A ceramic capacitor with the designation of CAP CER 820PF 630V X7R 1210 has a capacitance value of 820 picofarads, tolerance of ±10%, and a maximum operating voltage of 630 volts. The X7R rating signifies its temperature coefficient characteristics in accordance with the EIA-94 specification, while the 1210 (3225 Metric) designation refers to the component's physical dimensions.