October 29, 2016
K140UD2B - Soviet opamp : weekend die-shotK140UD2B is an old Soviet opamp without internal frequency compensation. Similar to RCA CA3047T. ICs manufactured in ~1982 have bare die in metal can, ones manufactured in 1988 - have some protective overcoat inside metal can (which is quite unusual).
Die size 1621x1615 µm.