Comments (1)
So in the 3rd one, the LED is forward biased, and the diode is reversed?
It seems right. The saturation current of the diode (roughly, its reverse-bias current) is 18nA. With the LED model I'm using, it has 512mV of voltage across it when passing 18nA of current. So the diode has to make up the difference.
I wouldn't expect the diode to be at exactly 5 V. Then the LED would have 0V across it, and there wouldn't be any current at all.
The diode LED model could be a bit simplified, or may not match the LED you're using, but you can replace it with another one that matches your device.
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