BD137 Transistor Pinout, Equivalent, Datasheet And More

BD137 is a TO-126 packaged NPN transistor. In this post you will find BD137 transistor pinout, equivalent, datasheet, and more information on how and where to use this transistor in an electronic circuit.


BD137 Transistor Pinout, Equivalent, Datasheet And More



Features / Technical Specifications:

  • Package Type: TO-126
  • Transistor Type: NPN
  • Max Collector Current(IC): 1.5A
  • Max Collector-Emitter Voltage (VCE): 60V
  • Max Collector-Base Voltage (VCB): 60V
  • Max Emitter-Base Voltage (VEBO): 5V
  • Max Collector Dissipation (Pc): 12.5 Watt 
  • Max Transition Frequency (fT): 190 MHz
  • Minimum & Maximum DC Current Gain (hFE): 25 – 250
  • Max Storage & Operating temperature Should Be: -55 to +150 Centigrade


PNP Complementary:

PNP Complementary of BD137 is BD138


Replacement and Equivalent:

BD230, 2SC5171S, BD349, and BD379


BD137 Transistor Explained / Description:

BD137 is a perfect NPN transistor if you are looking to replace a normal TO-92 transistor to a little bit high power to operate more loads in your circuit. BD137 is one of a transistor of BD13x low cost and high performance transistor series, Other NPN transistors of this series are BD135 & BD139 and there are also PNP complementary of these transistor are available which are BD136 & BD140. One of a good features of this transistor is that the output / collector current of the transistor is 1.5A or 1500mA due to which it can drive variety of loads in your circuits. On the other hand the DC current gain of 25 to 250 and the max collector dissipation of 12.5 Watts making it ideal to use in audio amplification and other signal amplification in electronic circuits.



Where We Can Use it & How to Use:

BD137 can be used in any general purpose switching and audio amplification and other signal amplification applications. When using as a switch it can drive variety of loads in an electronic circuit such as motors, LEDs, high power transistors, part of a circuit, relay switches, ICs etc. and it can also be used at the output of arduino, raspberry pi and other platforms.  Other than that when using as an amplifier it can be used as a separate amplifier at the output of any device to drive speaker directly, used in audio amplification stages and different types of signal amplifications.



Audio Amplifiers

Switching Loads under 1.5A or 1500mA

Battery Chargers Circuits

Power Supply Circuits

Motor Driver Circuits

Darlington Pairs


How to Safely Long Run in a Circuit:

To get long term performance with this transistor in your circuit it is suggested to always stay some values below the maximum ratings, touching the maximum ratings can cause stress on the transistor that can result in permanent damage of this component. Do not operate load of more than 80V and 1.5mA. Always use a suitable heatsink with the transistor, always use a suitable base resistor and do not operate and store this transistor in temperature below -55 Celsuis an above +150 Celsius.



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

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