Suppose I have this
BC635 transistor, if I look at
hFE then I'd say that the lowest value is 25 from that table in the
Electrical Characteristics category, but if I look at the
Figure 3. Base-Emitter Saturation Voltage from where I get the
beta characteristic, on the right side of the plot
beta is 10.
Now I only learned about the
beta characteristic in school, not about
hFE, but I read online that they are the same thing, although this is not true judging from the datasheet I linked.
The question is:
What should I use in my calculations for the base current if I want to use a transistor as a simple DC switch,
beta from the plot or
What's more troubling is that some datasheets do not have those plots, what should I do there?