hi guys , i have this transistor bd139 which i will be using for my project
http://pdf.datasheetarchive.com/indexerfiles/Datasheet-01/DSA00650.pdf
my requirement is to supply collector current of 0.15 amp. however i am unable to calculate the base current as the transistor shows gain minimum: 40 and maximum: 250 for 0.15 amp collector current. so what should be my maximum base current be.
Note- i want my transistor to fully supply 0.15 amp at my maximum base current .