The emitter terminal is connected to the ground of the power supply, the collector terminal is connected to the positive power supply through a load, here we have used a LED as load. Here we are using a simple circuit to easily understand how it works as a switch. The BD139 transistor can be used as a switch to control lamps, relays, or even motors.
The BD139 transistors have numerous use in the applications of switches and amplifiers i.e., the two main uses of any transistor existing in the electronics arena. When no current is applied at the base terminal of this transistor, it turns off and this situation is termed as cut-off region. The maximum voltage that can be provided across emitter and collector terminals is 80 V. And the magnitude of this supplied current must be more in than the collector current. If the maximum current of 1.5A is supplied throughout this transistor then it will be in Saturation Region. In this condition, the maximum current drawn by the emitter and collector is 1.5A. When the sufficient current is applied to the base terminal, then it will work in forward biased condition and it turns on. Since BD139 is an NPN transistor so the majority of charge carriers are electrons. The collector and emitter are left open when the base pin is held at the ground and are closed when a signal is provided to the base pin. Working principle of BD139 TransistorĪs mentioned BD139 is an NPN transistor, so, in it the p-doped layer is embedded between two n-dopped layers.
Note: Download the BD139 datasheet given at the end of this page to get Complete Technical Details. Like every other transistor even BD139 has three terminals mentioned below Pin Configuration/ Pin Diagram/ Pinout of BD139 Transistor: Its saturation voltage is 0.5 V and collector terminals dissipation current is 12.5 W with high collector-emitter and collector-base voltage. This transistor has a gain value of ranges from 40 to 160 which determines the amplification capacity for the transistor. it is in the plastic package of TO-126, TO-225 and SOT-32. BD139 is a BJT (Bipolar Junction Transistor) NPN Transistor, basically used in many electronic circuits as switches or amplifiers like in motors, relays, high power LEDs, etc. Equivalent Transistors of BD139 Transistor:Ī semiconductor device used to amplify electrical signals and power is called a transistor.Specifications and Features of Bd139 Transistor:.Pin Configuration/ Pin Diagram/ Pinout of BD139 Transistor:.
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