The KTC3199BL 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 KTC3199BL transistor can have a current gain of 300 to 700. The gain of the KTC3199 will be in the range from 70 to 700, for the KTC3199GR it will be in the range from 200 to 400, for the KTC3199O it will be in the range from 70 to 140, for the KTC3199Y it will be in the range from 120 to 240.
SMD Version of KTC3199BL 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 KTC3199BL transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.
Replacement and Equivalent for KTC3199BL transistor