October 26, 2015

CHANGJIANG MMBT2222A - npn BJT transistor : weekend die-shot

Unlike OnSemi MMBT2222A CHANGJIANG MMBT2222A has both smaller die size and simpler layout (BC847-like) - which should cause significantly lower hFE on high collector currents.

Die size 234x234 µm.


October 19, 2015

Linear LT1021-5 ±0.05% precision reference : weekend die-shot

Expected heavy duty digital correction? Nope. Just 15 fuses and buried Zener - truly a work of art.
Die size 2354x1364 µm.


October 19, 2015
October 11, 2015

ST UA741 - the opamp : weekend die-shot

µA741 was the first "usable", widespread solid state opamp, mainly due to integrated capacitor for frequency correction (which we now take for granted in general-purpose opamps). This chip was reimplemented numerous times since 1968, like this ST UA741 in 2001. You can also take a look at historic schematic of µA741 here.

Die size 1073x993 µm.


September 26, 2015

Diodes BC847BS - matched BJT pair : weekend die-shot

Diodes Incorporated BC847BS - pair of npn transistors with matched hFE. Internally it has 2 separate dies.
Die size 306x306 µm.



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September 24, 2015

TL431 - adjustable shunt regulator : weekend die-shot

TL431 is another adjustable shunt regulator often used in linear supplies with external power transistor.
Die size 592x549 µm.


August 18, 2015