2SD400 transistor

2SD400 transistor
2SD400 transistor

2SD400 transistor electrical specification

  • 2SD400 is an NPN silicon transistor device
  • Collector to emitter voltage is 25V
  • Collector to base voltage is 25V
  • Emitter to base voltage is 5V
  • Collector current is 1A
  • Power dissipation is 9W
  • DC current gain is 60 to 560hFE
  • Gain Bandwidth transition frequency (FT) is 180MHz
  • Junction temperature & operating temperature is between -55 to +150
  • Collector to emitter saturation voltage (VCE (SAT)) is3V
  • Output capacitance is 15pF
  • Low-frequency power amplifier device

2SD400 Pinout

2SD400 Pinout
2SD400 Pinout
Pin Number Pin Name Description
1 Emitter Current flows through the emitter terminal
2 Collector Current flows through the collector
3 Base Base terminal is the trigger for the transistor


2SD400 transistor package

The D400 is a low-frequency transistor device had a TO-92 package, it is a three-terminal device which is made of epoxy/plastic material, which will provide higher temperature capacity and compactness as an electronic component.

D400 electrical specification & application description

In this section we try to explain the electrical specifications of the 2SD400 transistor, this explanation is useful for a better understanding of this device.

Voltage specs

The terminal voltage specs of the 2SD400 transistor are collector to emitter voltage is 25V, collector to base voltage is 25V, and emitter to base voltage is 5V, these voltage specifications of the device show it is a low voltage device.

The collector-to-emitter saturation voltage is 0.3V, this voltage specs show the switching value.

Current specs

The collector current value of the 2SD400 transistor is 1A, the current value indicates the load capacity of the device.

Dissipation specs

The power dissipation value of the 2SD400 transistor is 0.9W, the dissipation ability is mainly dependent on the device package.

Current gain specs

The DC current gain value of the 2SD400 transistor is 60 to 560Hfe, the gain value is mainly applicable for amplifier applications.

Transition frequency specs

The transition frequency of the D400 transistor is 180MHz, it is the maximum frequency value of the circuit.

Junction temperature/ storage temperature 

The junction temperature or storage temperature is -50 to 150℃, it is the maximum heat capacity of the device.

Output capacitance

The output capacitance value of the 2SD400 transistor is 15Pf.

2SD400 transistor DATASHEET

If you need the datasheet in pdf please click this link

2SD400 transistor equivalent

The transistors such as BD201, BD239, BD301, 2SD2206, 2SC3207, 2SC4781, 2SD2213, 2SD1984 and 2SD2206A, these are the equivalent devices of 2SD400 transistor.

The electrical specifications of these transistors are equivalent to the device and we can easily replace them at circuits.

2SD400 transistor complementary  

The 2SD400 NPN transistor has a 2SB544 PNP complementary transistor device, and each of them has the same set of electrical specifications.

2SD400 vs BD201 vs 2SD2206

In the table below, we listed the electrical specifications of 2SD400, BD201, and 2SD2206 transistors, this comparison is really useful for a better understanding.

Collector to base voltage (VCB)25V60V100V
Collector to emitter voltage (VCE)25V45V100V
Emitter to base voltage (VEB)5V5V8V
Collector to emitter saturation voltage (VCE (SAT))0.3V1V to 1.5v1.5V
Collector current (IC)1A8A2A
Power dissipation0.9W60W900mW
Junction temperature & operating temperature (TJ)-55 to 150°C-65 to +150°C-55 to +150°C
Transition frequency (FT)180MHZ7MHz100MHz
Gain (hFE)60 to 560hFE30hFE2000hFE
Output capacitance15pF-20Pf
Thermal resistance -2.08℃/W-

Applications of D400 transistor

  • The low-frequency amplifier circuit
  • Speed control circuit
  • Radiofrequency amplifier circuit

Graphical representation of 2SD400 transistor 

output characteristics of the 2SD400 transistor
output characteristics of the 2SD400 transistor

The figure shows the output characteristics of the 2SD400 transistor plots with collector current vs collector to emitter voltage.

At each base current value, the collector current increases with respect to the collector-to-emitter voltage.

At higher base current values, the collector current is at its highest.

characteristic curve of the 2SD400 transistor
characteristic curve of the 2SD400 transistor

The figure shows the characteristic curve of the 2SD400 transistor, the graph plots with DC current gain vs collector current.

At a constant voltage value and different temperature values, the gain value increases and becomes constant.

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