Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KTB778 transistor can have a current gain of 55 to 160. The gain of the KTB778-O will be in the range from 80 to 160, for the KTB778-R it will be in the range from 55 to 110.
Complementary NPN transistor
The complementary NPN transistor to the KTB778 is the KTD998.