Can I use MLCC capacitors in a AC circuit?

2024-03-10

Can I use MLCC capacitors in a AC circuit? The answer is Yes.

You can use MLCC (Multi-Layer Ceramic Capacitors) in AC circuits, but there are some important considerations to keep in mind:

Voltage Rating: Ensure that the MLCC's voltage rating is appropriate for the AC circuit. MLCCs are available in various voltage ratings, so choose one that exceeds the peak voltage of your AC circuit to prevent breakdown.

please make sure the Vp-p value and Vo-p value including DC-bias for the applied voltage remains within the rated voltage.When applying or removing voltage, abnormal voltages, such as resonance or surge may occur transiently. The rated voltage should not be surpassed when this abnormal voltage occurs.

Capacitance Value:  Select an MLCC with a capacitance value suitable for your AC circuit's requirements. MLCCs come in a wide range of capacitance values, so choose one that meets your circuit's needs. Also, when using capacitors with high-frequency voltage, pulse voltage, or the like, dielectric loss may cause self-heating. The load should be within a range such that, when measuring at an ambient temperature of 25°C, the product’s self-heating remains below 20°C and the surface temperature of the capacitor in the actual circuit remains below the maximum rated temperature.
Note: The capacitor can be destroyed if the actual temperature rises only a few degrees above the limit, so either check using the simulation tool or contact Hongda Sales Team to confirm suitability.

Frequency Response: MLCCs have different frequency response characteristics. Ensure that the MLCC you choose is suitable for the frequency range of your AC circuit. MLCCs typically work well in AC circuits with frequencies up to several megahertz, but their performance may degrade at higher frequencies.

Temperature Considerations: MLCCs have temperature dependencies that may affect their performance in AC circuits, especially if the circuit operates at high temperatures. Consider the temperature range in which your circuit will operate and choose an MLCC with appropriate temperature characteristics.

Dielectric Absorption: MLCCs may exhibit dielectric absorption, which can cause a temporary voltage drop after a high voltage is applied and removed. This characteristic may affect the performance of your AC circuit, so consider it when selecting an MLCC.

Parasitic Effects: Like all capacitors, MLCCs have parasitic effects such as equivalent series resistance (ESR) and equivalent series inductance (ESL). These effects can impact the performance of your AC circuit, particularly at high frequencies. Choose capacitors with low ESR and ESL for better AC performance.

Mounting Considerations: MLCC capacitors are typically surface mount components. Ensure proper mounting and layout to minimize parasitic effects and ensure good electrical performance.

Safety Considerations: Ensure that the chosen MLCC capacitors comply with relevant safety standards and regulations, especially if used in applications where safety is critical.

Overall, MLCCs can be suitable for use in AC circuits, but it's essential to choose the right MLCC with appropriate specifications for your specific application to ensure reliable performance and safety. If you have any doubts or specific requirements, consulting with an electronics engineer or specialist is recommended.

Hongda Capacitors offer MLCC in case size from 0201 to 2220, capacitors varies from 0.1pF to 220uF, Voltage from 2.5V to 6000V. We keep a wide range regular stock, please contact us to check best price and lead time. Please reach at me here: emily@hongdacap.com.hk Thank you.