2SC1009O Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 140 V
• Collector-Base Voltage, max: 160 V
• Emitter-Base Voltage, max: 8 V
• Collector Current − Continuous, max: 0.7 A
• Collector Dissipation: 0.8 W
• DC Current Gain (h_fe): 70 to 140
• Transition Frequency, min: 30 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SC1009O 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 2SC1009O transistor can have a current gain of 70 to 140. The gain of the 2SC1009 will be in the range from 40 to 400, for the 2SC1009G it will be in the range from 200 to 400, for the 2SC1009R it will be in the range from 40 to 80, for the 2SC1009Y it will be in the range from 120 to 240.Sometimes the "2S" prefix is not marked on the package - the 2SC1009O might only be marked "C1009O".The complementary PNP transistor to the 2SC1009O is the 2SA709O.The KST5550 (SOT-23) and MMBT5550 (SOT-23) is the SMD version of the 2SC1009O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.The KSC1009O is the TO-92 version of the 2SC1009O.You can replace the 2SC1009O with the KSC1009 or KSC1009O.