from the datasheet we get the pairs of values, (for active leakage we have to specify Id value):
We get the following values: IS= 1.601 e-014, ISR = 1.601 e-013, NR= 2.029, ALPHA = 0.0564 V^-1, VK=229.66 V:
Finally we look at the last chart from the datasheet that shows voltage noise as a function of frequency:
Introduce data in the last table and find KF and AF values:
It’s KF = 7.95 e-018 and AF = 0611: