What are the categories of CBB capacitors?

CBB capacitor, also known as polypropylene film capacitor, is a capacitor made of polypropylene film as the dielectric. It has the advantages of low loss, high insulation resistance, good temperature stability, and frequency characteristics, and is widely used in electronic circuits. The following are the main categories, characteristics, applications, and selection considerations of CBB capacitors:
1、 Classified by medium material
Polypropylene film capacitor (CBB)
Medium: Polypropylene film.
characteristic:
Low loss: The dielectric loss tangent (tan δ) is low, making it suitable for high-frequency applications.
High insulation resistance: high withstand voltage strength, low leakage current.
Good temperature stability: The capacity changes little with temperature.
Application: General filtering, coupling, and bypass circuits.
Common models: CBB13, CBB22, CBB81.
Metallized polypropylene film capacitor (MKP)
Medium: Polypropylene film, with a metal film deposited on the surface as an electrode.
characteristic:
Self healing ability: When local breakdown occurs, the metal film can evaporate and restore insulation.
Compact size: With the same capacity, the volume is smaller than that of foil capacitors.
Wide capacity range: from pF level to μ F level.
Applications: High frequency circuits, pulse circuits, electromagnetic compatibility (EMC) filtering.
Common models: MKP-X2, MKP-Y2, MKP416.
2、 Classified by structure
Foil type CBB capacitor
Structure: Made by winding metal foil as the electrode and polypropylene film as the medium.
characteristic:
Large capacity: suitable for high current applications.
Good stability: Long term use with minimal capacity changes.
Large volume: not suitable for high-density circuit boards.
Applications: Power electronics, industrial control, audio equipment.
Stacked CBB capacitor (MLBBB)
Structure: Multiple layers of polypropylene film and electrodes are alternately stacked.
characteristic:
Compact size: suitable for high-density circuit boards.
Excellent high-frequency characteristics: low equivalent series inductance (ESL) and high self resonant frequency.
Capacity stability: low temperature coefficient.
Applications: 5G base stations, medical equipment, aerospace.
3、 Classified by application scenario
Universal CBB capacitor
Characteristics: Balancing performance and cost, suitable for general electronic circuits.
Application: power filtering, coupling, bypass.
Selection: CBB13, CBB22 series.
High frequency CBB capacitor
Features: Low loss, high self resonant frequency, suitable for high-frequency circuits.
Applications: RF circuits, communication equipment, high-frequency switching power supplies.
Selection: CBB81, MKP-X2 series.
Pulse CBB capacitor
Features: High pulse current tolerance, low inductance.
Applications: laser power supply, electromagnetic pulse weapon, particle accelerator.
Selection: High voltage polypropylene capacitors or specially designed pulse capacitors.
CBB capacitors (X2/Y2) for suppressing power electromagnetic interference
Features: Compliant with safety standards (such as UL, ENEC), used to suppress power line interference.
Applications: Home appliances, industrial equipment, LED lighting.
Selection: MKP-X2, MKP-Y2 series.
4、 Classified by packaging form
Direct insertion CBB capacitor
Features: The pins are soldered through the circuit board, suitable for early design or high-density insertion.
Application: Industrial control, maintenance and replacement scenarios.
SMD CBB capacitor
Type: 1206, 1210, 1812, etc. (size code, in inches).
Features: Small size, light weight, suitable for automated surface mounting.
Applications: Smartphones, laptops, 5G base stations.
5、 Key parameters for selection
Rated voltage: It should be 1.25 times higher than the actual working voltage (such as selecting a 315V capacitor for a 250V circuit).
Capacity: Choose based on filtering or energy storage requirements, excessive capacity may increase costs.
ESR: High frequency circuits should choose models with ESR<10m Ω.
Temperature range: For extreme environments, products should be selected between -55 ℃ and+125 ℃.
Package size: In space limited scenarios, surface mount or miniaturized packaging is preferred.
Safety certification: X2/Y2 capacitors must comply with safety standards such as UL and ENEC.
6、 Typical application scenarios
Power electronics: High voltage direct current transmission (HVDC) systems use foil type CBB capacitors to ensure high current filtering.
High frequency communication: 5G base stations use stacked CBB capacitors to resist high-frequency signal loss.
Home appliances: LED lighting uses X2/Y2 capacitors to suppress power line interference.
Medical equipment: The MRI power supply system uses high-frequency CBB capacitors to reduce power supply noise.
By reasonable classification and selection, CBB capacitors can fully leverage their advantages of low loss, high frequency, and high stability to meet diverse circuit requirements.