BUF644 ,Silicon NPN High Voltage Switching Transistor - 400V, 4A,TO-220

The BUF644 is a Silicon NPN High Voltage Switching Transistor manufactured by Vishay Telefunken, designed for high-speed switching applications. Featuring a robust TO-220 package, this transistor delivers outstanding performance with low switching losses and optimized Reverse Bias Safe Operating Area (RBSOA).

Its high-speed switching capability (up to 100 kHz) and high reverse voltage make it suitable for a wide range of high-frequency power conversion applications, such as electronic lamp ballast circuits and switch-mode power supplies. This transistor is built using advanced planar passivation technology, ensuring reliability and efficiency under demanding conditions.

Its 70W power dissipation, low thermal resistance, and 500V collector-base voltage provide excellent operational stability for long-term use in industrial environments. The BUF644’s compact design and high-speed switching characteristics make it an essential component for modern power electronics.

Key Features :

• High-speed switching with a 100 kHz rate.
• Optimized RBSOA for stable performance under high voltages.
• Low switching losses, ensuring energy efficiency.
• Withstands up to 500V collector-base voltage.
• Designed with planar passivation technology for reliability.
• Compact TO-220 package for easy mounting and integration.