Do you know how to distinguish between laminated inductors and wirewound inductors?

December 06, 2022

Inductors according to the structure of the main way: laminated inductors and wirewound inductors SMD laminated inductors, ferrite internal production of multi-layer spiral wire laminated inductors, is packaged inside the ferrite multi-layer lines, multi-layer lines form the coil. Laminated inductors are small in size, commonly used materials can be as small as 0201 size, and cheap, suitable for small volume and not demanding scenarios. The main reason for the low requirements is the general accuracy of the laminated inductor, the low Q value, and the small current through the general filtering and RF matching. Laminated inductors look similar to chip capacitors and resistors, with pads at both ends and a gray or white rectangular body in the middle, with no coil visible.

What are the three types of common wirewound inductors?

1. Enameled wire wrapped around the outside of the magnetic core

2. Ultra-small chip wirewound inductors

3, closed wirewound inductors (gray and white squares) wirewound inductors, which are wound around the core with many turns of wire. This process is more complex than laminated inductors, so the smallest SMD wirewound inductor commonly used is the 0402 package. Small size wirewound inductors are usually used in RF circuits, combined with capacitors to form filters or matching networks. In order to facilitate SMT production when sucked by the nozzle, SMD wirewound inductors need to add a flat cover, the cover is generally colored. Most of the blue, but also red and yellow, a glance at the past and different inductors obviously different. The same size SMD wirewound inductor is nearly 10 times more expensive than a laminated inductor, but the Q-value is much better. Large size wirewound inductors are generally used as energy storage devices for boost or buck. It is also a coil around a core, but the wire is much thicker and is used to pass large currents. Because of the large inductance, high Q value, and high current, the size is also quite large.

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