2SB1221-Q 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 150
• 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-Q transistor can have a current gain of 60 to 150. The gain of the 2SB1221 will be in the range from 60 to 220, 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-Q might only be marked "B1221-Q".The complementary NPN transistor to the 2SB1221-Q is the 2SC3941-Q.The BF623 (SOT-89) and BF823 (SOT-23) is the SMD version of the 2SB1221-Q transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1221-Q with the 2SA1018, 2SA1018Q, 2SA1091, 2SA1091-O, 2SA1370, 2SA1371, 2SA1624, 2SA1625, 2SA1767, 2SA1767Q, 2SA879, 2SA879-Q, KSA1625, KTA1277 or KTA1279.