Array of Darlington Transistors Inside the ULN2003

ZeptoBars posted this gorgeous teardown (break apart?) piece exploring the contents of the ULN2003 seven channel Darlington driver chip. Beautiful object AND informative post!

We often receive comments that while our 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. Despite it's simplicity this microchip is still widely used and mass manufactured. ULN2003 contains 21 resistors, 14 BJT transistors and 7 diodes. It is used to control relatively high load (up to 50V/0.5A) from microcontroller pin. Canonical use case - controlling segments of large 7-segment LED displays.

Read more. via EvilMadScientist

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Matt Griffin
Matt Griffin

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