BD679 Pinout, Equivalent, Applications, Specs and Other Info

BD679 is a darlington transistor available in TO-126 package. In this post you will find BD679 pinout, equivalent, applications, specs and other important information about this transistor.


BD679 Pinout, Equivalent, Applications, Specs and Other Info



Features / Technical specifications:

  • Package Type: TO-126
  • Transistor Type: NPN
  • Max Collector Current(IC): 4A
  • Max Peak Collector Current: 6A
  • Max Collector-Emitter Voltage (VCE): 80V
  • Max Collector-Base Voltage (VCB): 80V
  • Max Emitter-Base Voltage (VEBO): 5V
  • Max Collector Dissipation (Pc): 40 Watt
  • Minimum & Maximum DC Current Gain (hFE): 1000
  • Max Storage & Operating temperature: -65 to +150 Centigrade


PNP Complementary:

PNP Complementary of BD679 is BD680


Replacement and Equivalent:

2SD1210, 2SD1514, 2N6039, 2SC2825, 2SD1457, 2SD1515. Pin configuration of these equivalent transistors may different from BD679, therefore always check pin configuration before replacing in the circuit.


BD679 Transistor Explained / Description:

BD679 is a NPN darlington transistor available in TO-126 package. A darlington transistor consists two BJT transistors in a single package which are connected together in a way which results in very high output gain. The max gain or Hfe of the transistor is 1000 which makes this transistor ideal for high gain applications. The max collector current is 4A and the max peak collector current is 6A. The collector-emitter voltage or max load voltage of the transistor is 80V and the max collector dissipation of the transistor is 40Watt. BD679 can be used for wide variety of general applications of switching and amplification which will be further explained in next topics.


Where We Can Use it & How to Use:

BD679 can be used for any general purpose switching and amplification purposes. With max collector current of 4A it is capable to drive many loads such as motors, other transistors, relays and part of circuits. Moreover it can also be used at the output of electronic platforms such as arduino, raspberry pi etc. Other than that it can also be used to increase gain of many type of signals such as audio and other electronics signals.



BMS Circuits

Motor Driver Circuits

Battery Charger Circuits

Audio Amplifier Circuits

Audio Preamplifiers and Its Stages

Driving or Switching Loads under 4A


How to Safely Long Run in a Circuit:

For long term performance of a component it is suggested to not use a component to its maximum ratings and always use it 20% below from its max ratings. The max collector current is 4A therefore do not drive load of more than 3.2A. The max collector-emitter voltage is 80V therefore do not drive load of more than 64V.

Use a suitable heatsink with the transistor and always store or operate the transistor in temperature above -55 degree centigrade and below +150 degree centigrade.



To Download the datasheet just copy and paste the below link in your browser.

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