Tantalum Capacitors

Part Number	Description / PDF	Quantity
CWR11KC475KB KEMET	CAP TANT 4.7UF 10% 25V 2312	0
T491B335K016ATAUTO KEMET	CAP TANT 3.3UF 10% 16V 1411	0
T491C156K010AT4838 KEMET	CAP TANT 15UF 10% 10V 2312	0
T499B684K035ATE6K5 KEMET	CAP TANT 0.68UF 10% 35V 1411	0
T495T336K004ATE1K2 KEMET	CAP TANT 33UF 10% 4V 1411	0
T491A226K010ATAUTO KEMET	CAP TANT 22UF 10% 10V 1206	0
T356G686K006AS KEMET	CAP TANT 68UF 10% 6.3V RADIAL	0
T494X476M025AT KEMET	47.0UF 25.0V	0
T491D227M010AT KEMET	CAP TANT 220UF 20% 10V 2917	129
T494B475M010AT KEMET	CAP TANT 4.7UF 20% 10V 1411	5
T322F476K035AT KEMET	CAP TANT 47UF 10% 35V AXIAL	236
T491X156K035AT KEMET	CAP TANT 15UF 10% 35V 2917	1475
T494U336M010AT KEMET	33.0UF 10.0V	0
T340A475M010AT KEMET	CAP TANT 4.7UF 20% 10V RADIAL	0
T491C106K035AT7280 KEMET	CAP TANT 10UF 10% 35V 2312	0
T354G106M035AS KEMET	CAP TANT 10UF 20% 35V RADIAL	196
T491D157M006ATAUTO KEMET	CAP TANT 150UF 20% 6.3V 2917	0
T350B335K025AS KEMET	CAP TANT 3.3UF 10% 25V RADIAL	0
T354C225K035AT KEMET	CAP TANT 2.2UF 10% 35V RADIAL	1000
T491A475M020AT4380 KEMET	CAP TANT 4.7UF 20% 20V 1206	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.