SS8550D 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: -1.5 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 160 to 300
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -65 to +150 °C
• Package: TO-92

The SS8550D 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 SS8550D transistor can have a current gain of 160 to 300. The gain of the SS8550 will be in the range from 85 to 300, for the SS8550B it will be in the range from 85 to 160, for the SS8550C it will be in the range from 120 to 200.The complementary NPN transistor to the SS8550D is the SS8050D.The MMBT3702 (SOT-23), MPS8550S (SOT-23) and MPS8550S-D (SOT-23) is the SMD version of the SS8550D transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the SS8550D with the MPS750, MPS750G, MPS8550, MPS8550D or ZTX949.