Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KTD2059O transistor can have a current gain of 70 to 140. The gain of the KTD2059 will be in the range from 40 to 240, for the KTD2059R it will be in the range from 40 to 80, for the KTD2059Y it will be in the range from 120 to 240.
Complementary PNP transistor
The complementary PNP transistor to the KTD2059O is the KTB1367O.
SMD Version of KTD2059O transistor
The BDP953 (SOT-223) is the SMD version of the KTD2059O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for KTD2059O transistor