Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KSD794-O transistor can have a current gain of 100 to 200. The gain of the KSD794 will be in the range from 60 to 320, for the KSD794-R it will be in the range from 60 to 120, for the KSD794-Y it will be in the range from 160 to 320.
Complementary PNP transistor
The complementary PNP transistor to the KSD794-O is the KSB744-O.
Replacement and Equivalent for KSD794-O transistor