2SD1684-Q 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): 100 to 200
• 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-Q transistor can have a current gain of 100 to 200. The gain of the 2SD1684 will be in the range from 100 to 400, for the 2SD1684-S it will be in the range from 140 to 280, for the 2SD1684-T it will be in the range from 200 to 400.Sometimes the "2S" prefix is not marked on the package - the 2SD1684-Q might only be marked "D1684-Q".The complementary PNP transistor to the 2SD1684-Q is the 2SB1144-Q.The 2SC2881 (SOT-89), FMMT624 (SOT-23) and KTC4373 (SOT-89) is the SMD version of the 2SD1684-Q transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the 2SD1684-Q with the 2SC2481, 2SC2481-O, 2SC3117, 2SC3117-R, 2SC3621, 2SC3621-O, 2SC3902, 2SC3902-R, 2SD1724, 2SD1724-R, 2SD1725, 2SD1725-R, 2SD669, 2SD669-C, 2SD669A, 2SD669A-C, BD791, KTC2800 or MJE244.