Kwazar K140UD1B - Soviet / Ukrainian opamp : weekend die-shot

Kwazar K140UD1B was the first high-volume/most popular Soviet opamp without frequency correction. This sample was manufactured by Kwazar fab (Kyiv, Ukraine) in 1970's. One can compare it to its successor K140UD2 which had much higher open-loop gain.

Die size 1225x1228 µm.