2SC3621 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 150 V
• Collector-Base Voltage, max: 150 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1.5 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 60 to 200
• Transition Frequency, min: 100 MHz
• Operating and Storage Junction Temperature Range: -55 to +150 °C
• Package: TO-126

Here is an image showing the pin diagram of this transistor.The 2SC3621 transistor can have a current gain of 60 to 200. The gain of the 2SC3621-O will be in the range from 100 to 200, for the 2SC3621-R it will be in the range from 60 to 120.Sometimes the "2S" prefix is not marked on the package - the 2SC3621 might only be marked "C3621".The complementary PNP transistor to the 2SC3621 is the 2SA1408.The FMMT625 (SOT-23) is the SMD version of the 2SC3621 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC3621 with the 2SC2481 or 2SD669A.