9027.90.45.00 - Printed circuit assemblies for the goods of subheading 9027.81 or 9027.89

This HTS category, 9027.90.45.00, specifically covers printed circuit assemblies (PCAs) that are intended for use with analytical instruments classified under subheadings 9027.81 or 9027.89. These subheadings generally encompass instruments and apparatus for physical or chemical analysis. Therefore, the PCAs falling into this category are integral electronic components that enable the functionality and control of specific types of analytical equipment.

The primary distinguishing factor for this category is the explicit link to PCAs for instruments of 9027.81 or 9027.89. It differentiates these specific circuit assemblies from other "Parts and accessories" within heading 9027, particularly from the "Other" sibling category (9027.90.45.50) which would cover general spare parts and accessories not specifically defined elsewhere. The intended application is paramount; a printed circuit assembly for a spectrometer or gas analysis apparatus would fall here, whereas a general-purpose circuit board not tied to these specific analytical functions would likely be classified elsewhere.

As this is a leaf node, there are no further subcategories. Classification within 9027.90.45.00 is contingent upon the PCA being a printed circuit assembly and its direct compatibility and intended use with the analytical instruments of subheadings 9027.81 or 9027.89. This requires careful examination of product documentation and the functional role of the PCA within the larger analytical apparatus.