January 31, 2020

140UD9 - general purpose Soviet opamp (1989) : weekend die-shot

Like some of the K140UD2B this one has polymer overcoat, which causes interference pattern across the area due to thickness non-uniformity. 140UD9 is similar to CA3047 with differences in the final amplification stage.
Die size 1780x1780 ┬Ám.