Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-3P
Pinout of 2SA1940
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SA1940 transistor can have a current gain of 55 to 160. The gain of the 2SA1940O will be in the range from 80 to 160, for the 2SA1940R it will be in the range from 55 to 100.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SA1940 might only be marked "A1940".
Complementary NPN transistor
The complementary NPN transistor to the 2SA1940 is the 2SC5197.