2SD1684-T Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 100 V
• Collector-Base Voltage, max: 120 V
• Emitter-Base Voltage, max: 6 V
• Collector Current − Continuous, max: 1.5 A
• Collector Dissipation: 10 W
• DC Current Gain (h_fe): 200 to 400
• Transition Frequency, min: 120 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 2SD1684-T transistor can have a current gain of 200 to 400. The gain of the 2SD1684 will be in the range from 100 to 400, for the 2SD1684-Q it will be in the range from 100 to 200, for the 2SD1684-S it will be in the range from 140 to 280.Sometimes the "2S" prefix is not marked on the package - the 2SD1684-T might only be marked "D1684-T".The complementary PNP transistor to the 2SD1684-T is the 2SB1144-T.The FMMT624 (SOT-23) and FZT694B (SOT-223) is the SMD version of the 2SD1684-T transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD1684-T with the 2SC3117, 2SC3117-T, 2SC3902, 2SC3902-T, 2SD1724, 2SD1724-R, 2SD1725, 2SD1725-R or MJE244.