Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KSD526-O transistor can have a current gain of 70 to 140. The gain of the KSD526 will be in the range from 40 to 240, for the KSD526-R it will be in the range from 40 to 80, for the KSD526-Y it will be in the range from 120 to 240.
Complementary PNP transistor
The complementary PNP transistor to the KSD526-O is the KSB596-O.
SMD Version of KSD526-O transistor
The BDP951 (SOT-223) is the SMD version of the KSD526-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for KSD526-O transistor