Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KSB546-Y transistor can have a current gain of 120 to 240. The gain of the KSB546 will be in the range from 40 to 240, for the KSB546-O it will be in the range from 70 to 140, for the KSB546-R it will be in the range from 40 to 80.
Complementary NPN transistor
The complementary NPN transistor to the KSB546-Y is the KSD401-Y.
SMD Version of KSB546-Y transistor
The PBHV9115T (SOT-23), PBHV9115X (SOT-89), PBHV9115Z (SOT-223) and PBHV9215Z (SOT-223) is the SMD version of the KSB546-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for KSB546-Y transistor