Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-220F
Pinout of 2SD1277
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SD1277 transistor can have a current gain of 2000 to 10000. The gain of the 2SD1277-P will be in the range from 4000 to 10000, for the 2SD1277-Q it will be in the range from 2000 to 5000, for the 2SD1277A it will be in the range from 2000 to 10000, for the 2SD1277A-P it will be in the range from 4000 to 10000, for the 2SD1277A-Q it will be in the range from 2000 to 5000.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SD1277 might only be marked "D1277".
Complementary PNP transistor
The complementary PNP transistor to the 2SD1277 is the 2SB951.