SDR0403-331KL Inductors, Coils, Chokes

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Fixed inductors are important passive electronic components that are used to introduce a modified impedance into a circuit. In this article, the SDR0403-331KL will be discussed in terms of its application field and working principle.

The SDR0403-331KL is part of Sumida CRM series. It is a very compact and low-profile surface mounted inductor which is applicable in the narrow space design in the consumer electronics. It is RF choke-type, and available in wide range of inductance values from 31nH to 3.3mH. The specified inductance concern is 20%, which is applicable under -25℃ to +85℃. It is tested at 1KHz 0.3V and has low losses.

As for application field, SDR0403-331KL is applicable for power lines and in parallel with resonance, and is well-matched in low-voltage switching power supply, etc. The low-profile and compact inductor is also applicable in hand-held device and IoT, which require small footprint.

To understand its working principle, it is useful to know the definition of inductance first. Inductance is the quantity of a circuit element that opposition to a change of electric current. A simple analogy is a rubber tube. If one tries to squeeze the tube, it opposes the motion. In other words, it stores energy in a magnetic field in response to the current.

The SDR0403-331KL has a two-pin planar core structure with a ferrite coil. It contains a soft ferrite that has higher permeability than the standard iron powder core, which enables better AC characteristics and can reduce power loss at higher frequencies. The coils is a composite type which is processed to prevent variations in inductance due to the differences in DC bias characteristics.

The SDR0403-331KL works by producing a magnetic field around the desired lead wires. The permeability of the core material, steel or ferrite, determines the magnetic field strength and the number of turns on the coil determines the inductance. The two-pin planar core structure and ferrite coil support improve accuracy in design, reduce power loss at higher frequencies, and can deliver various inductance values in a small size.

In conclusion, the SDR0403-331KL is a very compact and low-profile surface mounted RF choke-type inductor that is applicable in the narrow space design in the consumer electronics. Its application field covers power lines and low-voltage switching power supply, and its two-pin planar core structure and ferrite coil support improve accuracy in design. Its working principle is based on the production of a magnetic field around the desired lead wires.

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