BD680 Transistor Pinout, Equivalents, Features, Uses, Where and How to Use

BD680 is a Darlington transistor available in TO-126 transistor package. This post contains all the important information about BD680 transistor such as its pinout, equivalents, features, uses, where and how to use etc.


BD680 Transistor Pinout, Equivalents, Features, Uses, Where and How to Use




Absolute Maximum Ratings:

  • Package Type: TO-126
  • Transistor Type: PNP Darlington
  • Max Collector Current(IC): -4A
  • Max Collector-Emitter Voltage (VCEO): -80V
  • Max Collector-Base Voltage (VCBO): -80V
  • Max Emitter-Base Voltage (VEBO): -5V
  • Max Collector Power Dissipation (Pc): 40 Watt
  • Minimum DC Current Gain (hFE): 750
  • Max Storage & Operating temperature: –55 to +150 Centigrade


NPN Complementary:

NPN Complementary of BD680 is BD679


Replacement and Equivalent:

BD684, MJE700, MJE701, MJE702, MJE703, BD682G, KSE703, BD780, BD682, NTE254, BD702, BD338, BD334


BD680 Transistor Explained / Description:

BD680 is a PNP high gain medium power Darlington transistor available in TO-126 package. The transistor is designed to use be used in general purpose switching and amplification purposes. It is a transistor of BD6xx series which also contains other transistor such as BD676, BD676A, BD678, BD678A, BD680A and BD682. There are also NPN complimentary of these transistors which are BD675, BD675A, BD677, BD677A, BD679, BD679A and BD681. All these PNP and NPN transistors can be replaced with each other if your load requires low voltage. But if your load requires high voltage then you should choose a transistor from these transistors that has collector-emitter voltage that is a little bit above your load requirement.

Looking at the absolute maximum ratings of the transistor the maximum collector-emitter voltage is 80V, maximum collector-base voltage is 80V, max collector current is -4A, max emitter-base voltage is 5V, max base current is 0.1A and total device dissipation is 40W.


Where We Can Use it & How to Use:

BD680 is designed to be used in general purpose amplifier and switching applications. But it is not limited to these applications and can also be used in variety of other general purpose applications.

For using the transistor as a switch first confirm the pinout of the transistor. After that if you want to use the transistor as an amplifier then connect its base with the signal from which you want to control the load. Then connect its emitter pin with the positive supply of the circuit and the collector with the positive connection of the load and the negative connection of the load will be connected with the negative supply of the circuit.



Audio Amplifiers

Motor Control

Switching Circuits

Pulse Generator

DC to DC Converters

LED Drivers

Battery Operated Applications

Voltage Regulation

Power Supplies

Voltage inverters


Safe Operating Guidelines:

Below are some safe operating guidelines for this transistor.

  • To get long term performance do not drive the transistor to its absolute maximum ratings and stay at least 20% below from its max ratings.
  • So, therefore, the max collector to emitter voltage is -80V therefore do not drive load of more than -64V.
  • The maximum collector current is -4A so the derived load should be under 3.2A.
  • Additionally, the storage and operating temperature should be between -55°C and below 150°C.



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

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