bd139 transistor

bd139 transistor
bd139 transistor

BD139 specification

  • It is a bipolar NPN BJT Transistor
  • DC Current Gain range is 25 to 250 hFE
  • Collector current (IC) is 1.5A
  • Collector to base Voltage (VCB) is 80V
  • Collector to emitter Voltage (VEB) is 80V
  • Emitter to base voltage (VEB) is 5V
  • Base Current (IB) is 0.5A maximum
  • Transition frequency (FT) is 50MHz

BD139 pinout

Pin Number Pin Name Description
Pin Number1 Pin NameEmitter DescriptionCurrent flows out through emitter
Pin Number2 Pin NameCollector DescriptionCurrent flow through the collector
Pin Number3 Pin NameBase DescriptionThe base terminal triggers the transistor


BD139 pinout
BD139 pinout

BD139 package

  • The BD139 transistor had TO-126 and TO-225 packages
  • It is a rectangular-shaped transistor package and with a hole at the middle portion.
  • The hole at the middle portion supports the transistor to mount it with the board or with the heat sink.
  • The plastic-epoxy material usage will make the transistor more temperature resistant and compatible
BD139 package
BD139 package

If you need the datasheet in pdf please click this link

BD139 Description

  • The Pinout of the BD139 is different, due to this reason the connection configuration will be different.
  • The current gain range for the BD139 transistor will be 25 to 250hFE, and it is an important transistor value in terms of amplification.
  • The peak collector current of the BD139 transistor is 1.5A, this value will be the peak current value for a transistor device.
  • The peak base current of the BD139 transistor is 0.5A, the maximum allowable bias voltage on the trigger terminal.
  • Maximum power dissipation at the BD139 transistor is 12.5w, this will show that it is a powerful transistor device.
  • The transition frequency on the BD139 transistor is 50MHZ, it is an important factor at the transistor switching frequency.
  • The maximum junction temperature at the BD139 transistor is 150°C.

BD139 transistor datasheet

BD139 transistor datasheet
BD139 transistor datasheet

If you need the datasheet in pdf please click this link

BD139 transistor Equivalent

  • The transistor equivalent for BD139 transistor is BD169, BD179, BD230, MJE244, or MJE722.
  • Each one at the equivalent list is the perfect equivalent for the BD139 transistor.
  • Most of the electrical specifications and technical specifications of all of the transistors are the same.

 BD139 vs BD140 vs MJE242 vs BD379

BD139 BD140 (PNP) MJE242 BD379
Collector to base voltage (VCB) BD13980V BD140 (PNP)-80V MJE24280V BD379100V
Collector to emitter voltage (VCE) BD13980V BD140 (PNP)-80V MJE24280V BD37980V
Emitter to base voltage (VEB) BD1395V BD140 (PNP)-5V MJE2427V BD3795V
Collector current (IC) BD1391.5A BD140 (PNP)1.5A MJE2428A BD3792A
Power dissipation BD13912.5W BD140 (PNP)12.5W MJE24215W BD37925W
Junction temperature (TJ) BD139150°C BD140 (PNP)150°C MJE242150°C BD379150°C
Transition frequency (FT) BD13950MHZ BD140 (PNP)160MHZ MJE24240MHZ BD37950MHZ
Noise (N) BD139——– BD140 (PNP)——- MJE242——- BD379———
Gain (hFE) BD13925 to 250hFE BD140 (PNP)25 to 250hFE MJE24225 to 250hFE BD37930 to 250hFE
Package BD139TO-126 TO-225 BD140 (PNP)TO-126 MJE242TO-126 BD379TO-126


BD139 Application

  • RF amplifier circuit
  • Switching circuits
  • Amplifier circuits
  • Audio amplifier circuits
  • Load driver circuits
  • Arduino circuit applications

BD139 switch circuit

  • The figure shows the basic model switch circuit using the BD139 transistor.
  • Both the resistors used on the circuit is for driving transistor and LEDs
  • At the time the switch closes, the resistor on the base of the transistor provides a voltage to trigger the BD139 transistor.
  • And the trigger pulse reaches the LED, it starts glowing.
BD139 switch circuit
BD139 switch circuit

BD139 amplifier circuit

  • The figure shows a mini amplifier circuit using a BD139 transistor.
  • The amplifier circuit consists of two-stage of the transistor, 2n3904 and BD139 transistor.
  • Both of the transistors are identical in technical specifications.
  • The transistors are in a common emitter configuration, so when the input signal reaches the input capacitor, they bypass the signal to the Q1 transistor.
  • The Q1 transistor amplifies the signal and forwards towards the second transistor Q2.
  • The Q2 transistor BD139 makes second stage amplification and forwards to the output.
BD139 amplifier circuit
BD139 amplifier circuit

BD139 Arduino

  • The figure shows the Arduino project using BD139 transistor, the BD139 transistor had applications on speed controlling projects.
  • This particular circuit is for controlling the speed of the cooler, as we can see on the circuit, the BD139 is connected to the PMW terminal.
  • The pulse based on the Arduino board, the BD139 transistor control the speed of the cooler.
BD139 Arduino
BD139 Arduino

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