MLCC Voltage Derating Calculator

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MLCC Voltage Derating Calculator

Estimate the maximum safe DC voltage for MLCCs while maintaining the target minimum capacitance, considering dielectric type and package size.

Input Parameters

Nominal Capacitance

Rated Voltage

Target Minimum Capacitance

µF

Dielectric Type

Package Size

Results

Maximum Safe DC Voltage

Estimated Capacitance at Max Voltage

Voltage Ratio

Design Note

Formula

Vmax ≈ Rated Voltage × √(Target Minimum Capacitance / Nominal Capacitance) × Dielectric Factor

Dielectric Factor: C0G/NP0=1.0, X7R=0.8, X5R=0.75, Y5V=0.6 (approximation)

Frequently Asked Questions (FAQ)

Q1: Why derate MLCC voltage?
To avoid excessive capacitance loss or dielectric breakdown.

Q2: How does dielectric type affect derating?
X7R/X5R/Y5V lose capacitance faster under DC bias than C0G/NP0.

Q3: Is this calculation exact?
No, always verify with manufacturer datasheet curves.

Q4: Can multiple MLCCs in parallel increase voltage tolerance?
Only capacitance adds; voltage rating per capacitor remains the same.

Q5: Does temperature affect derating?
Yes, high temperature reduces effective capacitance further.

Q6: Can I use this for Y5V capacitors?
Yes, but expect significant capacitance drop at high DC voltage.

Disclaimer: This calculator is for reference only. Actual MLCC voltage derating depends on manufacturer, series, dielectric, package, temperature, and operating conditions.

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