COMPONENT REFERENCE / MLCC
MLCC & ceramic capacitors
A capacitor's printed value is a starting point. The useful value is what remains at the board's voltage, temperature, frequency and age. First choose the dielectric behaviour; then add voltage, mechanical and qualification requirements.
How the range is organised
Dielectric / temperature behaviour
C0G/NP0 (Class I); X5R, X7R, X8R (Class II). This determines temperature behaviour and guides bias/aging questions; it does not establish safety approval.
Electrical rating
Capacitance, tolerance, rated DC/AC voltage, impedance, ripple/self-heating. A higher rated voltage is not a guarantee of a particular DC-bias curve.
Mechanical construction
Standard SMD, flexible termination, open-mode, metal terminal, leaded disc. A leaded ceramic disc is not an MLCC simply because it is ceramic.
Qualification
General purpose, automotive AEC-Q200, X/Y safety approval. Qualification overlays the dielectric and package. Safety-certified ceramic is not a fifth dielectric.
A useful first comparison
| Category | Temperature characteristic | What it is useful for | Main purchasing check |
|---|---|---|---|
| C0G / NP0 | Commonly −55 to +125°C; 0 ±30 ppm/°C | Timing, filters, RF and stable small capacitance | Tolerance, Q/ESR at frequency, layout parasitics |
| X5R | −55 to +85°C; ΔC within ±15% under specified test conditions | Compact bulk and bypass on moderate-temperature rails | Effective capacitance under DC bias and temperature |
| X7R | −55 to +125°C; ΔC within ±15% under specified test conditions | General decoupling with a wider temperature range | Bias curves; X7R does not automatically beat X5R at bias |
| X8R | −55 to +150°C; ΔC within ±15% under specified test conditions | Hot industrial and automotive locations | Exact series life, voltage and body-temperature limits |
| Safety-certified ceramic | Depends on its actual dielectric; X/Y is a safety class | Approved across-line or insulation-related EMI paths | Exact approval, AC voltage, class and leakage budget |
Temperature codes describe a specified capacitance-versus-temperature test. They do not include initial tolerance, DC bias, aging or every operating condition.
Compare the types
C0G / NP0
Choose C0G when a capacitance value sets a frequency, delay or gain and drifting away from that value matters.
Read the guideMLCC & ceramic capacitorsX5R
X5R is useful when you need appreciable capacitance in a small footprint and the component stays within its temperature range.
Read the guideMLCC & ceramic capacitorsX7R
X7R extends the usual X5R temperature range to 125°C. It does not automatically retain more capacitance at your operating voltage.
Read the guideMLCC & ceramic capacitorsX8R and high-temperature MLCCs
X8R is a 150°C temperature-characteristic option. A hot location still needs an exact-series voltage, lifetime and assembly review.
Read the guideMLCC & ceramic capacitorsSafety-certified ceramic
Select these by their approved circuit role, class and voltage. A high DC-voltage ceramic does not become a safety capacitor merely because it withstands a bench test.
Read the guideSOURCING IN CHINA
What Chinese suppliers can offer
For standard values and established package sizes, domestic general-purpose MLCC ranges offer a practical second-source starting point. Compare the delivered cost of an exact bias-qualified part, not just its nominal capacitance. Fenghua also lists flexible-termination, high-Q and safety-approved directions: each addresses a different design problem. Ask for an exact-code quotation, samples and the relevant curves before deciding whether a local alternative is worth qualifying.
Start with the right questions
- Request an exact ordering code and current datasheet.
- Compare samples under your actual electrical and thermal conditions.
- Confirm the supply route, traceability and change-notification arrangements.
These guides explain selection principles. Final decisions require the current datasheet for the exact ordering code, operating conditions and appropriate application testing.
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