I have a bunch (11) of these 8 pin DIP optos, clearly marked ILD855, date code 9426H, also marked with the modern UL symbol. I believe they are Siemens brand marked, with the elongated "S" overstruck with an "H" in the middle. They were pulls from some kind of junked boards sometime back.
I have searched far and wide many variations of this ID, including Siemens brand and anything else I could think of, with no luck - it seems to have disappeared from the earth. Does anyone recognize this part type, or maybe a clue to some variation or subset or equivalent that makes sense?
Ed
