BD442 Transistor Pinout, Equivalent, Features, Applications and Other

In this article, we are going to explain BD442 transistor pinout, equivalent, features, applications and other useful information about this transistor.





Absolute Maximum Ratings:

  • Package Type: TO-126
  • Transistor Type:  PNP
  • 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): 36W
  • Max Transition Frequency (fT): 3 MHz
  • Minimum & Maximum DC Current Gain (hFE): 20 – 140
  • Max Storage & Operating temperature Should Be: -65 to +150 Centigrade


NPN Complementary:

The NPN complimentary of BD442 is BD441


Replacement and Equivalent:

MJE1092, MJE253, MJE251, BD684, BD792, BD442G, BD338, NTE2346, MJE703, MJE702, BD334, 2SB995, 2SB975, 2SB965, 2SB1373, 2SB1371, 2SB1347, 2SB1057.


BD442 Transistor Explained / Description:

BD442 is a PNP transistor available in TO-126 package. It is a transistor of of BD4XX series which also contains other transistors such as BD434, BD436, BD438 and BD440. All the transistors in this series have almost same electrical characteristics except the collector emitter voltage and some other values but if you are using them in low voltage circuit i.e under 24V or 12V then there will be no difference and you can easily replace them with each other.

The BD442 absolute maximum ratings are maximum collector to emitter voltage of -80V, max collector-base voltage is -80V, max emitter-base voltage is -5V, max collector current is -4A, collector current pulsed is -7A, max base current is -1A and max collector dissipation is 36W.

The transistor is designed to be used in switching and medium power linear applications but can also be used in wide variety of other applications.


Where We Can Use it & How to Use:

As mentioned above this transistor is designed to be used in switching and medium power linear applications which means audio amplifier applications but can also be used in variety of other applications.

Using procedure of the transistor is also same like BJT transistor. Connect its emitter with the ground or negative supply of the circuit, connect the base pin with the output of the circuit, and connect the collector with the load.



Motor Drivers

Inverter Circuits

Solar Circuits

Audio Amplifiers

Switching Circuits

LED Drivers

Inverter Circuits

Relay Driver Circuits

Temperature Control Circuits

Many other General Purpose Applications


Safe Operating Guidelines:

Here are some guidelines to safely operate the transistor.

  • Do not use the transistor on its max absolute maximum ratings.
  • Maximum output current is -4A so do not drive load of more 3.2A.
  • Max load voltage is 60V so the max load will be
  • Do not use the transistor to its absolute maximum ratings and always stay 20% below these ratings.
  • Maximum collector to emitter voltage is 60V so do not drive load of more than 48V.
  • Always store or operate at temperatures above -65°C and below -150°C.



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

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