2SC3621-O 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): 100 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-O transistor can have a current gain of 100 to 200. The gain of the 2SC3621 will be in the range from 60 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-O might only be marked "C3621-O".The complementary PNP transistor to the 2SC3621-O is the 2SA1408-O.The FMMT625 (SOT-23) is the SMD version of the 2SC3621-O transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SC3621-O with the 2SC2481, 2SC2481-O, 2SC3117, 2SC3117-R, 2SC3902, 2SC3902-R, 2SD669A, 2SD669A-C or KTC2800.