Hello,
The question is pure theoretical.
A transistor will never be saturated with the given base current of 4.5 mA.
In practice we use Ib =Ic/10 for saturation of a switching transistor.
In your example the transistor should have a gain of 3.6 / 0.0045 = 800 times.
Can you show your calculation of the base transistor in your case?
Can you show the complete page of the task?
Bertus
The question is pure theoretical.
A transistor will never be saturated with the given base current of 4.5 mA.
In practice we use Ib =Ic/10 for saturation of a switching transistor.
In your example the transistor should have a gain of 3.6 / 0.0045 = 800 times.
Can you show your calculation of the base transistor in your case?
Can you show the complete page of the task?
Bertus
It is also badly worded. The phrase "its input voltage" is ambiguous and no terminal of the transistor receives 11V.
A representative look at transistor saturation :
The "classic" rule of thumb to sat a transistor is to force Icollect/10 or more into the base.
This is called forced beta in the industry jargon. But its a rule best used by examining the
datasheet for sat behavior. You can see here if Ic = 1A in active region it takes ~ 20 mA
to get transistor into saturation, not the 100 mA the rule would imply.
Attached a good discussion on saturation.
Regards, Dana.
The "classic" rule of thumb to sat a transistor is to force Icollect/10 or more into the base.
This is called forced beta in the industry jargon. But its a rule best used by examining the
datasheet for sat behavior. You can see here if Ic = 1A in active region it takes ~ 20 mA
to get transistor into saturation, not the 100 mA the rule would imply.
Attached a good discussion on saturation.
Regards, Dana.
Last edited:
