Motorola MC358G is not an opamp. According to scarce information we’ve found (it is so far pre-internet – no scanned datasheet, made in 1964) it’s a ECL J-K flip-flop. Die photo matches image from The National Museum of American History at Smithsonian. This chip is 57 years old, oldest among Zeptobars specimens. Motorola gets bonus points for pad in the middle of the die.
Die size 2016×1517 µm. Bond-wires feel more fragile than usual. Need to run EDS on them…
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