New Industry Products

AECQ-200 SMT Inductors for SMPS up to 300W Support 95% Efficiency

January 21, 2019 by Scott McMahan

Würth Electronik extended its family of WE-PD SMT power inductors. According to the company, the new AECQ-200 qualified power inductors feature the highest possible saturation current based on Ferrite. The devices also offer ultra-low RDC and RAC. The inductors are suitable for switching frequency up to 10MHz. The inductors can operate temperatures from -40°C to +125°C or to +150°C  depending on the model. The temperature dependent parameter is available on Redexpert.

Wurth says that like the company's other WE-PD series inductors, the new devices have low loss material and boast tight tolerances and high saturation behavior compared to other manufacturers in the market. A plastic base enhances the mechanical stability and efficiency, and the MnZn core is said to improve Saturation and RDC for highest efficiency.

Potential applications for the new inductors include switch mode power supplies from .1W up to 300W including those with extremely high efficiency of greater than 95%. The inductors can also be integrated into dc-dc converters.

The inductance (L) of the devices ranges from 1mH to 100mH. The IR ranges from 3.5A down to .65A. The ISAT is from 4.5A down to .5A. The typical resistance (Rdc) is from 31mW up to 950mW. Whereas the maximum resistance (Rdc) ranges from 39mW to 1060mW. The frequency of the inductors is from 192MHz down to 11MHz.

Design Notes

  • The ambient temperature while operating the WE-PDseries of storage chokes at full current rating load should generally range from -40 °C to +85 °C.
  • The self-heating of the component must be taken into account at higher ambient temperatures to ensure that the permissible solder joint temperature is not exceeded or the wire insulation damaged.
  • The wire used can withstand a temperature of up to +150 °C.
  • The ferrite core itself may be used over a far greater temperature range (approx. -50 °C to +250 °C (curie temperature))
  • However, in this case, the tolerance limits of the inductor may be exceeded due to the temperature dependence of permeability.