2SB1142-R 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: -2.5 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 100 to 200
• Transition Frequency, min: 140 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SB1142-R transistor can have a current gain of 100 to 200. The gain of the 2SB1142 will be in the range from 100 to 400, for the 2SB1142-S it will be in the range from 140 to 280, for the 2SB1142-T it will be in the range from 200 to 400.Sometimes the "2S" prefix is not marked on the package - the 2SB1142-R might only be marked "B1142-R".The complementary NPN transistor to the 2SB1142-R is the 2SD1682-R.The 2SB1123 (SOT-89) and 2SB1123-R (SOT-89) is the SMD version of the 2SB1142-R transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB1142-R with the 2SB1143, 2SB1143-R, 2SB1165, 2SB1165-R, 2SB1166, 2SB1166-R, 2SB1167, 2SB1167-R, 2SB1168, 2SB1168-R, 2SB744A, 2SB744A-O, 2SB986, 2SB986-R, BD178, BD180, BD180G, BD190, BD788, BD788G, BD790, BD792, KSB744A, KSB744A-O, KSE171, KSE172, MJE171, MJE171G, MJE172, MJE172G, MJE233, MJE235, MJE250, MJE252 or MJE254.