Operating and Storage Junction Temperature Range: -55 to +150 °C
Package: TO-251
Pinout of 2SB1201
Here is an image showing the pin diagram of this transistor.
Classification of hFE
The 2SB1201 transistor can have a current gain of 100 to 560. The gain of the 2SB1201-R will be in the range from 100 to 200, for the 2SB1201-S it will be in the range from 140 to 280, for the 2SB1201-T it will be in the range from 200 to 400, for the 2SB1201-U it will be in the range from 280 to 560.
Marking
Sometimes the "2S" prefix is not marked on the package - the 2SB1201 might only be marked "B1201".
Complementary NPN transistor
The complementary NPN transistor to the 2SB1201 is the 2SD1801.
SMD Version of 2SB1201 transistor
The 2SB1122 (SOT-89) and 2SB1123 (SOT-89) is the SMD version of the 2SB1201 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.