New Industry Products

TDK offers compact, current-compensated ring core chokes

March 25, 2021 by Hailey Stewart

This article highlights series of current-compensated EPCOS double-ring core chokes for the suppression of common-mode interferences.

TDK Corporation presents a new series of current-compensated EPCOS double-ring core chokes for the suppression of common-mode interferences. These chokes are available in three sizes with current handling capacities between 10 A and 17 A, and with a rated voltage of 250 V AC (50/60 Hz). Depending on the type, the inductance value is between 1.0 mH and 6.25 mH. The plastic material of the base plate and spacer in the middle of the ring core conforms with UL 94 V-0, and the highest CTI value of >600. In order to meet the high requirements for specific applications in domestic appliances, in accordance with IEC 60335-2-xx, the plastic meets specifications for GWIT (+775 °C), GWFI (850 °C) and Ball Pressure (+190 °C), as well as CTI >250. These high requirements are increasingly found in industrial applications, such as drives.


Image courtesy of TDK

Image courtesy of TDK


These EMC components offer extremely small dimensions in relation to the current capacity with dimensions of between 33 x 23 x 30 mm and 39 x 23 x 37 mm. Due to the leakage inductance of around 0.4%, the RoHS-compatible ring core chokes also suppress symmetrical interferences. The main areas of application are switch-mode power supplies, converters and domestic appliances.


Main fields of application

  • Switch-mode power supplies, converters and domestic appliances


Main features and benefits

  • Higher insulation requirements according to IEC EN 60335-1/2 standards
  • Current handling capacity of 10 A to 17 A at 250 V AC
  • Compact dimensions of 33 x 23 x 30 mm to 39 x 23 x 37 mm 
  • Suppression of symmetrical interferences due to leakage inductance of 0.4%


About TDK

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize 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. 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, magnetic heads and more. These products are marketed under the product brands TDK, EPCOS, InvenSense, Micronas, Tronics and TDK-Lambda. TDK focuses on demanding markets in the areas of information and communication technology and automotive, industrial and consumer electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2019, TDK posted total sales of USD 12.5 billion and employed about 105,000 people worldwide.