2SB1218GQL

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A 2SB1218GQL is an NPN-type, high-power transistor specially designed for use in audio amplifiers. It is highly reliable and offers excellent temperature stability and surge ratings. This article will discuss the application field of the 2SB1218GQL transistor and its working principle.

Application Field

The 2SB1218GQL transistor is mainly used in audio amplifiers, its primary application field being a power amplifier with supply voltage up to 80V. It can be used as a power amplifier in a variety of sound equipment, such as hi-fi systems, car audio systems, PA systems, and professional audio equipment. It also can be used in HF power amplifiers, power supplies, and motor controls. In addition, the 2SB1218GQL can be used in other general purpose applications as an NPN-type power transistor.

Working Principle

The functional principle of the 2SB1218GQL transistor is based on the depletion type transistor. A depletion type transistor consists of two heavily doped N-type regions respectively placed in the middle of a lightly doped P-type region. As a result, when a voltage is applied to the gate, the voltage forces the electrons in the N-type regions to move toward the P-type region, which generates electric field that makes the transistor conductive. Thus, the transistor can produce current flow depending on the gate voltage.

The 2SB1218GQL transistor has two important characteristics: its on-resistance hFE and its P-N junction leakage current I Leakage . The hFE (also known as DC current gain) is the transistor’s maximum current that can be sourced from collector to emitter. The I Leakage is the maximum current flow from collector to emitter in the absence of any gate voltage. When the I Leakage is greater than the hFE, the transistor will not start conducting until the input voltage is greater than I Leakage .

Conclusion

The 2SB1218GQL is an NPN-type, high-power transistor specialized for use in audio amplifiers. Its application field includes power amplifiers, HF power amplifiers, power supplies, and motor controls. It works on the principle of depletion-type transistors, characterized by hFE and I Leakage. This discussion described the application field and working principle of the 2SB1218GQL transistor.

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