ST1802HI

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ST1802HI is a vertical multi-gate bipolar junction transistor (BJT) designed to bring together superior features such as high voltage gain, wide input/output dynamic range and low noise in just one package. This device is ideal for applications such as AM/FM radio, home stereo, professional audio and medical equipment.

The device is constructed with a vertical NPN transistor featuring multiple emitter gates. These emitter gates are connected to the collector and the base, providing excellent gain and gain flatness. This allows the device to operate over a wide frequency range, while holding its gain constant. The base is internally connected to two separate resistors, allowing it to handle input/output signals with different voltages. This results in a bipolar device that is capable of operating from low to moderate levels. A low on-resistance makes the ST1802HI suitable for high power applications as well.

In terms of working principle, the ST1802HI operates in three main modes. First, there is the “short” circuit mode, where the input and output terminals are connected. In this mode, the collector current is directly proportional to the base current. When the input voltage is increased, the collector current increases as well, resulting in a gain. Second, there is the “open” circuit mode, where the input and output terminals are not connected. In this mode, the device works like a voltage amplifier, where the collector current is proportional to the base-emitter voltage. Last, there is the “ground” circuit mode, where the output terminal is connected to the ground. In this mode, the collector current is inversely proportional to the base-emitter voltage.

Overall, the ST1802HI is a versatile and powerful multi-gate BJT. Its superior features, wide frequency response and low resistances makes it an ideal choice for various applications. Furthermore, its simplified design allows for easy use and setup, making it a perfect solution for any designer.

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