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An open collector is a common type of output found on many integrated circuits (IC).Instead of outputting a signal of a specific voltage or current, the output signal is applied to the base of an internal NPN transistor whose collector is externalized (open) on a pin of the IC. The emitter of the transistor is connected internally to the ground pin. If the output device is a MOSFET the output is called open drain and it functions in a similar way.

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Wired-or open drain with open collector outputs

There really isn't an issue with that. Open drain and open-collector are essentially the same in this application. Two things to watch out for: Make sure you get your polarities right and that you …
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