Ferrite Core Inductor Software Engineering

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Contents • • • • • Ferrites [ ] Ferrites are ceramic compounds of the with, which are but nonconductive. Ferrites that are used in or contain oxides combined with,, and/or compounds. They have a low and are called \' soft ferrites\' to distinguish them from \' hard ferrites\', which have a high coercivity and are used to make. The low coercivity means the material\'s can easily reverse direction without dissipating much energy (), while the material\'s high prevents in the core, another source of energy loss. The most common soft ferrites are: • Manganese-zinc ferrite ( MnZn, with the formula Mn aZn (1-a)Fe 2O 4). MnZn have higher and than NiZn.

• Nickel-zinc ferrite ( NiZn, with the formula Ni aZn (1-a)Fe 2O 4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz. For applications below 5 MHz, MnZn ferrites are used; above that, NiZn is the usual choice. The exception is with, where the threshold of choice is at 70 MHz. As any given blend has a trade off of maximum usable frequency, versus a higher mu value, within each of these sub-groups manufacturers produce a wide range materials for different applications blended to give either a high initial (low frequency) inductance, or lower inductance and higher maximum frequency, or for interference suppression ferrites, a very wide frequency range, but often with a very high loss factor (low ). It is important to select the right material for the application, as the correct ferrite for a 100 kHz switching supply (high inductance, low loss, low frequency) is quite different to that for an RF transformer or ferrite rod antenna, (high frequency low loss, but lower inductance), and different again from a ferrite (high loss, broadband) Applications [ ] There are two broad applications for ferrite cores which differ in size and frequency of operation: signal transformers, which are of small size and higher frequencies, and power transformers, which are of large size and lower frequencies. Cores can also be classified by shape, such as cores, shell cores or cylindrical cores.

The ferrite cores used for power transformers work in the low frequency range (1 to 200 kHz usually) and are fairly large in size, can be toroidal, shell, or shaped like the letters ‘C’, ‘D’, or ‘E’. They are useful in all kinds of electronic devices – especially power supplies from 1 Watt to 1000 Watts maximum, since more powerful applications are usually out of range of ferritic single core and require grain oriented lamination cores. The ferrite cores used for signals have a range of applications from 1 kHz to many MHz, perhaps as much as 300 MHz, and have found their main application in electronics, such as in and tags. Ferrite rod aerial [ ].

Loopstick antenna from an AM radio having two windings, one for and one for (AM broadcast) reception. Typically 10 cm long, these loop antennas are usually hidden inside the radio receiver. Ferrite rod aerials (or antennas) are a type of ( SML) antenna very common in, although they began to be used in (\'valve\') radios in the 1950s. They are also useful in (VLF) receivers, and can sometimes give good results over most of the shortwave frequencies (assuming a suitable ferrite is used). They consist of a coil of wire wound around a ferrite rod core (usually several inches longer than the coil, but sometimes over 3 feet long ). This core effectively ‘concentrates’ the magnetic field of the radio waves to give a stronger signal than could be obtained by an air core loop antenna of comparable size, although still not as strong as the signal that could be obtained with a good outdoor wire aerial.

Find or Design Your Ferrite Chip Inductor. Using Laird-manufactured parts, our team of global experts and engineers create a custom design experience that is unrivaled by our competitors. Explore our robust line of products or contact an engineer through customer service to discuss your next solution.

Contents • • • • • Ferrites [ ] Ferrites are ceramic compounds of the with, which are but nonconductive. Ferrites that are used in or contain oxides combined with,, and/or compounds. They have a low and are called \' soft ferrites\' to distinguish them from \' hard ferrites\', which have a high coercivity and are used to make. The low coercivity means the material\'s can easily reverse direction without dissipating much energy (), while the material\'s high prevents in the core, another source of energy loss. The most common soft ferrites are: • Manganese-zinc ferrite ( MnZn, with the formula Mn aZn (1-a)Fe 2O 4). MnZn have higher and than NiZn.

• Nickel-zinc ferrite ( NiZn, with the formula Ni aZn (1-a)Fe 2O 4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz. For applications below 5 MHz, MnZn ferrites are used; above that, NiZn is the usual choice. The exception is with, where the threshold of choice is at 70 MHz. As any given blend has a trade off of maximum usable frequency, versus a higher mu value, within each of these sub-groups manufacturers produce a wide range materials for different applications blended to give either a high initial (low frequency) inductance, or lower inductance and higher maximum frequency, or for interference suppression ferrites, a very wide frequency range, but often with a very high loss factor (low ). It is important to select the right material for the application, as the correct ferrite for a 100 kHz switching supply (high inductance, low loss, low frequency) is quite different to that for an RF transformer or ferrite rod antenna, (high frequency low loss, but lower inductance), and different again from a ferrite (high loss, broadband) Applications [ ] There are two broad applications for ferrite cores which differ in size and frequency of operation: signal transformers, which are of small size and higher frequencies, and power transformers, which are of large size and lower frequencies. Cores can also be classified by shape, such as cores, shell cores or cylindrical cores.

The ferrite cores used for power transformers work in the low frequency range (1 to 200 kHz usually) and are fairly large in size, can be toroidal, shell, or shaped like the letters ‘C’, ‘D’, or ‘E’. They are useful in all kinds of electronic devices – especially power supplies from 1 Watt to 1000 Watts maximum, since more powerful applications are usually out of range of ferritic single core and require grain oriented lamination cores. The ferrite cores used for signals have a range of applications from 1 kHz to many MHz, perhaps as much as 300 MHz, and have found their main application in electronics, such as in and tags. Ferrite rod aerial [ ].

Loopstick antenna from an AM radio having two windings, one for and one for (AM broadcast) reception. Typically 10 cm long, these loop antennas are usually hidden inside the radio receiver. Ferrite rod aerials (or antennas) are a type of ( SML) antenna very common in, although they began to be used in (\'valve\') radios in the 1950s. They are also useful in (VLF) receivers, and can sometimes give good results over most of the shortwave frequencies (assuming a suitable ferrite is used). They consist of a coil of wire wound around a ferrite rod core (usually several inches longer than the coil, but sometimes over 3 feet long ). This core effectively ‘concentrates’ the magnetic field of the radio waves to give a stronger signal than could be obtained by an air core loop antenna of comparable size, although still not as strong as the signal that could be obtained with a good outdoor wire aerial.