Tantalum Capacitors

Part Number	Description / PDF	Quantity
T491B226K010AT4280 KEMET	CAP TANT 22UF 10% 10V 1411	0
T494D226K025AT KEMET	CAP TANT 22UF 10% 25V 2917	767
T491A334K025AT KEMET	CAP TANT 0.33UF 10% 25V 1206	4207
T491B107K004AT7280 KEMET	CAP TANT 100UF 10% 4V 1411	0
T353E106K025AS KEMET	CAP TANT 10UF 10% 25V RADIAL	0
T494A334K025AT KEMET	CAP TANT 0.33UF 10% 25V 1206	815
T491X227K010AT2478 KEMET	CAP TANT 220UF 10% 10V 2917	0
T491A105M025AT4280 KEMET	CAP TANT 1UF 20% 25V 1206	0
T356A105J025AT7301 KEMET	CAP TANT 1UF 5% 25V RADIAL	1451
T494C105K050AT KEMET	CAP TANT 1UF 10% 50V 2312	5537
T110A225K020AS KEMET	CAP TANT 2.2UF 10% 20V AXIAL	0
T355A224K050AS KEMET	CAP TANT 0.22UF 10% 50V RADIAL	463
T491X477K006AT4539 KEMET	CAP TANT 470UF 10% 6.3V 2917	0
T491C157K006AT KEMET	CAP TANT 150UF 10% 6.3V 2312	0
T491B106K020AT4860 KEMET	CAP TANT 10UF 10% 20V 1411	0
T491D476M016AT4081 KEMET	CAP TANT 47UF 20% 16V 2917	0
T491B225M020AH KEMET	CAP TANT 2.2UF 20% 20V 1411	0
T495B105K035ATE1K7 KEMET	CAP TANT 1UF 10% 35V 1411	1075
T491A475M016AG KEMET	CAP TANT 4.7UF 20% 16V 1206	0
T354F226M016AS KEMET	CAP TANT 22UF 20% 16V RADIAL	0

Tantalum Capacitors

Tantalum capacitors are a type of electrolytic capacitor known for their high capacitance density, stability, and reliability. Utilizing tantalum metal as the anode material, these capacitors form a thin insulating oxide layer as the dielectric, enabling efficient charge storage in compact sizes. Their ability to maintain stable capacitance under varying temperatures and voltages makes them critical components in modern electronics, particularly in applications requiring long-term performance and miniaturization, such as consumer electronics, automotive systems, and medical devices.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Solid Electrolyte Tantalum Capacitors	High reliability, low leakage current, and stable performance at elevated temperatures	Power supply circuits in smartphones, laptops, and industrial control systems
Wet Electrolyte Tantalum Capacitors	High capacitance values, excellent stability over time	Aerospace systems, military equipment, and high-reliability energy storage
Polymer Electrolyte Tantalum Capacitors	Low equivalent series resistance (ESR), improved safety, and vibration resistance	Medical implants (e.g., pacemakers), automotive sensors, and high-frequency circuits

3. Structure and Composition

A typical tantalum capacitor consists of four key components:

Anode: Sintered tantalum metal pellet with porous structure for increased surface area.
Dielectric: A thin layer of tantalum pentoxide (Ta₂O₅) formed electrochemically on the anode surface.
Electrolyte: Conductive material (solid MnO₂, liquid electrolyte, or conductive polymer) serving as the cathode.
Encapsulation: Epoxy resin or ceramic casing for mechanical protection and electrical insulation.

This layered structure ensures high capacitance density while maintaining stability under thermal and electrical stress.

4. Key Technical Specifications

Parameter	Description	Importance
Capacitance (C)	Range: 0.1 F to 1000 F	Determines energy storage capacity and filtering effectiveness
Rated Voltage (V_R)	Typically 2.5V to 50V	Defines safe operating voltage range without dielectric breakdown
Leakage Current	Typically < 0.01 C V_R A	Affects circuit efficiency and long-term reliability
Equivalent Series Resistance (ESR)	0.1 to 10 (varies by type)	Impacts high-frequency performance and thermal dissipation
Operating Temperature Range	-55 C to +125 C	Determines suitability for industrial and automotive applications

5. Application Fields

Consumer Electronics: Mobile phones (decoupling circuits), laptops (power management), and wearable devices.
Automotive: Engine control units (ECUs), ADAS sensors, and infotainment systems.
Medical Devices: Pacemakers, defibrillators, and diagnostic imaging equipment.
Aerospace: Avionics systems, satellite power supplies, and radar equipment.

6. Leading Manufacturers and Representative Products

Manufacturer	Product Series	Key Features
AVX Corporation	TAJ Series	Low ESR polymer capacitors for high-frequency applications
KEMET Electronics	T511 Series	Military-grade wet electrolyte capacitors with extended lifespan
Vishay Intertechnology	TVCQ Series	Automotive-qualified capacitors with AEC-Q200 compliance

7. Selection Guidelines

Key factors to consider when selecting tantalum capacitors:

Operating Conditions: Ensure rated voltage exceeds circuit requirements by 20-50% to prevent voltage spikes.
Temperature Requirements: Choose appropriate dielectric materials for extreme temperature environments.
Size Constraints: Polymer electrolyte types offer lower ESR in smaller packages for space-limited designs.
Reliability Needs: Prioritize hermetically sealed packages for mission-critical applications (e.g., aerospace).
Cost vs. Performance: Solid electrolyte capacitors provide optimal cost-effectiveness for general electronics.

Always verify compliance with industry standards such as MIL-PRF-55365 for military use or AEC-Q200 for automotive applications.

8. Industry Trends and Future Outlook

Key development trends include:

Miniaturization: Advancements in powder sintering technology enable 0603/0402 package sizes with capacitance above 100 F.
High-Temperature Stability: New dielectric materials extend operational limits to 200 C for EV and 5G infrastructure.
ESR Reduction: Conductive polymer electrolytes now achieve ESR below 10m for high-efficiency power systems.
Environmental Compliance: Lead-free terminations and RoHS-compliant encapsulation materials becoming standard.
Integration: Embedded tantalum capacitors in SiP (System-in-Package) modules for advanced computing.

The global market is projected to grow at 6.2% CAGR through 2030, driven by demand in IoT devices, electric vehicles, and medical electronics.