D400 25V 1A Low Frequency Power NPN Transistor

The 2SD400 is an NPN transistor available in TO-92LM or TO-92MOD package. This transistor is mainly designed to use in electronics low-frequency amplifiers and also in electronics governor circuits. An electronic governor is a circuit that controls the speed of a machine. Other than these uses this transistor can also be used in a variety of other general-purpose applications. The maximum collector current of the transistor is 1A due to which it can be used to drive a variety of loads in a circuit that falls under 1A when used as a switch. The max collector to emitter saturation voltage of the transistor is only 0.3V and typically only 0.1V. To drive 500mA of load the base current should be 50mA and to drive load of 1A the base current should be 100mA.

Additionally, it can also be used as a general-purpose audio amplifier, and also in RF circuits, the max transition frequency of the transistor is up to 180MHz due to which it can also be used in RF circuits under 180MHz.

Moreover, the max collector dissipation of the transistor is 900mA and the minimum and maximum DC current gain is 60 to 560 however the transistor is available in four different categories according to the DC current gain which can be determined by the first letter written below the part number. If that letter is “D” then the gain will be 60 to 120, if the letter is “E” then the gain will be 100 to 200, if it is “F” then the gain will be 160 to 320, and if “G” then the gain will be 280 to 560.

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