2SC3939 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 80 V
• Collector-Base Voltage, max: 80 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 0.5 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 130 to 330
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-92MOD

Here is an image showing the pin diagram of this transistor.The 2SC3939 transistor can have a current gain of 130 to 330. The gain of the 2SC3939-R will be in the range from 130 to 220, for the 2SC3939-S it will be in the range from 185 to 330.Sometimes the "2S" prefix is not marked on the package - the 2SC3939 might only be marked "C3939".The complementary PNP transistor to the 2SC3939 is the 2SA1533.The 2SC3438 (SOT-89), FMMTA06 (SOT-23), KST06 (SOT-23), MMBTA06 (SOT-23), PMBTA06 (SOT-23), PZTA06 (SOT-223) and SMBTA06 (SOT-23) is the SMD version of the 2SC3939 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC3939 with the 2SC1509, 2SC3332, 2SC3708, 2SD1211, 2SD438, KSC1009C or KTC1006.