras

• GPS navigation systems, WiFi modules), telecommunications

• Consumer electronics (analytical and test equipment, high speed servers)

• High voltage applications such as 12 V to 48 V power input rails, densely populated circuits with space restrictions, microprocessor decoupling

• High ripple current applications

 

Main Technical Specifications of CA55 Polymer Tantalum Capacitors

 

Technical Specifications

Technical Data:	All technical data relate to an ambient temperature of +25°℃
Operating Temperature:	-55℃ ~ +105℃
Capacitance Range:	0.68~1000uF at 100 Hz
Capacitance Tolerance:	士20%
Leakage Current DCL:	0.1CV
Resistance to soldering heat:	3x260°C peak for max.10s reflow
Color:	Yellow and Black are available

 

The production process of Polymer Tantalum Capacitors

 

 

 

Pressing and Sintering:

 

The tantalum powder is then pressed under high pressure into a pellet shape, forming a "green" pellet. 

These green pellets are then sintered at high temperatures to create the solid tantalum body. During sintering, 

the tantalum particles fuse together, resulting in a dense and mechanically robust structure.

 

Anode Formation:

 

After sintering, the tantalum pellet is dipped in a bath of manganese nitrate or other suitable salts. This process 

forms a thin insulating layer of tantalum oxide on the surface of the pellet. This oxide layer acts as the dielectric 

of the capacitor.

 

Polymer Coating:

 

Next, the tantalum pellet with the oxide layer is coated with a conductive polymer electrolyte. The conductive polymer

is applied to the surface of the tantalum pellet to improve the capacitor's electrical properties, reduce Equivalent Series 

Resistance (ESR), and enhance reliability.

 

Cathode Attachment:

 

To complete the capacitor structure, the tantalum anode is attached to a lead frame. This lead frame provides the 

external connections for the capacitor.  The cathode terminal is usually made of silver or other conductive materials.

 

Encapsulation:

 

The tantalum capacitor is encapsulated to protect it from environmental factors such as moisture, vibration, and 

mechanical stress. The encapsulation material is typically an epoxy resin that is molded around the capacitor.

 

Marking and Testing:

 

Once the encapsulation is complete, the capacitor is marked with relevant information, such as capacitance value, 

voltage rating, and manufacturer's logo. It then goes through rigorous testing to ensure it meets the specified 

electrical parameters and quality standards.

 

Packaging:

 

The tested and verified capacitors are packaged in reels or trays suitable for automated assembly processes. 

This packaging ensures easy handling during the manufacturing of electronic devices.

 

How to choose polymer tantalum capacitors or standard solid tantalum capacitors?

 

 

Series	Applicable Circuits	Inapplicable Circuits	Voltage Derating	Remark
CA45 Standard Tantalum Capacitors	Energy storage, Low-power filtering, Consumer electronics, Leakage protectors, General audio, Bluetooth wireless devices	High-power filtering (high-power supplies, communications); High-frequency filtering with low circuit impedance	Derating to 30% for filtering circuits, Derating to 50% for energy storage circuits	Do not reverse the polarity, avoid using a multi-meter to test the capacitor, pay attention to the peak temperature and duration of reflow soldering (within -5℃ range of the peak temperature)
CA45U Low ESR Tantalum Capacitors	Industrial control instruments, Medical, Home appliances, Automotive, High-end audio, Bluetooth wireless devices	High-power filtering (high-power supplies, communications)	Derating to 50% for filtering circuits, Derating to 70% for energy storage circuits	Do not reverse the polarity, avoid using a multi-meter to test the capacitor, pay attention to the peak temperature and duration of reflow soldering (within -5℃ range of the peak temperature)
CA55 Polymer Tantalum Capacitors	Industrial control instruments (non-wireless Bluetooth), Medical (non-wireless Bluetooth), Home appliances (non-wireless Bluetooth), Automotive (program control systems), Audio (audiophile-grade), Communications (high-frequency), Solid-state drives (power failure protection), Laptops (chip filtering)	Power meter, energy meter,water meter, Bluetooth wireless devices, Other circuits requires low leakage	Derating to 80% for filtering circuits, Derating to 50% for high-power pulse charging and discharging circuits	Do not reverse the polarity, pay attention to the peak temperature and duration of reflow soldering, ensure moisture storage before reflow soldering to prevent cracking and increased leakage current after reflow soldering

 

PS. If the original voltage rating is 100V, derating to 30% means that it can only be used up to 30V.

 

How to Obtain a Quote from UF Capacitors?

 

You can easily send an email to sales@ufcapacitors.com , the engineering and sales team in UF Capacitors will help you select the correct polymer tantalum capacitors.

Actually, for some application or circuit, standard solid tantalum capacitors are more suitable. While for some other circuit or application, polymer tantalum capacitors are more suitable