The ET3542 series is classified as a high-performance through-hole common-mode choke, belonging to the category of electromagnetic interference suppression components, and is mainly categorized as an industrial-grade power line filtering device. This type of component adopts sectional winding as the core process, relies on the characteristics of Mn-Zn ferrite core, focuses on EMI/RFI interference shielding and noise filtering functions, adapts to the power circuit protection of industrial and general electronic equipment, and has the advantages of compliance and multi-specification adaptation, serving as an indispensable basic filtering component in industrial electronic systems. It is classified as a RoHS-compliant through-hole device, categorized as an interference suppression choke by function, and subdivided as an industrial equipment-specific filtering component by application scenario, differing from ordinary consumer-grade filtering devices and emphasizing stable protection performance under complex working conditions.