BD441 Transistor Pinout, Applications, Features, Equivalent and More

Today we are going to discuss a medium power NPN transistor BD441 available in TO-126 package. In this post you will find BD441 transistor pinout, applications, features, equivalent and other useful details.

Absolute Maximum Ratings:

• Package Type: TO-126
• Transistor Type:  NPN
• Max Collector Current(I_C): 4A
• Max Collector-Emitter Voltage (V_CEO): 80V
• Max Collector-Base Voltage (V_CBO): 80V
• Max Emitter-Base Voltage (V_EBO): 5V
• Max Collector Power Dissipation (P_C): 36W
• Max Transition Frequency (f_T): 3 MHz
• Minimum & Maximum DC Current Gain (h_FE): 20 – 140
• Max Storage & Operating temperature Should Be: -65 to +150 Centigrade

PNP Complementary:

The PNP complimentary of BD441 is BD442

Replacement and Equivalent:

BD337, BD333, 2SD1487, 2SD1485, BD789, 2SC2823, 2SC2751, MJE243, MJE241, BD791.

BD441 Transistor Explained / Description:

BD441 is a NPN transistor available in TO-26 transistor package. The transistor is designed to use in many different types of switching and amplifier applications. But it is not limited to these applications and can also be used in wide variety of other applications which we will discuss later in this article.

BD441 is the transistor of BD4xx series which also contains other transistor like BD435, BD437 and BD439. All these transistors are almost similar but not in collector-emitter voltage so the BD435 collector-emitter (V_CEO) is 32V, BD437 (V_CEO) is 45V, and BD439 (V_CEO) is 60V. Although they are different as regarding their collector-emitter voltage but they are same according to their other characteristics so if you want to replace any of the with BD441 in low voltage circuits such as in under 12V or under 24V circuits or applications then you can replace each of them with other.

Looking at the absolute maximum ratings of the transistor, the maximum collector current of the transistor is 4A which is quite good collector current, max collector to emitter voltage is 80V which is also good and covers wide range of loads, the max emitter-base voltage is 5V and max collector power dissipation is 36W.

Where We Can Use it & How to Use:

As mentioned the transistor designed to use in variety of switching and amplification applications but it is not limited to these uses and can also be used in applications such as driver circuits, PWM Circuits and controller circuits etc. The using procedure of the transistor is same as we use other BJT transistor.

Applications:

Audio Amplifiers

Switching Circuits

Battery Chargers

Solar Circuits

Motor Drivers

LED Drivers

PWM controllers

Relay drivers circuits

Temperature Control Circuits

Relay Driver Circuits

Inverter Circuits

Variety of General Purpose Applications

Safe Operating Guidelines:

Here are the safe operating guidelines of the transistor.

• Do not drive the transistor to its absolute maximum ratings and always stay 20% below from its max ratings.
• So the transistor’s max collector current is 4A but according to the 20% rule the derived load should be under 3.2A.
• The max collector to emitter voltage is 80V so the derived should be under 64V.
• And the storage and operating temperature of the transistor should be above -55°C and below 150°C.

Datasheet:

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

https://datasheetspdf.com/pdf-down/B/D/4/BD439_FairchildSemiconductor.pdf