I found a big bag of old 7-SEG display, turns out these are FND-503 type, common anode (originally manufactured by Fairchild I think).
Anyway I was playing with some of these (they are surplus I bought many years ago and promptly forgot about) and found that at 1.6V they begin to faintly glow with around 16mA flowing, then at 1.7V they go brighter and consume 48mA, but then as I increase the voltage further the current is rock steady at 48mA and the brightness shows no perceptible change.
A forward biased diode would be expected to obey ohms law-ish once its started to conduct, so what gives?
(Also no datasheet can be found, I was able to deduce connections from experiments and there are datasheets for FND-500 etc which are likely close)
Anyway I was playing with some of these (they are surplus I bought many years ago and promptly forgot about) and found that at 1.6V they begin to faintly glow with around 16mA flowing, then at 1.7V they go brighter and consume 48mA, but then as I increase the voltage further the current is rock steady at 48mA and the brightness shows no perceptible change.
A forward biased diode would be expected to obey ohms law-ish once its started to conduct, so what gives?
(Also no datasheet can be found, I was able to deduce connections from experiments and there are datasheets for FND-500 etc which are likely close)