Product Introduction

This ferrite magnetic ring is manufactured from VN02 grade ferrite material with an initial permeability of 650. It features low loss factor and superior high‑frequency EMI suppression performance. Physical dimensions: outer diameter 14.2±0.5 mm, height 15.0±0.5 mm, inner diameter 7.2±0.4 mm. Benefiting from Curie temperature above 140℃ and high electrical resistivity, it keeps stable magnetic properties under working conditions. Strict dimensional tolerance ensures stable batch‑to‑batch consistency for EMC filtering solutions. Custom specifications are available upon request.

Scope of Application

Widely applied in power adapters, switching power supplies, home appliances, industrial control units, signal cables, data lines, wire harnesses, sensors and communication equipment.

Purpose

It is designed to suppress high‑frequency electromagnetic interference, filter common‑mode noise on cables and harnesses, reduce signal distortion, enhance equipment anti‑interference capacity, and assist finished products to pass EMC compliance tests.

FAQ 

1. Q: How do I select the correct size for ferrite magnetic ring? A: The inner diameter should fit the outer diameter of your cable with proper clearance for wiring. You can wind the cable through the ring for several turns to achieve better filtering performance if installation space permits.
2. Q: What is the main function of a ferrite magnetic ring? A: It acts as an EMI filter to absorb high‑frequency noise and suppress electromagnetic interference on wires, without affecting normal low‑frequency signal or power transmission.
3. Q: Does higher permeability always mean better filtering effect? A: Not exactly. High‑permeability materials perform well at lower frequency bands, while low‑permeability types work better for high‑frequency noise. Material selection shall match your actual interference frequency.
4. Q: Can one magnetic ring fit all types of cables? A: No. You need to check cable outer diameter, operating frequency and working temperature. Improper size or mismatched material will lead to poor noise‑reduction result.
5. Q: Can ferrite magnetic rings help products pass EMC certification? A: Magnetic rings are one of effective EMC improvement components. Actual test result depends on overall circuit design, wiring layout and other matching measures, not merely the magnetic ring itself.