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If surface-mount capacitors are the heart of electronic circuits, then their parameters are their soul, as the quality of electronic components and their suitability for a particular circuit are determined by various parameter values of these surface-mount capacitors. SMD capacitors have 6 key parameters; let’s take a look at exactly which 6 parameters those are. 1. Capacitance and tolerance: These refer to the range of allowable deviations between the actual capacitance and the rated capacitance value. Common capacitor tolerances come in three grades: J grade, K grade, and M grade, corresponding to ±5%, ±10%, and ±20% respectively. 2. Rated operating voltage: This refers to the voltage level at which a surface mount capacitor can operate properly over a long period of time. It is the voltage value that can be tolerated under such conditions; it is also known as the \"voltage tolerance.\" When the structure, manufacturing materials, and dielectric are all the same, the higher the voltage tolerance of a surface mount capacitor, the larger its size will be. 3. Temperature coefficient: The lower the temperature coefficient, the better, as capacitors are affected by temperature. For every degree change in temperature, the capacitance also changes accordingly; high temperatures cause the capacitance of the capacitor to decrease. 4. Insulation resistance: Insulation resistance is generally used to indicate the level of leakage current. Naturally, the higher the insulation resistance, the better, as this results in a lower leakage current. Generally, resistors with a small capacitance have very high insulation resistance, whereas capacitors with values of a few hundred ohms or a few thousand ohms have low insulation resistance and higher leakage current. 5. Loss value: It refers to the amount of energy consumed by surface-mounted capacitors due to heat generation during operation per unit of time. These losses mainly stem from dielectric loss and metal loss. 6. Frequency characteristics: The electrical parameters of surface-mounted capacitors change as the frequency of the electric field varies. In high-frequency environments, the dielectric constant of such capacitors is lower than at low frequencies; consequently, their capacitance decreases, and losses increase as the frequency rises.