BD239D-S

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The BD239D-S is a high-voltage, high-current, NPN power transistor, designed for use in audio amplification, voltage regulation, and DC-DC converters. It is a key component in the power circuitry of many electronic devices, from high-fidelity stereos and amplifiers, to industrial motor controllers and power supplies. The BD239D-S is a part of a series of power transistors manufactured by On Semiconductor, with a range of current ratings from 0.5A to 15A.

The BD239D-S is a metal-can packaged device that uses a silicon NPN transistor to amplify and regulate current in power systems. It is a Single Bipolar (BJT) transistor, as it has two active regions, one heavily doped region (p+) and one lightly doped region (n+). When a small current is introduced between the emitter (n+ region) and the base (p+ region), a large current can be amplified and regulated through the collector (p+ region). The collector’s output is connected to the device’s output circuit, which is where the current or voltage is used or regulated.

The BD239D-S is rated for 80V maximum collector-emitter voltage, and its gain is usually in the range of 50 to 200. The device has a power dissipation rating of up to 1.3W, and a maximum collector current rating of up to 15A. The BD239D-S is also equipped with a built-in damper diode, allowing it to protect itself from reverse voltages and surge currents.

The BD239D-S has a wide range of applications, and can be used in many power control circuits. It is well-suited for use in motor controllers and DC-DC converters, where it can accurately regulate output current. It can also be used in audio preamplifiers, amplifiers and line drivers, where it can amplify signals to the desired level. The BD239D-S is also well-suited for high-voltage, low-current applications, such as voltage regulators.

In conclusion, the BD239D-S is a high-voltage, high-current, silicon NPN power transistor that can be used in many power control circuits. It is a Single Bipolar (BJT) transistor, and has a wide range of applications, from motor controllers and DC-DC converters, to audio preamplifiers, amplifiers and line drivers. The device has a built-in damper diode to protect itself from reverse voltages and surge currents, and its collector current rating is up to 15A. The BD239D-S is a reliable, robust and versatile device, suitable for many types of power control applications.

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