The electrical characteristics of CBB capacitors (metalized polypropylene film capacitors) are determined by their materials and structure. Based on industry technical specifications and application practices, the core characteristics can be summarized into the following five categories:
1、 Basic electrical performance parameters
Capacity and voltage range
Capacity span: 10pF~10 μ F, covering a wide range of needs from precision signal circuits to power filtering.
Voltage withstand level: 63V~2000V (DC or AC), with high voltage models such as CBB81 designed specifically for 1kV~2kV scenarios.
Nominal rule: Following E6/E12 series (e.g. 104=0.1 μ F), without non-standard capacities such as 344, 354, etc.
Loss and stability
Tangent value of dielectric loss angle (tan δ): as low as 10 ⁻⁴ (better than 10 ⁻ ³ for polyester capacitor CL), with minimal energy loss at high frequencies.
Insulation resistance:>10G Ω, effectively suppressing leakage current (typical value ≤ 10 μ A).
Frequency response: The capacitance and loss are basically unaffected by frequency within the range of 1kHz~1MHz.
2、 High frequency characteristic advantage
Low impedance design
Non inductive winding structures (such as CBB13, CBB81) reduce parasitic inductance and are suitable for MHz level switch circuits.
Axial packaging (CBB19/CBB20) further reduces high-frequency losses and has a distortion rate of less than 0.1% when used in audio dividers.
Signal fidelity capability
Low dielectric absorption coefficient (<0.05%), avoiding residual voltage during signal coupling and ensuring the accuracy of analog circuits.
3、 Self healing mechanism and reliability
Self healing properties
When local breakdown occurs, the metal layer around the breakdown point oxidizes to form an insulating zone, restoring the insulation strength (recovery time<10 μ s).
After self-healing, the capacity loss is less than 0.1%, which does not affect the circuit function (such as the long-term stability of CBB22 in energy-saving lamp circuits).
Lifespan and Durability
Temperature lifespan: ≥ 5000 hours at 105 ℃ environment (CBB61 plastic shell packaging).
Explosion proof design: The metal shell model (CBB60/CBB65) has a built-in pressure relief groove, which can safely release gas in case of overpressure.
4、 Temperature and environmental adaptability
Characteristic performance application scenarios
The temperature coefficient is relatively high (-250~+100ppm/℃), and its stability is weaker than that of polystyrene capacitors, requiring temperature compensation circuits
High temperature withstand working temperature -40 ℃~+105 ℃ (supported by CBB65 metal shell+110 ℃) Industrial motors and charging stations
Moisture and heat performance plastic shell packaging (MPB type) has better moisture resistance than resin packaging for outdoor lighting fixtures and electrical appliances in humid environments
5、 Security features and application limitations
Safety certification capability
Box type X2/Y2 capacitors have passed UL/ENEC certification, with a withstand voltage of 4kV (X2 level), and meet safety isolation requirements while suppressing EMI.
Limitations
Avoid DC bias: In AC applications, it is necessary to ensure that the superimposed DC component is less than 50% of the rated voltage to prevent accelerated aging.
Derating design: Voltage derating of 30% is required in high temperature environments (>85 ℃), such as 630V capacitors with actual operating voltage ≤ 440V.
Summary of Characteristics and Application Association Table
Core Features, Technical Indicators, Typical Application Scenarios, Representative Models
Low dielectric loss tan δ ≤ 0.0005 (1kHz) high-frequency filtering (5G base station) Murata GQM series
High voltage self-healing withstand voltage of 2kV, self-healing energy ≤ 10mJ inverter IGBT buffer CBB81
High ripple current withstand ripple current ≥ 5A (100kHz) photovoltaic inverter DC Link EPCOS B256xx
Axial insensitive design ESL ≤ 5nH sound divider CBB20
Long life explosion-proof life 100000 hours (70 ℃) industrial compressor motor CBB65
Design Tip:
Capacity selection: The capacitance reduction circuit needs to calculate its capacity based on the load current (e.g. 0.47 μ F capacitor provides ≈ 30mA current);
High frequency substitution: NP0 ceramic capacitors can be used in scenarios above 1MHz, but the cost of CBB is lower when the capacity is greater than 0.1 μ F.
The electrical characteristics of CBB capacitors make them a key component for analog circuits, high-frequency power supplies, and motor control. When selecting, it is necessary to weigh the voltage margin, temperature range, and self-healing requirements to leverage their advantages of low loss and high reliability.
