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I have a laser diode and its shared electrical data is limited comparing to other diode datasheets. It has a V-I curve below(dashed red one):

enter image description here

And three other parameters:

enter image description here

(Reverse saturation current is not given)

I couldnt find any calculator/tool/site that estimates Rs, N and Is from given I-V points.

cm64
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  • Good answer here that might help: https://electronics.stackexchange.com/questions/9510/how-do-i-model-an-led-with-spice/9543#9543 – Ste Kulov Jun 16 '23 at 21:24

1 Answers1

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Rs: is the slope in the high current region.

Is: for a LED assume something small like 1e-15.

Then tune N until you are happy with the agreement.

tobalt
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  • Isnt Rs ohmic resistance and it is constant? When you say slope, it reminds me dynamic resistance which is not constant. – cm64 Jun 17 '23 at 11:18
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    @cm64 look how the IV curve assumes a constant slope (equal to Rs) up in the high current region. That is because the dynamic resistance of the junction becomes too low to matter..So the net resistance reduces to the ohmic resistance of the diode. – tobalt Jun 17 '23 at 18:30