Multi-layer inductors meet automotive PoC demands, says TDK

Multi-layer inductors intended for use in automotive power over coax (PoC) implementations make up the MLJ1608WG series by TDK. The compact components achieve a maximum impedance of 2500 Ohm. They also retain impedance levels of 1,000 Ohm over a 300 MHz to 2GHz frequency range. 

Impedance characteristics of conventional multi-layer inductors vary depending on the current applied and cannot secure sufficient impedance. According to TDK, the MLJ1608WG inductors offer less current variation. For example, a 500mA current is supported despite the small dimensions of 1.6 x 0.8 x 0.8mm. According to TDK, this significantly reduces variation in impedance during current application. 

The multi-layer inductors can be operated at temperatures of up to 125 degrees C with a current of 400mA.

Applications like advanced driver assistance systems (ADAS) are increasing the demands for higher speed and larger capacity interfaces. Automotive camera systems using LVDS transmission are adopting PoC which superimposes data and power supply onto a single coaxial cable.

PoC reduces the number of wire harnesses required by transmitting data and supplying power. This contributes to reducing the vehicle’s weight and to realise space savings. Effective filtering is needed to separate data from the power supply in a PoC circuit. This will generally consist of two to four inductors. Inductors used in such filters must have high impedance for AC components from low right through to high frequencies. Achieving impedance values of 1,000 Ohm or higher over a broad range of frequencies ensures the MLJ1608WG series is optimised to meet these requirements, confirmed TDK.

TDK was established in 1935 to commercialise ferrite, a key material in electronic and magnetic products. TDK‘s portfolio features passive components such as ceramic, aluminium electrolytic and film capacitors, as well as magnetics, high-frequency, and piezo and protection devices. The product spectrum also includes sensors and sensor systems such as temperature and pressure, magnetic and MEMS sensors. In addition, TDK provides power supplies and energy devices and magnetic heads. The products are marketed under the product 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. TDK has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America.

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