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How to choice hFE of ballast transistor?

Question asked by Aaron Lee on Oct 9, 2018
Latest reply on Oct 11, 2018 by Daniel Martynek

Hi,

 

We are using S912ZVCA for my project.

BCP53-10 hfe=63~160

BCP53-16 hfe=100~250

BTP2907SL3 hfe=180~390

Can we have the BTP2907SL3 instead of the BCP53 for ballast transistor?

You must avoid using a darlington transistor or transistors with high hFE.

What is the normal renge of the hFE?

 

Best Regards,

Aaron

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