S8550B Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -25 V
• Collector-Base Voltage, max: -40 V
• Emitter-Base Voltage, max: -5 V
• Collector Current − Continuous, max: -0.5 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 85 to 160
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-92

The S8550B 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, base, and collector leads.
Here is an image showing the pin diagram of this transistor.The S8550B transistor can have a current gain of 85 to 160. The gain of the S8550 will be in the range from 85 to 300, for the S8550C it will be in the range from 120 to 200, for the S8550D it will be in the range from 160 to 300.The complementary NPN transistor to the S8550B is the S8050B.You can replace the S8550B with the 2SB564A, KSB564A, KTC9012, M8550, M8550-B, MPS3702, MPS6535, MPS6562, MPS6651, MPS6651G, MPS6652, MPS6652G, MPS750, MPS750G, MPS8550, MPS8550B, MPSW51, MPSW51A, MPSW51AG, MPSW51G, S9012, SS8550 or SS8550B.