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Choosing the Right Ferrite_ Comparing Core Materials-converted

In good designs, supply voltages or ground leads are in the range of 1 to 10u03a9;<br>usable signal lines are between 50 and 100u03a9 and greater, depending on the<br>application (e.g., bus systems such as CAN, SCSI etc.).<br>Based on the nomogram, you may discover the desired ferrite impedance (ZF)<br>starting with this transfer impedance (ZA or ZB) and the desired interference<br>suppression. Knowing the ferrite's impedance, you can find the right ferrite for<br>the job, such as a ferrite sleeve or an SMD ferrite.

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Choosing the Right Ferrite_ Comparing Core Materials-converted

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  1. Choosing the Right Ferrite: Comparing Core Materials

  2. Ferrite Cores www.cosmoferrites.com

  3. Overview Only an EMC laboratory measurement can confirm that the ferrite is absolutely accurate. In most cases, calculating the dynamic impedance (transfer impedance) of an electronic circuit in the highest frequency range is not practical. This is dependent on a number of variables that are difficult to quantify mathematically, particularly in the HF range. However, an initial selection might be made based on experience and comparable measurements. www.cosmoferrites.com

  4. How to Choose the Right Ferrite? In good designs, supply voltages or ground leads are in the range of 1 to 10Ω; usable signal lines are between 50 and 100Ω and greater, depending on the application (e.g., bus systems such as CAN, SCSI etc.). Based on the nomogram, you may discover the desired ferrite impedance (ZF) starting with this transfer impedance (ZA or ZB) and the desired interference suppression. Knowing the ferrite's impedance, you can find the right ferrite for the job, such as a ferrite sleeve or an SMD ferrite. Wurth Electronics provides a Component Selector, a free software program that allows you to quickly and simply select SMD ferrites and other components, as well as simulate some of their functions. www.cosmoferrites.com

  5. Comparison of Ferrite Core Materials Because of the frequency-dependent loss components, it's only practical to use the core materials for inductors within a specific frequency range. Beyond a typical frequency limit, core losses increase dramatically. The core material can be used as a filter element in this case. Conclusions: Iron powder materials (Fe): can be employed as a pure inductor up to 400 kHz; beyond that, the loss component dominates in R, which is present up to 10 MHz (more, depending on the core material). In the frequency range commencing about 20MHz and higher, the core is no longer effective. www.cosmoferrites.com

  6. Continued.. Manganese-zinc cores (MnZn) are inductive between 20 and 30 MHz. In the frequency range starting at 10MHz, increasing losses must be expected. The core material is no longer effective in the frequency band commencing about 80MHz. Nickel-zinc cores (NiZn) are inductive up to 60MHz, but the core material becomes lossy above that, up to 1GHz and beyond. ● ● This qualitative analysis proves why nickel-zinc ferrites, in particular, have become well-established in the EMC range. It is the fundamental substance that acts as a filter over the broadest and most significant frequency range. MnZn ferrites have recently been used to decrease cable interference in the 150kHz to 30MHz range. The STAR-FIX LFS snap ferrites and the WE-AFB LFS ferrite sleeves are available from Wurth Electronics. www.cosmoferrites.com

  7. Thank you If you need more assistance, you can feel free to connect with our experts who will take you through our wide range of ferrite products available for several applications. Contact us @cosmo ferrites ltd www.cosmoferrites.com

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