M8550-D Bipolar Transistor

• Type: PNP
• Collector-Emitter Voltage, max: -25 V
• Collector-Base Voltage, max: -40 V
• Emitter-Base Voltage, max: -6 V
• Collector Current − Continuous, max: -1 A
• Collector Dissipation: 0.625 W
• DC Current Gain (h_fe): 160 to 300
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The M8550-D 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 M8550-D transistor can have a current gain of 160 to 300. The gain of the M8550 will be in the range from 80 to 300, for the M8550-B it will be in the range from 80 to 160, for the M8550-C it will be in the range from 120 to 200.The complementary NPN transistor to the M8550-D is the M8050-D.The MMBT3702 (SOT-23) is the SMD version of the M8550-D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the M8550-D with the 2SB564A, KSB564A, MPS6651, MPS6651G, MPS6652, MPS6652G, MPS750, MPS750G, MPS8550, MPS8550D, MPSW51, MPSW51A, MPSW51AG, MPSW51G, SS8550, SS8550D, ZTX549, ZTX550 or ZTX949.