2SC2120 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 30 V
• Collector-Base Voltage, max: 35 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.8 A
• Collector Dissipation: 0.6 W
• DC Current Gain (h_fe): 100 to 320
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92

The 2SC2120 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, collector, and base leads.
Here is an image showing the pin diagram of this transistor.The 2SC2120 transistor can have a current gain of 100 to 320. The gain of the 2SC2120-O will be in the range from 100 to 200, for the 2SC2120-Y it will be in the range from 160 to 320.Sometimes the "2S" prefix is not marked on the package - the 2SC2120 might only be marked "C2120".The complementary PNP transistor to the 2SC2120 is the 2SA950.The 2SC2859 (SOT-23), 2SC2883 (SOT-89), 2SC4118 (SOT-323), 2SC4210 (SOT-23), KTC3265 (SOT-23), KTC3876 (SOT-23), KTC3876S (SOT-23), KTC4376 (SOT-89) and KTC8050S (SOT-23) is the SMD version of the 2SC2120 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC2120 with the 2SC1384, 2SC2236, 2SC2328A, 2SC2710, 2SC3203, 2SC3205, 2SC3940A, 2SD1207, 2SD1347, 2SD1835, 2SD789, 2SD863, KSC2328A, KTC1008, KTC3203, KTC3204, KTC3205, KTC3210 or KTD863.