2SC3421-Y Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 120 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 120 to 240
• Transition Frequency, min: 120 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126F

Here is an image showing the pin diagram of this transistor.The 2SC3421-Y transistor can have a current gain of 120 to 240. The gain of the 2SC3421 will be in the range from 80 to 240, for the 2SC3421-O it will be in the range from 80 to 160.Sometimes the "2S" prefix is not marked on the package - the 2SC3421-Y might only be marked "C3421-Y".The complementary PNP transistor to the 2SC3421-Y is the 2SA1358-Y.The 2SC2881 (SOT-89), 2SC2881-Y (SOT-89), FMMT624 (SOT-23), FMMT625 (SOT-23), KTC4373 (SOT-89) and KTC4373Y (SOT-89) is the SMD version of the 2SC3421-Y transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC3421-Y with the 2SC1565, 2SC1565A, 2SC2481, 2SC2690, 2SC2690A, 2SC2824, 2SC2824-Y, 2SC3117, 2SC3902, 2SD600K, 2SD669, KSC2690, KSC2690A, KTC2800, KTC2800-Y or KTC2803.