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What is the difference between a shielded chip inductor and a chip inductor?
Apr 07, 2017


What is the difference between a shielded chip inductor and a chip inductor?


Shielded SMD inductors have more than one shield cap compared to SMD inductors. The effects of the two are not the same in the same circuit. What are the differences?


Shielded SMD inductors are not the same as the general SMD inductors. The general SMD inductors are not shielded in the circuit, and the inductance in the circuit does not achieve the desired effect.

68uH shielded chip inductor.png

The shielded chip inductor can shield the instability of the current in some circuits and play a good role in blocking. The shielded inductor complete metal shield will be surrounded by a positive electrical conductor and will be induced and charged inside the shield. The conductor has the same amount of negative charge, and the outer side has the same amount of positive charge as the charged conductor.

If the metal shield is grounded, the positive charges on the outside will flow into the earth, and no electric field will exist on the outside. That is, the electric field with a positive electrical conductor is shielded in the metal shield.


The shielded inductor also plays a role of coupling in the circuit. The shielded chip inductor reduces the coupling interference voltage of the alternating electric field to the sensitive circuit. The inductor can be provided with a conductive metal shield between the interference source and the sensitive circuit. The metal shield is grounded.

The coupling interference voltage of the alternating electric field to the sensitive circuit depends on the product of the alternating electric field voltage, the coupling capacitance, and the metal shield grounding resistance. As long as the metal shield is tried to be well grounded, the coupling interference voltage of the alternating electric field to the sensitive circuit can be made very small. The electric field shielding is mainly based on reflection, so the thickness of the shielding body does not have to be too large, and the structural strength is the main consideration.


The above is where the shielding patch inductance is not the same as the patch inductance


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