February 16, 2017

National LM394CH - super matched BJT : weekend die-shot

National LM394CH - has 2x50 interleaved BJT transistors in parallel in order to get 2 transistors with well-matched parameters. This is often desired in discrete op-amps. Not sure why this trick is rarely used in integrated opamps.

Die size 1449x1347 ┬Ám.

Chip is soldered to ceramic substrate holder: