# calculating input resistance of darlington pair (TIP120) from datasheet values

I've tried to find a way to calculate the input resistance of a darlington pair (TIP120), using the values given in the datasheets.

https://www.onsemi.com/pub/Collateral/TIP120-D.PDF

After Searching for a while, i was only able to find solutions for discrete darlingtons,(these required knowing parameters for each transistor (like the hfe,hie that are missing in tip120 datasheet).

I need this parameter to perform the calculations concerning the AC Analysis of this circuit (T1 is the darlington):

How do I find Hfe and Hfi for this circuit?