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Murata launches the L Cancel Transformer (LCT)

Murata has announced a significant advancement in the realm of electronic components with the launch of the L Cancel Transformer (LCT).

Credit: Murata

This product is the first of its kind and can neutralise the equivalent series inductance (ESL) of a capacitor, optimising its noise-reducing capabilities. Utilising Murata’s ceramic multilayer technology, this solution allows engineers to reduce system noise while decreasing costs and component count.

As the demand for miniaturised and highly functional electronics increases, the issue of electromagnetic noise is becoming increasingly prominent for many industries.

As a noise countermeasure, capacitors are often utilised between the power supply line and ground, but this method is not without its challenges. The noise removal effectiveness of the capacitor is optimal when a capacitor’s impedance is lowest.

However, capacitor impedance can rise due to its ESL, particularly at frequencies beyond the self-resonant frequency, undermining the efficacy of the noise cancellation. To limit this impact, it is common practice to connect numerous capacitors in parallel in order to collectively reduce impedance, at the expense of Bill of Material (BoM) component count and costs.

Murata’s LCT is a new concept capable of resolving the longstanding challenge of managing power supply noise and capacitor component count. Murata’s LCT component is specifically engineered to minimise noise within the frequency range of a few MHz to 1GHz . It achieves this by employing negative mutual inductance to reduce a noise-reducing capacitor’s ESL and therefore increase the effectiveness of its operation, drastically reducing the number of required capacitors.

By using non-magnetic ceramic multilayer technology in its construction, the LCT ensures stable negative inductance and low DC resistance (maximum 55mΩ) even in the presence of current variations and is suitable for a wide range of applications, including consumer, industrial and healthcare products.

Each LCT is suitable for temperatures up to temperatures 125C and since there is no DC superposition characteristic, it can be used with stable negative inductance up to 3A. The surface mount device (SMD) measures just  2.0 x 1.25 x 0.95 mm and is available in tape and reel packing.