BUX87

The STMicroelectronics BUX87 is a high-voltage NPN transistor designed for various applications, particularly in the field of power electronics. This device is known for its robustness, reliability, and versatility, making it suitable for a wide range of electronic circuits, including switching applications, amplifiers, and general-purpose use. Below is a detailed overview of the specifications, features, and applications of the BUX87.

### Overview

The BUX87 is a high-voltage transistor that operates in the NPN configuration. It is designed to handle significant power levels, making it ideal for applications that require efficient switching and amplification. The transistor is particularly well-suited for use in power supplies, motor control circuits, and audio amplifiers.

### Key Specifications

1. Transistor Type: NPN
2. Maximum Collector-Emitter Voltage (Vce): 80 V
3. Maximum Collector-Base Voltage (Vcb): 80 V
4. Maximum Emitter-Base Voltage (Veb): 5 V
5. Maximum Collector Current (Ic): 3 A
6. Maximum Power Dissipation (Ptot): 40 W (at Tcase = 25°C)
7. DC Current Gain (hFE): 20 to 100 (at Ic = 1 A)
8. Transition Frequency (fT): 100 MHz (typical)
9. Thermal Resistance (RthJC): 3 °C/W (junction to case)
10. Package Type: TO-220
11. Operating Temperature Range: -65°C to +150°C

### Performance Features

- High Voltage Capability: With a maximum collector-emitter voltage of 80 V, the BUX87 is suitable for high-voltage applications, allowing it to be used in various power circuits without the risk of breakdown.
- High Current Handling: The transistor can handle collector currents up to 3 A, making it ideal for applications that require significant power levels.
- Good Gain Characteristics: The DC current gain (hFE) range of 20 to 100 ensures that the transistor can effectively amplify signals, making it suitable for use in audio and RF applications.
- Fast Switching Speed: With a transition frequency of 100 MHz, the BUX87 can operate efficiently in high-frequency applications, providing fast response times for switching operations.
- Robust Thermal Performance: The low thermal resistance allows for effective heat dissipation, ensuring reliable operation even under high load conditions.

### Applications

The STMicroelectronics BUX87 is versatile and can be used in a variety of applications, including:

- Power Amplifiers: Suitable for audio and RF power amplifiers, providing the necessary gain and power handling capabilities.
- Switching Regulators: Used in power supply circuits, including buck and boost converters, where efficient switching is essential.
- Motor Control: Ideal for driving motors in various applications, including industrial automation and consumer electronics.
- Signal Amplification: Employed in signal amplification circuits, such as in communication devices and audio equipment.
- General-Purpose Switching: Can be used in various general-purpose switching applications, including relays and control circuits.

### Conclusion

The STMicroelectronics BUX87 is a high-voltage NPN transistor that offers a combination of robustness, reliability, and versatility for a wide range of electronic applications. With its high voltage and current handling capabilities, good gain characteristics, and fast switching speed, it is an excellent choice for designers looking to implement efficient power management and amplification solutions. Whether in power supplies, motor control, or audio applications, the BUX87 provides the necessary specifications to ensure optimal performance in demanding environments.