Multi-layer ferrite inductors from TDK meet NFC resistance levels

Component specialist, TDK, has developed the MLJ-H1005 inductors for use in near field communication (NFC).

The inductors can be used as the LC filters of NFC circuits. The inductors need to have narrow tolerances to minimise the loss caused by mismatched impedance with the antenna, advises TDK. The MLJ-H1005 inductors featuring a tolerance of ±5 per cent to meet this need. Another consideration is to control inductor loss at the 13.56MHz communication frequency, to prevent the reduction of antenna output power. The AC resistance (Rac) must be kept low and maintained even as current is applied, continues TDK. The MLJ-H1005 achieves lower Rac during high current applications than the previous MLJ-W series, through TDK’s low loss material development.

The MLJ-H1005 inductors achieve low AC resistance in high current applications to suppress loss and have the narrow inductance tolerance suppresses loss caused by mismatched impedance with the antenna.

The compact, low profile dimensions of the inductors save space, and high density mounting is possible through the inductors’ low magnetic leakage structure.

The use of NFC circuits is rapidly increasing in smartphones, smartwatches, wearables, and other peripheral devices, as more operations are touchless, including cashless payments, points out TDK.

Full production is scheduled for this month. TDK has already announced that it will expand its line of MLJ series inductors as the touchless society evolves.

TDK was established in 1935 to commercialise ferrite, a key material in electronic and magnetic products. TDK’s comprehensive portfolio features passive components such as ceramic, aluminium electrolytic and film capacitors, as well as magnetics, high frequency, and piezo and protection devices. It also includes sensors and sensor systems such as temperature and pressure, magnetic, and MEMS sensors, power supplies and energy devices and magnetic heads.

The company’s products are marketed under the brands TDK, Epcos, InvenSense, Micronas, Tronics and TDK-Lambda. TDK focuses on demanding markets in automotive, industrial and consumer electronics, and information and communication technology. It has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America.

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