The KTA1266GR 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 KTA1266GR transistor can have a current gain of 200 to 400. The gain of the KTA1266 will be in the range from 70 to 400, for the KTA1266O it will be in the range from 70 to 140, for the KTA1266Y it will be in the range from 120 to 240.
Complementary NPN transistor
The complementary NPN transistor to the KTA1266GR is the KTC3198GR.