8542.39.00.70 - With adjustable performance characteristics, not elsewhere specified or included

HTS code 8542.39.00.70 covers electronic integrated circuits that possess adjustable performance characteristics and are not specifically enumerated in other HTS subheadings. This broad category is designed to capture integrated circuits whose operational parameters, such as gain, frequency response, or power consumption, can be modified or "tuned" post-manufacturing through external signals or programming. Such adjustability distinguishes them from static or fixed-function integrated circuits.

This subheading serves as a residual category for integrated circuits with adjustable performance characteristics that do not fit into more specific "other" subheadings at the 8542.39 level. For instance, while sibling categories like RF transceivers (8542.39.00.10) and active filters (8542.39.00.20) address specific functional types, and data converters have their own designated subcategories, this classification is for those with adjustable performance that do not fall under these more precise definitions, nor under the general "other" residual category (8542.39.00.90) unless their adjustability is the defining characteristic not covered elsewhere.

As this is a leaf node, there are no further subcategories. Classification under this code hinges on the presence of adjustable performance characteristics and the absence of a more specific HTS provision. Importers should carefully examine the technical specifications and intended use of the integrated circuit to confirm that it meets the criteria of adjustable performance and is not covered by a more narrowly defined classification within Chapter 85.