Convert Capacitance to Code
Tolerance
Invalid Ceramic code format. Check values or EIA-198 rules.
Warning: Low multiplier indicators (8 or 9) are subject to manufacturer variance. Verify using an LCR meter.
RESULTS
Input Parameters Specification
Capacitance CodeStandard 3-digit numeric code, decimal point system (R), or two-character EIA-198 scale.
Capacitance ScaleNatively evaluated and converted to standard ratings: Picofarads (pF), Nanofarads (nF), or Microfarads (µF).
Tolerance StandardIdentifies the limits of variation represented by J (±5%), K (±10%), M (±20%), or custom precision classifications.
Working Voltage PrefixOptional preceding letter indicating standardized safe operating DC voltage limits.
Practical Operational Examples
104 Standard Bypass (100 nF)
Decodes as 10 × 10^4 pF = 100,000 pF (100 nF). Typical coupling capacitor utilized on microcontroller power grids.
2R2 Sub-Pico Chip (2.2 pF)
The letter 'R' operates as a decimal point, resulting in 2.2 pF. Used in high-frequency RF tuned tanks.
S3 EIA-198 Code (4.7 nF)
EIA alphanumeric marking: 'S' maps to 4.7, multiplied by 10^3 pF, yielding 4,700 pF (4.7 nF).
A103 High-Voltage Core (10 nF, 10V)
EIA marking combining prefix 'A' (10V) with capacitance 103 (10 nF) in space-saving layouts.
Diagrams & Theory
Ceramic chip capacitors (MLCCs) consist of alternating layers of metallic electrodes and ceramic dielectric material. Due to their small package size, traditional printed textual values are replaced by EIA shorthand codes.
Understanding Class 1 (highly stable temperature-compensated dielectrics like C0G/NP0) versus Class 2 (high volumetric capacity but thermal-sensitive like X7R, Y5V) is essential for filtering and RF matching networks.
Formulas & Mathematical Logic
For 3-Digit System: Capacitance (pF) = (Digit 1 × 10 + Digit 2) × 10^Multiplier
For 'R' Notation: Represents decimal point directly scaled in Picofarads (pF)
EIA-198 Alphanumeric: Base value letter-map value × 10^Multiplier (in pF)
Step-by-Step Example
Example: Decoding a "103K" Ceramic Capacitor
Step 1: Extract the first two numbers as base values: "10".
Step 2: Identify the third digit as multiplier: "3" (representing 10^3 = 1,000).
Step 3: Multiply base value by multiplier: 10 × 1,000 = 10,000 pF = 10 nF.
Step 4: Decode trailing letter "K": maps to standard precision tolerance of ±10%.
How to Use This Calculator
Locate the printed numeric or EIA characters on the ceramic capacitor casing.
Type the alphanumeric code directly inside the dark input window on the chip cap visualizer.
The calculated values, working voltage limits, and limits are updated instantly.
To compute codes in reverse, input targeted parameters into the bottom conversion grids.
About This Calculator
Evaluate active capacitor parameters with highest precision.
This light, self-contained calculator supports 3-digit coding, fractional picofarad codes, and EIA-198 classifications.
Using proper components ensures matching voltage coefficients and optimal ripple current handling in DC-DC converters and high-speed communication rails.
Standards ParityResolves EIA, JEDEC, and European Pro Electron standard structures.
Visual VerificationThe MLCC clay-body graphic adapts to inputs dynamically.
Range BoundsCalculates maximum and minimum operational boundaries.
Privacy GuaranteeCalculations run natively on your client browser with zero tracker dependencies.
Tip: Standard ceramic capacitors have significant voltage coefficient de-rating; always check capacitance shift under DC bias.
Frequently Asked Questions
1. What is the difference between Class 1 and Class 2 ceramic capacitors?
Class 1 capacitors (e.g., C0G, NP0) have zero voltage-dependent change and low drift over temperature, ideal for precision resonant loops. Class 2 capacitors (e.g., X7R, X5R) offer high density but exhibit changes under DC bias.
2. What does 'R' signify in ceramic capacitor markings?
The character 'R' represents a decimal placement in Picofarads. For example, "4R7" indicates 4.7 pF.
3. How are tolerances evaluated if no trailing letters are specified?
If no tolerance character is printed on the core, default standard margins can range between ±10% and ±20% depending on the dielectric class.
4. Why do ceramic capacitors de-rate under DC voltage?
Class 2 high-K ferroelectric materials suffer from a phenomenon known as DC bias effect, where the effective capacitance drops substantially as operating voltage approaches maximum ratings.