The KTC3198BL is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads. Here is an image showing the pin diagram of this transistor.
Classification of hFE
The KTC3198BL transistor can have a current gain of 300 to 700. The gain of the KTC3198 will be in the range from 70 to 700, for the KTC3198GR it will be in the range from 200 to 400, for the KTC3198O it will be in the range from 70 to 140, for the KTC3198Y it will be in the range from 120 to 240.
SMD Version of KTC3198BL transistor
The 2SC2712 (SOT-23), 2SC4116 (SOT-323), 2SC4738 (SOT-23), FJX945 (SOT-323), KTC3875 (SOT-23), KTC3875S (SOT-23) and PMBT6428 (SOT-23) is the SMD version of the KTC3198BL transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
KTC3198BL Transistor in TO-92 Package
The 2SC3198-BL is the TO-92 version of the KTC3198BL.
Replacement and Equivalent for KTC3198BL transistor