BDX34B Transistor Pinout, Equivalents, Applications, Features and Other Characteristics

BDX34B is another transistor from the series of BDX34x transistors. In this post we will discuss BDX34B transistor pinout, equivalents, applications, features and other characteristics of this transistor.


BDX34B Transistor Pinout, Equivalents, Applications, Features and Other Characteristics




Absolute Maximum Ratings:

  • Package Type: TO-220
  • Transistor Type: PNP Darlington
  • Max Collector Current(IC): –10A
  • Max Collector-Emitter Voltage (VCEO): –80V
  • Max Collector-Base Voltage (VCBO): –80V
  • Max Emitter-Base Voltage (VEBO): –5V
  • Max Continuous Base Current: -0.25A
  • Max Collector Power Dissipation (Pc): 70 Watt
  • Minimum DC Current Gain (hFE): 750
  • Max Storage & Operating temperature: -65 to +150 Centigrade


NPN Complementary:

NPN Complementary of BDX34B is BDX33B


Replacement and Equivalent:

MJF6668, NTE2344, BDX34D, BDW48, BDX94C, BDT62B, BDW47


BDX34B Transistor Explained / Description:

As discussed in the intro above BDX34B is another transistor from the BDX34x series of PNP Darlington transistors. The other transistors of this series are BDX34, BDX34BA, and BDX34C. All these transistors are slightly different from each other as regards their VCBO and VCEO voltages but if your load requirements are less than -45V then you can use any of these alternatively.

The absolute maximum ratings of the transistor are its collector-emitter voltage is -80V, collector-base voltage is also -80V, collector current is -10A, base current is -0.25A and collector dissipation is 70W.

The transistor is available in TO-220 package and the pin layout of the transistor as follow the first pin is “Base”, second is “Collector” and the third pin is “Emitter.

It is a high gain transistor and designed to be used in switching and power linear applications but can also be used in wide variety of other general purpose applications. The detailed list of its applications can be found below under the “Applications” heading.


Where We Can Use it & How to Use:

BDX34B is designed for switching and power linear applications but can also be used in other applications like driver and controller circuits, voltage converters etc.

The using procedure of the transistor is simple first of all check its pinout and connect now to use as a switch connect its base pin with the input signal (signal from which you want to control the load), connect its emitter pin with the positive rail of the circuit and connect its collector pin with the positive side of the load and the negative side of the load will be connected with the negative rail of the circuit. For using it as an amplifier the connection will be the same but it is also important to use the passive components according to your requirements such as filter capacitors and resistors.



Audio Amplifiers

Motor Control

Pulse Generator

Voltage Regulation

Switching Circuits

LED Drivers

DC to DC Converters

Voltage inverters

Battery Operated Applications


Safe Operating Guidelines:

To operate the transistor safely it is important to use it according to the safe operating guidelines below.

  • Do not use the transistor to its absolute maximum ratings and always stay 20% below.
  • Therefore the maximum continuous current is -10A so the derived load should not be more than -8A.
  • The maximum collector to emitter voltage is -10A therefore the derived load should be under 8A.
  • The internal and surrounding temperature of the transistor should be between -55°C to 150°C.


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

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