Help reading datasheet

[onpiopah]

Hi,

i am a neewbie and need to be put on the right direction. I am trying to learn how to read a tansistor datasheet for a Darlington 2SB1647. I have read many guides on the internet but they all tend to advise on diffrent types of datasheet and the one I am reading does not make it clear.

I am ok with the max ratings i can follow that - however i am a bit confused as all the ratings are minus i.e. it sates

Vcbo -150
Vceo -150
Vebo -5

why does it say minus?


next on the electrical characteristics i would simply like to know the min and max to put across the base and what multiplyer the emitter to collector would be, the info given is as follows.


Symbol Conditions Ratings Unit
Icbo Vcb = -150 -100max uA
Iebo Veb= -5 -100max uA
V(br) ceo Ic=-30mA -150 min V
hfe Vce=-4, Ic =-10 5000min
Vce(sat) Ic=-10A, Ib=-10mA -2.5max V
Vbe(sat) Ic= -10A, Ib =-10mA -3.0max V
fr Vce=-12V, Ie =2A 45typ MHz
Cob Vcb =-10V , f=1MHZ 320typ pF

I know it is a big ask but if anyone would take the time to explain the above to me i would be very grateful i want to be able to learn this for myself for the future.