Hello friends! Welcome back to ElectroDuino. Hope you all are doing well. This blog is based on the BD140 Transistor – Pin Diagram, Specifications & Working Principle. Here we will discuss the Introduction to the BD140 transistor, Pin diagram, How it Works, Specification, Features, Equivalent, Applications, and Download Datasheet.
The BD140 is a PNP type medium power bipolar junction transistor (BJT) that is mainly used in many electronics circuits for switching and amplification purpose. This transistor comes in the TO-126 package. The collector current of this transistor is 1.5A, so it can handle current up to 1.5A, and it can be used to drive loads up to 1.5A. This Transistor has high collector-emitter and collector-base voltage of maximum of 80 volts, which makes it ideal to use in 80 volts DC or below 80 volts circuits. And the collector dissipation of this transistor is around 12.5 watt due to this it’s good for use in audio amplifier circuits.
Pin Configuration/ Pin Diagram/ Pinout of Bd140 Transistor
|Pin No.||Pin Name||Symbol||Functionality|
|1||Emitter||E||This terminal is normally connected to the GND terminal of the power supply and the current drain out through it.|
|2||Collector||C||This terminal is normally connected to the load, and the current flows in through this terminal.|
|3||Base||B||The base terminal is used to control the transistor biasing; it means this terminal is used to switch ON/OFF the transistor.|
Note: Download the BD140 datasheet given at the end of this page to get Complete Technical Details.
Working principle of Bd140 Transistor
As mentioned Bd140 is a PNP transistor, so, in it the N-doped layer is embedded between two P-dopped layers. The collector and emitter are left closed when the base pin is held at the ground and are open when a signal is provided to the base pin. Since Bd140 is a PNP transistor so the majority of charge carriers are holes.
When no current is applied to the base terminal, then it will work in forward biased condition and it turns on. This condition is termed as Saturation Region.
When sufficient current is applied at the base terminal of this transistor, then it will work in Reverse biased condition and it turns off. This situation is termed as cut-off region.
How to use BD140 Transistor?
The Bd140 transistor has huge use in the applications of switches and amplifiers in electronics.
Transistor Work as a Switch
As the BD140 is a bipolar junction transistor, so it is a current-controlled device i.e.a little current is applied at the base terminal to control the transistor. The BD140 is a PNP transistor, so it will be ON when the base terminal is connected to the ground, and it will be off when a positive voltage is applied to the base terminal of the transistor. The base current of this transistor is less than 10mA.
Specifications and Features of Bd139 Transistor:
- Transistor type: PNP
- Collector Current(IC): -1.5A Max
- Collector-Emitter Voltage (VCE): –80V Max
- Collector-Base Voltage (VCB): –80V Max
- Emitter-Base Voltage (VEBO): –5V Max
- Collector Dissipation (Pc): 12.5 Watt
- Transition Frequency (fT): 190 MHz
- DC Current Gain (hFE): 25 to 250
- Max Storage & Operating temperature Range: -55 to +150 Centigrade
- Package Type: TO-126
Equivalent Transistors of BD140 Transistor:
In an electronic circuit, we can replaced this transistor with BD238G, MJE171, MJE702, BD792, BD170,BD180,BD231, BD790,BD792, BD792
- It is used in Audio Amplification.
- Used for Switching Purposes.
- It is having great use in motor control circuits.
- It can be used in H-bridge circuits and motor control circuits.
- Also used in Astable and Bistable multivibrators.
- Battery Chargers Circuits
- Different types of Power Supplies
2D-Model and Physical Dimensions (TO-225)