BDX33 Transistor Pinout, Equivalent, Features, Applications and More

BDX33 is a high gain Darlington NPN power transistor available in TO-220 package. In this post we will understand BDX33 transistor pinout, equivalent, features, applications and other important details of the transistor.

Absolute Maximum Ratings:

• Package Type: TO-220
• Transistor Type: NPN Darlington
• Max Collector Current(I_C): 10A
• Max Collector-Emitter Voltage (V_CEO): 45V
• Max Collector-Base Voltage (V_CBO): 45V
• Max Emitter-Base Voltage (VEBO): 5V
• Max Collector Power Dissipation (Pc): 70 Watt
• Minimum DC Current Gain (h_FE): 750
• Max Storage & Operating temperature: -65 to +150 Centigrade

 

PNP Complementary:

PNP Complementary of BDX33 is BDX34

 

Replacement and Equivalent:

BDW93C, BDW42, NTE2343, MJF6388, BDW43, BDT63C

 

BDX33 Transistor Explained / Description:

BDX33 is a Darlington NPN power transistor available in TO-220 package.  It is the transistor of BDX33X series which also contains other transistors such as BDX33A, BDX33B, and BDX33C. All the transistors in this series are almost same, the only difference between these are their voltage ratings for example the voltage ratings of BDX33 is 45V so you can easily replace it with BDX33A and above because their voltage ratings are higher than BDX33. So you cannot use BDX33 in the place of BDX33C because the voltage ratings of the BDX33C are higher than BDX33. But if the load requirements are under 24V then you can use any transistor in the series as an alternative to another.

These transistors are designed for general purpose switching and amplification purposes and can be used in wide variety of applications.

Now looking at the absolute maximum ratings of the transistor the collector-emitter voltage is 45V, collector current is 10A, peak collector current or pulse current is 15A, collector-base voltage is also 45V, base current is 0.25V and collector dissipation is 70W.

There is also a complimentary series of these transistors which are used with them to make a complimentary pair which is mostly used in audio amplifier circuits. The complimentary transistors are BDX34, BDX34A, BDX34B, and BDX34C.

Some electronics components manufacturers also make BDX33D which has higher voltage capability (collector-emitter voltage is upto 120V as compared to the BDX33C so it can be used as an alternative of BDX33C. The complementary of BDX33D and BDX34D.

 

Where We Can Use it & How to Use:

As mentioned above these transistors are designed for general purpose switching and amplification so that means it can be used in a wide variety of different types of switching and amplification and many other types of circuits. The detailed list of its applications can be found below under the Applications heading.

The operating procedure of the transistor is same as we use any other transistor. To use it as a switch connect the signal source from which you want to control the output to the base pin of the transistor through a suitable resistor (From 1K to 10K) connect its emitter pin with the negative supply of the circuit and collector pin with the negative connection of the load and the positive connection of the load will be connected with the positive supply of the circuit.

Now to operate it as an amplifier we are providing here a simple amplifier procedure. Connect the emitter pin with the negative supply of the circuit connect base pin with the signal source you want to amplify through a 102 ceramic capacitor or 1uF electrolytic capacitor, connect the emitter with the negative supply and the collector with the negative wire of the speaker and the positive wire of the speaker will be connected with the positive supply of the circuit.

 

Applications:

DC to DC Converters

Pulse Generator

Voltage inverters

LED Drivers

Switching Circuits

Audio Amplifiers

Motor Control

Voltage Regulation

Battery Operated Applications

 

Safe Operating Guidelines:

To safely operate the transistor follow these guidelines.

• Do not use the transistor to its absolute maximum ratings and always stay 20% below.
• So the maximum collector-emitter voltage of the transistor is 45V but you should not drive load of more than 36V.
• The maximum collector current is 10A therefore do not drive load of more than 8A.
• The storage and operating temperature should be between
• Moreover, the storage and operating temperature of the transistor should also be maintained between -65°C to 150°C.

 

Datasheet:

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

https://datasheetspdf.com/pdf-down/B/D/X/BDX33_FairchildSemiconductor.pdf