# where to find the R_ESR of diode in Datasheet?

#### TarikElec

Joined Oct 17, 2019
35
I have been searching how can I read some important inofrmation for my PLECS model regarding this diode but could not find it.
I looked on google and I find some youtuve video on how to read a datasheet of diode but did not mention the resistance.

#### dl324

Joined Mar 30, 2015
12,226
You can get it from the slop of an IV curve. Why do you care? If you operate the zener at or above $$I_{ZT}$$, you know the maximum resistance.

#### TarikElec

Joined Oct 17, 2019
35

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#### jpanhalt

Joined Jan 18, 2008
10,933
Perhaps you meant this graph:

Look at the DC line. It is not straight, but let's call power dissipation at 2 A = 2.5 W. Thus I^2R = 2.5 W. R = 2.5 W/(2 A)^2 = 2.5/4 Ω.

#### dl324

Joined Mar 30, 2015
12,226
Sorry but I am bit confused here, I am having this Electrical characteristics
What is the application where you'd care what the resistance is?

You can get typical values from the IV curve in the datasheet (deltaV/deltaI):

If a typical value isn't good enough, you'd have to characterize each diode individually.