I have understood the theoretical portion of the transistor. Now, I am trying to select a part and figure the actual current calculations in my circuit.

I have 30mA of collector (load current). This is the transistor I am choosing for my design : https://www.onsemi.com/pub/Collateral/MMBTA05LT1-D.PDF

MMBTA06

So, Once I have figured out the collector current through my transistor, I need to calculate my required base current.

But while calculating the required base current, how will I choose the Hfe value? In the datasheet it is given as 100 (For Ic=100mA and Vce=1.0V)

But my actual Ic is just 30mA. How will I fix my gain now?

Please help.

Thanks.

P.S. It would be better if you give me some direction of steps/approach once I complete this gain calculation.