Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KSC3502-F transistor can have a current gain of 160 to 320. The gain of the KSC3502 will be in the range from 40 to 320, for the KSC3502-C it will be in the range from 40 to 80, for the KSC3502-D it will be in the range from 60 to 120, for the KSC3502-E it will be in the range from 100 to 200.
SMD Version of KSC3502-F transistor
The BF622 (SOT-89) and BF822 (SOT-23) is the SMD version of the KSC3502-F transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for KSC3502-F transistor