Overview
The BD140 is a PNP epitaxial planar transistor manufactured by STMicroelectronics. It is housed in a TO-126 plastic package and is designed for medium power linear and switching applications. This transistor is particularly suited for use in audio amplifiers and drivers, often in complementary or quasi-complementary circuits. The BD140 is the PNP counterpart to the NPN BD139 transistor.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Transistor Type | PNP | |
| Package Type | TO-126 | |
| Max Collector Current (Ic) | -1.5 A | |
| Max Collector-Emitter Voltage (Vce) | -80 V | |
| Max Collector-Base Voltage (Vcb) | -80 V | |
| Max Emitter-Base Voltage (Veb) | -5 V | |
| Max Collector Dissipation (Pc) | 12.5 W | |
| Transition Frequency (ft) | 190 MHz | |
| DC Current Gain (hFE) | 25 - 250 | |
| Operating Temperature Range | -55 to +150 °C |
Key Features
- High current handling capability up to 1.5 A, making it suitable for driving high power loads such as LEDs, relays, and motors.
- High collector-emitter and collector-base voltage ratings of 80 V, ideal for circuits operating at or below 80 V DC.
- Maximum collector dissipation of 12.5 W, suitable for use in audio amplifier circuits.
- Wide operating temperature range from -55 to +150 °C, ensuring robust performance in various environments.
- Complementary to the NPN BD139 transistor, allowing for balanced circuit designs.
Applications
- Audio amplifiers and drivers
- Switching loads under 1.5 A
- Battery chargers
- Power supplies
- Motor drivers
- Darlington pair configurations
- Educational and hobby electronics projects, including analog circuits and microcontroller projects.
Q & A
- What is the BD140 transistor used for?
The BD140 is used in audio amplifiers, drivers, and various switching applications, including battery chargers, power supplies, and motor drivers.
- What is the maximum collector current of the BD140 transistor?
The maximum collector current of the BD140 transistor is 1.5 A.
- What is the maximum collector-emitter voltage of the BD140 transistor?
The maximum collector-emitter voltage of the BD140 transistor is 80 V.
- What is the operating temperature range of the BD140 transistor?
The operating temperature range of the BD140 transistor is from -55 to +150 °C.
- What is the complementary NPN transistor to the BD140?
The complementary NPN transistor to the BD140 is the BD139.
- What package type is the BD140 transistor available in?
The BD140 transistor is available in the TO-126 plastic package.
- What are some equivalent transistors to the BD140?
Some equivalent transistors to the BD140 include BD238G, MJE171, MJE702, and BD792.
- Why is it important to use a heatsink with the BD140 transistor?
Using a heatsink with the BD140 transistor is important when driving loads above 200 mA to prevent overheating and ensure reliable operation).
- What are the key applications of the BD140 in educational and hobby projects?
The BD140 is commonly used in educational and hobby electronics projects, including analog circuits and microcontroller projects such as Arduino projects).
- How should the BD140 transistor be operated to ensure safe and reliable performance?
To ensure safe and reliable performance, the BD140 transistor should not be operated above its absolute maximum ratings, and it should be used with a suitable heatsink and base resistor. It should also be operated within the specified temperature range and not stored below -55 °C or above +150 °C).
