8541.21.00.75 - With an operating frequency not less than 100 MHz

This HTS category, 8541.21.00.75, specifically classifies transistors that have a rated operating frequency of 100 MHz or higher. These are typically semiconductor devices designed for amplification or switching applications, where high-frequency performance is a critical characteristic. This includes transistors utilized in radio frequency (RF) circuits, telecommunications equipment, and high-speed digital logic. The key differentiator for inclusion in this subcategory is the specified operational frequency, indicating the device's capability to function effectively at these elevated speeds.

Within the broader classification of transistors (excluding photosensitive transistors) with a dissipation rate of less than 1 Watt, this category is distinct from its sibling, 8541.21.00.95, which covers "Other" transistors meeting the same general criteria but not specifically defined by their operating frequency. Therefore, if a transistor's datasheet or technical specifications confirm an operating frequency of 100 MHz or greater, it would fall under this code. Conversely, transistors operating below this frequency threshold, or those for which frequency is not a primary defining characteristic, would be classified under the "Other" sibling category.

As a leaf node, this classification does not have further subcategories. The classification is determined by the specific operational frequency criterion. This means that once a transistor meets the criteria of being a transistor (other than photosensitive), with a dissipation rate of less than 1 Watt, and an operating frequency of 100 MHz or more, it is classified directly under 8541.21.00.75. There are no further subdivisions based on specific types of high-frequency transistors within this particular code.