Products with part numbers beginning with DE1 and containing the letters KX are general-purpose X1/Y1 class safety standard certified lead type ceramic capacitors.
Since the first generation appeared, Type KX capacitors have undergone repeated rounds of miniaturization. At present, the recommended new small size Type KX capacitors utilize halogen-free resin for the package and CP wires. The product lineup includes voltage ratings of AC250V (r.m.s.) and AC300V (r.m.s.).
For details, refer to webpage. → DE1 series (IEC60384-14, X1/Y1 class)
Note that since the older products will soon be discontinued, it is recommended that you consider using the new small size Type KX capacitors instead.