Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-220
Pinout of 2SD866
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SD866 transistor can have a current gain of 60 to 260. The gain of the 2SD866-P will be in the range from 130 to 260, for the 2SD866-Q it will be in the range from 90 to 180, for the 2SD866-R it will be in the range from 60 to 120.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SD866 might only be marked "D866".
Complementary PNP transistor
The complementary PNP transistor to the 2SD866 is the 2SB870.