Why do i need a ferrite core

Ferrite bead impedance will change with temperature. Ferrite beads can be quite useful, but only if you understand exactly how they work. Remember that they attenuate signals in a fairly small band, and their effectiveness depends on temperature and load current. In order to best use a ferrite bead, you should make sure it meets your exact specifications. Then, when placing the bead, be sure to take voltage drop and heat into account.

We often discuss the importance and function of ferrite beads. It even has add-ons like the power delivery network, which can help you deal with problems like voltage drop and heat dissipation.

Have more questions about ferrite beads? Call an expert at Altium. Information for EDA Leaders. Mobile menu. Explore Products. Altium Community. More content by Altium Designer. Recent Articles. Should You Use Tight vs. Loose Differential Pair Spacing and Coupling? We get a lot of questions about trace impedance and how to calculate the right trace size to hit a specific impedance in a manufacturable PCB. Just as important as determining an appropriate trace width for a single-ended trace is determination of an appropriate spacing between two traces in a differential pair.

Watch and learn what he will have in store for us. Read Article. Overview of Electrical Stress Test Methods for PCBAs Electrical stress test requirements should be considered as you begin to make a transition to high volume production.

Mark Harris shares his knowledge to streamline processes and maximize efficiencies during product development and production. The Main Advantages when using Draftsman to Create an Assembly Drawing Automation of manufacturing processes has dramatically simplified the fabrication and assembly of electronic products. However, it is almost impossible to assemble a PCB without a drawing. A manufacturer will definitely require an assembly drawing.

Use of a Draftsman document brings an elegant, yet powerful solution when creating the drawings you need for assembly. Draftsman has been designed for creating documentation specifically for PCBs. Its Download PDF. The more accurate and detailed the drawing, the fewer questions your manufacturer will need to ask. Also, it is more likely that the product will fully meet your requirements and expectations. Ferrite core specifications are usually referred to as ferrite core relative permeability values.

Manufacturers will list these values, along with other necessary information in charts provided with the product specification.

This information will include a ferrite core saturation table to help you calculate the ferrite material types and product that you need for your design application.

When working with ferrite bead inductor components, a ferrite bead inductance calculator is used to determine the values necessary to suppress EMIs present in the electronic components of your design. In some applications, EMIs can be suppressed by using a ferrite core transformer design. The transformer itself is constructed by using a magnetic core in which coil inductor windings are made on a ferrite core component. Before designing a transformer, check your requirement and exact application including input voltage, output voltage, current and frequency of operation.

Sleeves and cores are often used on power and control cabling on electronic and electrical devices. Sleeves are usually installed after all cabling has been attached.

For round cabling, a square plastic ferrite sleeve is often used. The core is contained in a hinged plastic casing that opens up to permit the insertion of the cable, then snaps together to secure the ferrite A5 core around the cable to suppress EMIs. Another option is to use a ferrite sleeve suppression cored with a round plastic casing, sized to fit the cable used. Both the square and round cased ferrite cores attenuate any form of EMI emission and are often used either as a retrofit or for testing purposes when calculating ferrite core filter specifications and design requirements.

To begin choosing the correct type of ferrite core, bead, or sleeve you need for your design applications, use the suggested ferrite products in this handy chart. A single circuit protection on a PCB uses a single, two-lead ferrite bead. The figure below shows a ferrite choke on a USB cable. For low-frequency cable emission problems, typically below 10 MHz, ferrite chokes have not been very useful, since their impedance is too low, at these frequencies, to be effective.

My wish finally has been granted. Recently Fair-Rite Products Corp. This material has an impedance peak in the 1 to 2 MHz range. The impedance of ferrite cores can be further increased by using multiple turns. However, this also increases the inter-winding capacitance and degrades the high-frequency performance of the choke. Since the Type 75 material is intended for low-frequency use, this increase in capacitance is less of an issue, and two to five turns can be used with very little, if any, detrimental effect.