BD249 NPN Silicon Power Transistor

The BD249 is a robust NPN silicon power transistor designed for high-current switching and power amplification applications. It is specifically engineered to handle demanding electrical loads, such as those found in motor controllers, high-power audio amplifiers, and DC-to-DC converters. Because of its high collector current rating and rugged construction, it operates reliably in heavy-duty industrial and consumer electronic systems. The device is frequently paired with the BD250 PNP transistor for use in complementary push-pull amplifier configurations to achieve symmetrical power handling. Its large plastic package provides a broad surface area for mounting to a heat sink, which is essential for maintaining stability and performance at its maximum 125-Watt power rating.

Key Features:

Collector emitter voltage (VCEO) rating of 45 Volts.

Total power dissipation (Ptot) of 125 Watts at 25 degrees Celsius case temperature.

DC current gain (hFE) typically ranging between 15 and 60.

Low saturation voltage for efficient high-current switching.

Large TO-3PN (or TO-247) package for superior heat dissipation.