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