Breaktru Forum

eCigarette Forum => Modding => Simplified Electronics => Topic started by: Zanderist on May 05, 2015, 10:02:45 PM

Title: Basic Transistor Calculation question.
Post by: Zanderist on May 05, 2015, 10:02:45 PM

I feel like I could answer this on my own but I want to be certain and have it documented

Take for example this transistor here:
http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/KSA733GBU/?qs=ljbEvF4DwOOl8qY6LNxwbA%3D%3D
Datasheet
http://www.mouser.com/ds/2/149/KSA733-66883.pdf

It states that the DC current gain is around 40 and can max around 700. However what confuses me is that current gain of 40 is only true for a certain condition how would I go about finding the current gain for different conditions?

Title: Re: Basic Transistor Calculation question.
Post by: CraigHB on May 06, 2015, 02:39:08 PM

That's a production tolerance.  You'd have to build a circuit and measure it on the bench to find actual gain.  If you look at the chart below you'll see the mean is about 100 depending to an extent on collector-emitter current.  That would be typical.  Why they didn't just put that in the "typical" column I don't know.