All component comparisons
Ceramic vs Tantalum Capacitor
Capacitor (ceramic / MLCC) and Capacitor (tantalum) compared — what each is better at, and which one the job actually calls for.
Ceramic (MLCC) is the cheapest, smallest and best-behaved at high frequency — but a class-2 dielectric can lose a large fraction of its rated capacitance under DC bias, which catches people out badly in small packages. Tantalum holds its value steadily across voltage and temperature in a small can, which is why it survives on analogue rails, but it fails short-circuit and sometimes spectacularly, so it needs serious voltage derating.
What each one is
Capacitor (ceramic / MLCC)
Stores energy in an electric field. Ceramic caps are small, cheap, non-polarised, and the workhorse for filtering and decoupling.
Capacitor (tantalum)
A polarized capacitor that uses tantalum metal for its electrodes, offering high capacitance per volume and stable performance. Commonly used in power supply filtering and timing circuits.
Key specs
Capacitor (ceramic / MLCC)
- Capacitance(Farad (F))
- How much charge it stores. Usually pF, nF or uF.
- Voltage rating(V)
- Max voltage before breakdown. Pick at least 2x your working voltage.
- Tolerance(%)
- Variation from marked value; ceramics can be loose (±10-20%).
- Dielectric class(-)
- C0G = stable/precise; X7R = general; Y5V = bulk but drifts with temp/voltage.
Capacitor (tantalum)
- Capacitance(Farad (F))
- Charge storage capacity. Common values: 1µF to 100µF, up to 1000µF.
- Voltage rating(Volt (V))
- Max DC voltage before breakdown. Must be > circuit operating voltage.
- Tolerance(%)
- How far the real value can stray from marked value (e.g. ±10%, ±20%).
- ESR(Ohm (Ω))
- Equivalent Series Resistance. Lower is better for power filtering.
- Leakage current(µA)
- Current that flows when voltage is applied. Should be very low.
Types you will meet
Capacitor (ceramic / MLCC)
- MLCC (multilayer chip)
- Disc ceramic
- Class 1 (C0G/NP0 - stable)
- Class 2 (X7R/Y5V - higher capacity, less stable)
Capacitor (tantalum)
- Molded tantalum
- SMD tantalum
- Wet tantalum
- Solid tantalum
- Tantalum polymer
How to choose
Capacitor (ceramic / MLCC)
Decoupling -> 100nF near each IC. Filtering -> match to cutoff frequency. Always voltage rating >= 2x working voltage. Use C0G for timing/precision.
Capacitor (tantalum)
1) Determine needed capacitance and voltage. 2) Select voltage rating > circuit max. 3) Check ESR for power apps. 4) Consider tolerance for timing circuits. 5) Observe polarity!
How each one fails
Capacitor (ceramic / MLCC)
Cracks (mechanical/thermal) cause shorts; capacitance drops with applied DC voltage (X7R/Y5V).
Capacitor (tantalum)
Short-circuit from voltage spikes or reverse polarity (often catastrophic). Capacitance loss or increased ESR over time. Visible: bulging, discoloration, or leakage.
Full reference for each part
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