LM293: How to explain the LM293B IOH High-level output current 1uA?While the LM293 Open-Drain output~

Hello Cheney_Sun,

This is a "leakage current" that can occur at higher temperatures.

While you tend to think of the output device as a discrete transistor, it is actually one of many devices on a die - so there are some leakages within the die to V+.

These leakages are always there, even when the output is "low", which normally swamps out the leakage. But this leakage can cause issues if you use unusually high value pull-up resistor values (>1M) at high temperatures, and could cause the output high voltage to vary from the expected pull-up voltage.

In the majority of applications, you will never notice this current.