BD905 Transistor Pinout, Equivalents, Applications, Feature and Other Data

BD905 is another transistor from a series which also contains another 3 transistors which we will discuss in this post. This post contains detail information about BD905 transistor such as its pinout, equivalents, applications, features and other data.

 

 

Absolute Maximum Ratings:

• Package Type: TO-220
• Transistor Type: NPN
• Max Collector Current(I_C): 15A
• Max Collector-Emitter Voltage (V_CEO): 45V
• Max Emitter-Base Voltage (VEBO): 5V
• Max Base Current (I_B): 5A
• Max Collector Power Dissipation (Pc): 90W
• Minimum & Maximum DC Current Gain (h_FE): 40 to 250
• Max Storage & Operating temperature Should Be: -65°C to 150°C

 

PNP Complementary:

PNP Complementary of BD905 is BD906

 

Replacement and Equivalent:

BD909, BD911, BD743A/B/C/D

 

BD905 Transistor Explained / Description:

BD905 is a NPN bipolar junction transistor designed to be used in power linear (Amplifier) and switching applications. It is a transistor of a series that also contains other transistors such as BD907, BD909 and BD911. The transistor has many good featureS which are collector-emitter voltage of 45V, continuous collector current of 15A, transition frequency of 3MHz, DC current gain of 40 to 250 and availability of their PNP complimentary.

Looking at the pin configuration of the transistor the first pin is Base second pin is Collector and the third pin is Emitter.

The absolute maximum ratings of the transistor are collector-base voltage of 45V, continuous collector current is 15A, collector-emitter voltage is 45V, emitter-base voltage is 5V, base current is 5A, collector power dissipation is 90W and storage and junction is -65°C to 150°C.

All the above features and specs makes this transistor an ideal device to be used in wide variety of general purpose and other applications some of them are controller circuits, battery chargers, power supplies, etc. Please check below for detailed list of its applications under “Applications” heading.

 

How to Use this Transistor:

Here is the basic concept of how to use this transistor, we are explaining the basic concept about how you can use this transistor as a simple switch or amplifier so you can understand it but you can always use other passive components to enhance the circuit. You can also find lots of complete circuits of single transistor as an amplifier and switch on internet.

To use the transistor as a basic switch connect the emitter pin with the negative rail of the circuit, apply signals to its base pin (The signals from which you want to control the output load). But use a current limiting resistor between base pin and the signals applied is important to use. Connect the load between the collector pin and the positive rail of the circuit. So the loads positive wire will be connected to the positive rail of the circuit and the negative wire will be connected with the collector pin of the transistor.

Almost same procedure will follow in simple one transistor amplifier circuit only few things will be different. Connected the emitter pin with the negative rail of the circuit, apply signals you want to amplify to the base pin but in the place of current limiting resistor which we have used in the switch circuit use a capacitor for example a 2.2uF electrolytic capacitor or the one that is suitable and connect the collector pin with the negative wire of the speaker through a suitable electrolytic capacitor which will stops the voltage directly going to the speaker and only transfer audio signals.

 

Applications:

Audio Amplifiers

Inverters

Converters

Lighting Control Circuits

Voltage regulators

Power Supplies

Telecommunication

DC-DC Converters

Battery Charger Circuits

Motor Controller Circuits

 

Safe Operating Guidelines:

Here are the safe operating guidelines of the transistor.

• Use the transistor at least 20% below from its absolute maximum ratings.
• So the maximum continuous collector current is 15A but you should now drive load of more than 12A.
• The maximum collector-emitter voltage is 45V but you should not drive load of more than 36V.
• Using a suitable heatsink is must.
• The Storage and operating temperature should be between -65°C to 150°C.

 

Datasheet:

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

https://www.alldatasheet.com/datasheet-pdf/view/606238/CDIL/BD905.html