2SB1229-U Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -50 V
• Collector-Base Voltage, max: -60 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -2 A
• Collector Dissipation: 0.75 W
• DC Current Gain (h_fe): 280 to 560
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SB1229-U is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The 2SB1229-U transistor can have a current gain of 280 to 560. The gain of the 2SB1229 will be in the range from 100 to 560, for the 2SB1229-R it will be in the range from 100 to 200, for the 2SB1229-S it will be in the range from 140 to 280, for the 2SB1229-T it will be in the range from 200 to 400.Sometimes the "2S" prefix is not marked on the package - the 2SB1229-U might only be marked "B1229-U".The complementary NPN transistor to the 2SB1229-U is the 2SD1835-U.The 2SB1115 (SOT-89), 2SB1122 (SOT-89), 2SB1122-U (SOT-89), 2SB1123 (SOT-89), 2SB1123-U (SOT-89) and 2STR2160 (SOT-23) is the SMD version of the 2SB1229-U transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1229-U with the 2SB892, 2SB892-U, 2SB985 or 2SB985U.