8541.49.80.00 - Optical coupled isolators

This classification covers optical coupled isolators, which are semiconductor devices designed to transmit electrical signals between two isolated circuits using light. These devices employ optoelectronic principles, typically consisting of an LED and a photodetector housed together in a single package. They are crucial in applications where electrical isolation is paramount, preventing high voltages or electrical noise from one circuit from affecting another. Examples include power supplies, industrial control systems, and medical equipment.

Within the broader category of photosensitive semiconductor devices and light-emitting diodes, this specific subcategory is distinguished by its function as an optical coupling device. While other categories might cover individual LEDs or photovoltaic cells, this classification is for integrated units specifically engineered for signal isolation through light transmission.

As a leaf node, 8541.49.80.00 does not have further subcategories. Therefore, the focus for classification under this HTS code rests on identifying devices that function as optical coupled isolators, meaning they integrate an emitter (like an LED) and a detector (like a phototransistor or photodiode) to provide a barrier against electrical interference and signal transfer. Their primary purpose is insulation, not simply light emission or light detection in isolation.