2SB559-F Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -18 V
• Collector-Base Voltage, max: -20 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -1.2 A
• Collector Dissipation: 8 W
• DC Current Gain (h_fe): 160 to 320
• Transition Frequency, min: 150 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 2SB559-F transistor can have a current gain of 160 to 320. The gain of the 2SB559 will be in the range from 60 to 320, for the 2SB559-D it will be in the range from 60 to 120, for the 2SB559-E it will be in the range from 100 to 200.Sometimes the "2S" prefix is not marked on the package - the 2SB559-F might only be marked "B559-F".The complementary NPN transistor to the 2SB559-F is the 2SD439-F.The 2SA1365 (SOT-23), 2SA1365-E (SOT-23), BCX69 (SOT-89) and BCX69-25 (SOT-89) is the SMD version of the 2SB559-F transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SB559-F with the 2SA1120, 2SA1357, 2SA1357-Y, 2SA715, 2SA715-D, 2SA738, 2SB1009, 2SB1127, 2SB1140, 2SB1141, 2SB743, 2SB743-P, 2SB772, 2SB772P, 2SB772Y, BD186, KSB772, KSB772-Y, KSH772, KSH772-Y, KTB772, KTB772-Y or MJE370.