2SB1221 Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -200 V
• Collector-Base Voltage, max: -250 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.07 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 60 to 220
• Transition Frequency, min: 80 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SB1221 transistor can have a current gain of 60 to 220. The gain of the 2SB1221-Q will be in the range from 60 to 150, for the 2SB1221-R it will be in the range from 100 to 220.Sometimes the "2S" prefix is not marked on the package - the 2SB1221 might only be marked "B1221".The complementary NPN transistor to the 2SB1221 is the 2SC3941.The BF623 (SOT-89) and BF823 (SOT-23) is the SMD version of the 2SB1221 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1221 with the 2SA1018, 2SA1370, 2SA1371, 2SA1624, 2SA1767, 2SA879 or KTA1279.