A-3-3099-1 is a Plugin Color Ring Inductors/Through Hole Inductors ROHS manufactured by Zeng Yi. It is a small, cylindrical electrical component used to store energy in a magnetic field. This inductor is mainly made of a copper wire wound around a cylindrical ferromagnetic core. It has a 3mm diameter, a 30mm height, and a 9.1 ohm inductance rating. It has a color-coded ring for identification and is RoHS compliant. The inductor is suitable for use in a wide range of applications, including switching power supplies, DC/DC converters, LED drivers, and communication systems. It has excellent heat resistance and high moisture resistance, and is UL recognized.