The BUF420A from STMicroelectronics is a high-voltage, fast-switching NPN power transistor that is designed to address a wide range of applications requiring high speed and high voltage capabilities. This device is particularly suitable for use in horizontal deflection systems for TVs and monitors, but it also finds applications in switched-mode power supplies and high-frequency inverters.

Key Features

• Voltage Capabilities: The BUF420A is capable of withstanding high voltages, with a collector-emitter voltage (V<sub>CEO) of up to 450V, which makes it ideal for high voltage applications.
• Current Handling: This power transistor can handle continuous collector currents up to 20A, making it suitable for high-power circuits.
• Speed: With its fast-switching capabilities, the BUF420A can switch on and off rapidly, a feature that is critical for high-frequency operations.
• Power Dissipation: It has a high power dissipation capacity, up to 125W, which allows it to handle significant energy without overheating.
• Silicon Triple Diffused Type: The construction of the BUF420A is based on a silicon triple diffused process, which ensures reliable operation and performance consistency.

Applications

• Horizontal deflection for CRT TVs and monitors
• Switched-mode power supplies (SMPS)
• High-frequency inverters
• Lighting applications
• Power regulators

Product Specifications

The BUF420A is a testament to STMicroelectronics' commitment to providing advanced semiconductor solutions that meet the evolving needs of the electronics industry. With its robust design and impressive electrical characteristics, the BUF420A is an excellent choice for designers looking for a reliable and efficient high-voltage transistor.