Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-3P
Pinout of 2SA1939
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SA1939 transistor can have a current gain of 55 to 160. The gain of the 2SA1939O will be in the range from 80 to 160, for the 2SA1939R it will be in the range from 55 to 100.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SA1939 might only be marked "A1939".
Complementary NPN transistor
The complementary NPN transistor to the 2SA1939 is the 2SC5196.
SMD Version of 2SA1939 transistor
The BDP952 (SOT-223) is the SMD version of the 2SA1939 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.