Hi, I want to use TIP122 transistor. This is the datasheet http://www.adafruit.com/datasheets/TIP120.pdf
It is written that hfe is 1000 at Vce = 3 volt (test conditions). In my case, I put 12 volts on Vce. If I used resistors to make base current equal to 0.25 mA, Is this guarantee that Ic will still at 0.25 A even if the load increased or decreased ?
If not, How can I guarantee constant current on the collector ?