The CAP CER 39PF 6KV C0G/NP0 1825 is a type of ceramic capacitor with a capacitance value of 39 pF. It has a voltage rating of 6000V (6kV) and follows the C0G/NP0 class, which indicates it can withstand high temperatures and has low loss characteristics. The capacitor is packaged in an 1825 case size, also known as metric package 4564.