Products with part numbers beginning with DE2 are general-purpose X1/Y2 class safety standard certified lead type ceramic capacitors. There are two types: Type KH and Type KY.
Compared with Type KH, the new Type KY products are more compact and also utilize halogen-free resin for the package and CP wires.
The new Type KY product lineup includes voltage ratings of AC250V (r.m.s.) and AC300V (r.m.s.).
For details, refer to webpage. → DE2 series (IEC60384-14, X1/Y2 class)
Note that since the older products will soon be discontinued, it is recommended that you consider using the new Type KY capacitors instead.