TDK adds resin layers for low resistance MLCCs

TDK has refined the design of multilayer ceramic capacitors (MLCCs) with low-resistance soft termination types and resin layers which cover only a board mounting side.

The result, said TDK, is high reliability and low resistance. They CN series of MLCCs have a large capacitance up to 22 microF in the 3216 size (measuring 3.2 x 1.6 x 1.6mm) and 47 microF in 3225 sizes (measuring 3.2 x 2.5 x 2.5mm).

Standard terminal electrodes have a two-layer plating structure with the base electrodes Cu and Ni-Sn, while soft termination has a conductive resin applied between the two layers of plating with the base electrodes Cu and Ni-Sn.

MLCCs with soft termination prevent short circuits in power and battery lines but soft termination has a slightly higher terminal electrode resistance, therefore it is necessary to keep the resistance low to reduce loss.

Unlike conventional soft termination MLCCs with the entire terminal electrodes covered with resin layers, the new design features resin layers covering only a board mounting side. This allows electric current to pass outside the layers, reducing electrical resistance. The soft termination product using this structure is believed to be the first in the industry. The low-resistance soft termination translates to higher capacitances than conventional products, helping to reduce the number of parts and size required, said TDK.

TDK has also added CNA series (automotive grade) and CNC series (commercial grade) products. Models in the automotive grade CNA series are AEC-Q200 compliant.

Mass production will commence in September 2023 and will join TDK’s current offering of CN series MLCCs.

The MLCCs are designed for smoothing and decoupling power lines for automotive electronic control units (ECU) and industrial robots.

TDK was established in 1935 to commercialise ferrite, a key material in electronic and magnetic products. Its portfolio features passive components such as ceramic, aluminum electrolytic and film capacitors, as well as magnetics, high-frequency, and piezo and protection devices and includes sensors and sensor systems such as temperature and pressure, magnetic, and MEMS sensors. 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. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America.

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