The most common capacitor chart values rely on the EIA-198 three-digit code system, where the first two digits represent the significant figures and the third digit is the multiplier in picofarads (pF). For example, the ubiquitous 104 code translates to 10 × 104 pF, which equals 100,000 pF, or 100 nF, or 0.1 µF. While reading the base capacitance is straightforward, selecting the right component for a specific circuit requires understanding the accompanying temperature, voltage, and tolerance columns that dictate how that capacitor behaves under real-world bench and field conditions.
The Master Capacitor Chart Values & EIA Code Table
This reference table is based on the EIA-198 / IEC 60062 standard for ceramic and film capacitor marking. How to read this table: The EIA Code column is what you will see printed on the physical component or listed in a bill of materials (BOM). The Significant Digits and Multiplier columns show the underlying math. The final three columns provide the converted values in picofarads (pF), nanofarads (nF), and microfarads (µF) so you can match them to your schematic requirements without doing mental math. Note that values below 10 pF often use an 'R' to denote a decimal point (e.g., 4R7 = 4.7 pF), which is excluded from this standard 3-digit integer table.
| EIA Code | Significant Digits | Multiplier (10^x) | Picofarads (pF) | Nanofarads (nF) | Microfarads (µF) |
|---|---|---|---|---|---|
| 101 | 10 | 1 | 100 pF | 0.1 nF | 0.0001 µF |
| 102 | 10 | 2 | 1,000 pF | 1 nF | 0.001 µF |
| 103 | 10 | 3 | 10,000 pF | 10 nF | 0.01 µF |
| 104 | 10 | 4 | 100,000 pF | 100 nF | 0.1 µF |
| 105 | 10 | 5 | 1,000,000 pF | 1,000 nF | 1.0 µF |
| 221 | 22 | 1 | 220 pF | 0.22 nF | 0.00022 µF |
| 222 | 22 | 2 | 2,200 pF | 2.2 nF | 0.0022 µF |
| 223 | 22 | 3 | 22,000 pF | 22 nF | 0.022 µF |
| 224 | 22 | 4 | 220,000 pF | 220 nF | 0.22 µF |
| 472 | 47 | 2 | 4,700 pF | 4.7 nF | 0.0047 µF |
| 473 | 47 | 3 | 47,000 pF | 47 nF | 0.047 µF |
| 474 | 47 | 4 | 470,000 pF | 470 nF | 0.47 µF |
- 104 (0.1 µF / 100 nF): The universal decoupling capacitor. If you are building digital logic (Arduino, ESP32, 7400-series), you will place one of these as close to the VCC/GND pins of every IC as physically possible to shunt high-frequency switching noise.
- 105 (1.0 µF): The standard bulk bypass cap for low-frequency noise filtering and local energy reservoirs on power rails, frequently paired in parallel with a 104 to cover a broader frequency spectrum.
Decoding Tolerance, Temperature, and Voltage Columns
Knowing the capacitance is only half the battle. When sourcing parts from distributors like Digi-Key or Mouser, which column applies to your installation? If you are designing a precision analog filter or an RF oscillator, the Tolerance and Temperature Coefficient (Tempco) columns are your primary constraints. If you are designing a power supply filter, the Voltage Rating and DC Bias Derating columns dictate your survival.
Temperature Coefficients (EIA RS-198)
Ceramic capacitors are classified by their dielectric material, which defines how their capacitance shifts with temperature. The EIA uses a three-character code for Class II and III dielectrics:
- X7R: X = -55°C minimum, 7 = +125°C maximum, R = ±15% capacitance change. This is the workhorse for general-purpose decoupling.
- X5R: Similar to X7R but rated only to +85°C. Often used in consumer electronics where extreme heat is not expected.
- Y5V: Offers massive capacitance in tiny packages but can lose up to 80% of its value across its temperature range. Avoid these for critical timing or filtering circuits.
- C0G / NP0: Class I dielectric. Extremely stable (±30 ppm/°C). Use these for RF matching networks, precision oscillators, and audio signal paths where Kemet and other manufacturers recommend zero capacitance drift.
How Derating Rows Modify the Base Value
This is where most hobbyists and junior engineers get burned. The capacitance value printed on the chart assumes a specific test condition (usually 0.5V RMS at 1 kHz). In reality, Class II dielectrics (X7R, X5R) suffer from severe DC bias derating. As you apply a DC voltage across the capacitor, the dielectric material saturates, and the effective capacitance plummets.
Imagine a water tank with a flexible rubber bladder inside. At low water pressure (low voltage), the bladder expands fully, holding 10 gallons (10 µF). But as you pump in high water pressure (high DC bias), the bladder compresses tightly against the tank walls, leaving physical room for only 2 gallons of water. The physical tank size hasn't changed, but the effective volume has plummeted.
Take the Murata GRM21BR61E106MA73, a popular 0805-size, 10 µF, X5R capacitor rated for 25V. If you apply 12V DC across it, the datasheet's DC bias curve shows it will only provide roughly 3.5 µF of actual capacitance. If your circuit absolutely requires 10 µF at 12V, you must either step up to a larger physical package (like a 1206 or 1210) or select a capacitor with a much higher voltage rating (e.g., 50V) to keep the operating point in the linear region of the dielectric.
What Standard Capacitor Chart Values Cannot Tell You
While the EIA chart gives you the nominal electrostatic value, it completely ignores the parasitic elements that dictate high-frequency behavior and physical reliability. Here is what the table leaves out, and how you must compensate for it on the bench.
ESR, ESL, and Physical Package Size
A 104 (100 nF) capacitor in a 0402 package and a 104 in a 1206 package have the same nominal capacitance, but vastly different Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL). Smaller packages generally have lower ESL, making them superior for decoupling high-speed microcontrollers (like an ESP32-S3 running at 240 MHz). However, smaller packages also have lower ripple current ratings and higher ESR, which can cause them to overheat and fail in switching power supply output filters. Always cross-reference the manufacturer's datasheet for the specific impedance curve at your target switching frequency.
The Piezoelectric (Microphonic) Effect
Class II dielectrics like X7R and X5R are inherently piezoelectric. When subjected to mechanical vibration, or even acoustic noise, they generate a small voltage across their terminals. Conversely, applying an AC voltage causes them to physically vibrate. If you place a large-value X7R MLCC in the signal path of a high-gain audio amplifier or a sensitive sensor front-end, it will act as a microphone, injecting audible noise into your circuit. For audio coupling and filtering, you must bypass the standard high-K ceramic charts and specify C0G/NP0 ceramics, film capacitors, or specialized soft-termination audio capacitors.
Mains Voltage Safety Certifications
If your installation involves mains voltage (120V/230V AC), standard EIA capacitance charts do not apply to safety-certified components. You must use specifically rated X1/X2 (line-to-line) or Y1/Y2 (line-to-ground) safety capacitors. These components are designed with internal fusing and self-healing metallization to fail open rather than short, preventing fire and shock hazards. Never substitute a standard high-voltage MLCC or film capacitor in a mains EMI filter without verifying its UL/ENEC safety certification marks; local electrical codes and the AHJ (Authority Having Jurisdiction) strictly mandate the use of recognized safety components in mains-connected equipment.
