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Ceramic Capacitor Color Code With Temperature Coefficient

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Ceramic Disc Capacitor Color Code with Temperature Coefficient Calculator | Calc
Band Mode
Select bands
Temperature Coeff.
1st Band
2nd Band
Multiplier
Tolerance
DETAILED SPECIFICATIONS
Rated Capacitance
-
Temp. Coefficient
-
Capacitor Tolerance
-
Marking Standard
-

Input Parameters Specification

Band Mode StandardSelect either a legacy 3-Band or a temperature-compensated 5-Band system.
1st / 2nd Digit BandsDecodes the base digits representing significant numeric figures of the internal dielectric capacity.
Temperature CoefficientIndicates how much the nominal capacitance shifts with temperature, measured in ppm/°C.
Tolerance MarginSpecifies the allowable manufacturing variation from the capacitor's nominal rating.

Practical Operational Examples

N750 High-Stability Disc (5-Band)

Decodes with a Violet (N750 -750 ppm/°C) top band. Crucial in compensating for inductor thermal drift in oscillator stages.

NP0 Zero-Drift Tank (5-Band)

Decodes with a Black (0 ppm/°C) top band. Maintains highly stable resonant frequencies across wide thermal variations.

Standard 3-Band Disc (100 pF)

Decodes as Brown (1), Black (0), Brown (x10) without any temperature or tolerance bands. Standard coupling block.

Precision Low-Drift Bypass

Utilizes Grey (+30 ppm/°C) Class 1 ceramic properties to maintain strict phase matching in filtering loops.

Diagrams & Theory

Temperature-stable Class 1 ceramic capacitors (like NP0 or C0G) use a linear, highly predictable coefficient of thermal drift. Color bands at the top of these disc components indicate this thermal index (Tempco), measured in parts-per-million per degree Celsius (ppm/°C).

These components are critical in RF transmitters, receivers, and analog filters to offset the positive thermal drift of copper coils and inductors.

Formulas & Mathematical Logic

Nominal Capacity: Capacitance (pF) = (Digit 1 + Digit 2) × Multiplier
Thermal Drift Equation: ΔC = Nominal Capacity × Tempco × ΔT

Step-by-Step Example

Example: 5-Band Disc - Red (-80 ppm/°C), Red (20), Black (0), Brown (x10), Red (±2%)
Step 1: Read temperature index - Red top band indicates a negative drift of -80 ppm/°C.
Step 2: Read base figures - Digit 1 = 20, Digit 2 = 0. Combine them to get 20 (base value).
Step 3: Multiply by multiplier value - 20 × 10 = 200 pF.
Step 4: Decode tolerance - Red maps to ±2% (acceptable range of 198 pF to 202 pF).

How to Use This Calculator

Choose between 3-Band and 5-Band mode from the top selection dropdown trigger.
Orient your disc capacitor so that the bands read from the top towards the lead wires.
Tap each button to open the responsive iOS scrolling wheel. Select the matching band colors.
The rated capacitance, working voltage limits, and tolerances are decoded instantly.

Frequently Asked Questions

1. What does the top color band represent on a temperature-compensating ceramic disc capacitor?

The top band represents the temperature coefficient, which specifies how much the capacitance value will drift as the surrounding ambient temperature fluctuates (measured in parts per million per degree Celsius, ppm/°C).

2. Why is a negative temperature coefficient (e.g. -750 ppm/°C) useful?

Most copper inductors and circuits expand and increase their values as they heat up. Using a capacitor with a negative temperature coefficient helps offset this shift, keeping the total circuit resonant frequency stable.

3. What does NP0 / C0G signify?

NP0 stands for "Negative-Positive-Zero" (0 ±30 ppm/°C drift), meaning it is virtually immune to temperature shifts. It is the gold standard for high-frequency RF filter stages.

4. What standard tolerance applies to 3-band configurations?

3-band configurations do not indicate temperature coefficient or tolerance directly. They default to standard baseline tolerances of ±20% and are intended for low-voltage, non-critical coupling applications.

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About this tool

Ceramic Capacitor Color Code With Temperature Coefficient is a free online calculator tool. Use it to get instant, accurate results for your electronics calculations.