Surface mount capacitors

As a type of electrolytic capacitor, SMT tantalum capacitors are widely used in various electronic products. Due to the use of metallic tantalum or niobium as a dielectric, tantalum capacitors do not require the use of electrolyte like ordinary electrolytic capacitors, so they have the characteristic of high temperature resistance. The trend of tantalum capacitor business continues to be the increase in molded chips and the decrease in coating and through-hole technology. Surface mounted capacitors are affected by lead-free soldering conditions, therefore the molding compound used should provide higher levels of MSL performance.

The primary elements used for surface mount capacitors are tantalum and niobium. Each has there pros and cons. Though tantalum has the highest capacitance density, it will burn on failure, whereas niobium doesn't. Niobium is also considerably less expensive and more readily available, but can never match the capacitance density offered by tantalum.

Characteristics of surface mounted capacitors：

Made from tantalum or niobium

High price and small size

Wide temperature range and high temperature resistance

Low current and insufficient voltage resistance

Tantalum capacitors will burn out once they fail

Key Material Properties:

Fast cure for high throughput

New materials are developed without halogens

CTE should be between 20-22ppm