Capacitor certification mark picture

The marking of a bar is used to denote the polarity of the capacitor indicating the negative terminal. Markings of leaded tantalum capacitor: The unit, “Microfarad (µF)” is used to mark the values in the leaded tantalum capacitors. An example of a typical marking observed on a capacitor is “22 and 6V”.

Numerical Markings One of the most common formats for capacitor markings is the numerical code. This is typically a series of three or four digits, which represent the capacitance value and sometimes the tolerance. Three-digit code: The first two digits represent the significant figures, and the third digit indicates the number of zeros to add.

On a circuit board, capacitor markings are used to indicate the correct orientation for installing polarized capacitors, such as electrolytic capacitors, tantalum capacitors, and polymer capacitors. These capacitors have positive and negative terminals that must be correctly aligned with the PCB's design to ensure they function as intended.

Markings on the PCB: Positive Marking: Often represented by a “+” symbol, indicating where the positive terminal of the capacitor should be placed. Negative Marking: Typically denoted with a “-“ symbol or sometimes a black stripe. The negative terminal of the capacitor should align with this marking.

The EIA (Electronic Industry Alliance) has also been playing a crucial role in providing standardized systems of marking the capacitors which can be followed as a standard in the industry. As discussed above, there are various factors and standards which are followed while marking the capacitors.

For more detailed testing, an ESR (Equivalent Series Resistance) meter can be used to test the capacitor's health, checking for increased resistance that can indicate aging or failure. 6. What Happens if the Capacitor is Too High? Using a capacitor with a capacitance value much higher than required can lead to performance issues.