Over at ZeptoBars, they have an incredibly detailed “take-apart” post on what’s inside the ULN2003 seven channel Darlington driver chip. The ULN2003 is commonly used for driving LED displays—you can find it, for example, in our Mignonette game.
We often receive comments that while out microchip photos are beautiful and interesting, it is completely unclear how integrated circuit implements basic elements and form larger circuit. Of course it is impossible to do a detailed review of an 1’000’000 transistor chip, so we’ve found simpler example: ULN2003 – array of Darlington transistors.
They’ve stripped off the outer housing and put it under the microscope. They then analyzed the photos to show you what parts make up the individual transistors, resistors and diodes inside the chip.