MJE340 transistor

MJE340 transistor
MJE340 transistor

MJE340 transistor electrical specification

  • MJE340 is a silicon planer NPN transistor device
  • Collector to emitter voltage is 300V
  • Collector to base voltage is 300V
  • Emitter to base voltage is 3V
  • Collector current is 5A
  • Power dissipation is 8W
  • DC current gain is 30 to 240hFE
  • Junction temperature is between -65 to +150℃
  • Collector to emitter saturation voltage (VCE (SAT)) is5V
  • Thermal resistance is 6℃/W
  • High voltage general purpose transistor
  • Medium power device
  • Suitable for transformer-less
  • Line operated equipment
  • Thermo-pad construction provides a high power dissipation rating for high reliability

MJE340 transistor Pinout

MJE340 transistor Pinout
MJE340 transistor Pinout
Pin Number Pin Name Description
1 Emitter  Current flows through the emitter
2 Collector Current flows through the collector
3 Base It is used to trigger the transistor device


MJE340 transistor package

The MJE340 transistor has a TO-225 package, it is a transistor package mainly used for POWER applications.

The TO-225 package is made of epoxy/plastic material which is good for heat resistance properties then it is more compact and less weight.

The TO-225 packages are been mainly used for medium power application devices, so this is the reason for the provision of a through-hole for heat sink attachment.

MJE340 transistor electrical specification description

In this section, we try to explain the electrical specifications of the MJE340 transistor device, which is very useful for a better understanding of this device.

Voltage specs

The voltage specs of MJE340 transistor are collector to emitter voltage is 300V, collector to base voltage is 300V and emitter to base voltage is 3V, the terminal voltage shows it is medium power device.

The collector to emitter saturation voltage is 0.5V, the saturation voltage shows the region switching voltage.

Overall voltage specifications of the MJE340 transistor show that it is a medium power device mainly used for power supply and power switching applications.

Current specs

The collector current value of the MJE340 transistor is 0.5A, the current value shows the load capacity of this transistor is under 0.5amps.

The current specifications of the MJE340 transistor indicate that it is more capable of driver applications.

Dissipation specs

The power dissipation of the MJE340 transistor is 20.8W, the dissipation value mainly depends on the transistor package.

DC current gain specs

The DC current gain value of the MJE340 transistor is 30 to 240hFE, this transistor is a low-power amplifier application.

Junction temperature

 The junction temperature of -65 to 150℃, and the MJE340 is a medium-power transistor device.

Thermal resistance

The thermal resistance of the MJE340 transistor device case is 6℃/W

MJE340 transistor DATASHEET

If you need the datasheet in pdf please click this link

MJE340 transistor equivalent

The MJE340 had equivalent transistors such as 2N5656, BD128, BD158, BD410, 2N6175, 2N6557, BD127, NSD132, 2SC2068 and 2SD668.

Each of these transistor devices had almost the same electrical specifications, so we can use them as the replacement for the circuits.

MJE340 complementary transistor

The MJE340 NPN transistor had a complimentary pair PNP transistor MJE350, both these transistors had the same and opposite electrical specifications, so we can use them as the Darlington pair or push-pull pair at the circuits.

MJE340 vs BD139 vs TIP41

In the table below, we list the electrical specifications of MJE340, BD139, and TIP41 transistors for a comparison of the device.

Collector to base voltage (VCB)    300V80V40V
Collector to emitter voltage (VCE)300V80V40V
Emitter to base voltage (VEB)3V5V5V
Collector to emitter saturation voltage (VCE (SAT))0.5V0.5V1.5V
Collector current (IC)0.5A1.5A6A
Power dissipation20.8W12.5W65W
Junction temperature (TJ)-65 to +150°C-65 to +150°C-65 to +150°C
Thermal resistance6℃/W100℃/W57℃/W
Transition frequency (FT)--3MHz
Gain (hFE)30 to 240hFE25 to 250hFE15 to 75hFE

MJE340 transistor applications

  • Linear and switching industrial equipment
  • Linear power supplies
  • Inverter circuits
  • UPS circuits
  • Battery charger circuits
  • Motor controller circuits
  • DC high voltage switching

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