In many cases, surface mount bobbins are also available, even though We can choose other types of bobbins with different number of pins. EFD30(12P) means the core is EFD, size is 30mm width and bobbin On the bobbins are shown inside the parenthesis beside the core type. These data are important for designĮngineers to plan the space on the PCB's. These include the maximum heightĪnd width, and pin size and spacing. The criticalĭimensions are shown in the drawings.
In this way, we can deliverįinal products to our customer with the shortest lead time. Try to use one of the core types listed below. Losses when operating at higher flux densities and ambient temperatures,Ī request for custom built transformers using paired cores, we will May have lower losses when frequency increases, while others have lower Most of these manufacturers' product has similar characteristics. Depending on the application and switching frequencies, Such as Magnetics Inc, Epcos, TDK, Tokin, Kawatetsu, Siemens, Philips The ferriteĬore material used in these transformers are industry standard MnZn
#TRANSFORMER BOBBIN SIZE GUIDE PDF#
For small size types, theĤ1 different types of standardized sizes in PDF format that are maintainedĪt CWS' facilities in California, Malaysia, Taiwan or China. Because of lower cost, if the volume is very large, pairedĬore custom transformer is the way to go. Paired core is lower cost and ease in manufacturing, especially for For example, the EFD20's core is shaped likeĪ "EFD" with a size of 20mm in usually the largest dimension.Įvery ferrite manufacturer's EFD20 will have the same dimension, andĬommon third party bobbins can therefore be used. The ferrite industry has adopted some standardizedĬore shapes and sizes. Paired coresĪre available in hundreds of different shapes and sizes, ranging fromĮFD, to PQ to TF.
Have pins for either through hole mount or surface mount. The paired core use a bobbin to put the windings on. Where the switching frequency is below 500 Khz, paired core is usually Transformer is for switch mode power application, or application To purchase over the internet the various types of toroidal core, please
CWS stocks thousands of such toroidal coresįor these RF applications, and we will design and do winding for ourĬustomers with the fastest possible delivery. If a custom transformer is for RF (radio frequency)Īpplication, it is usually designed and built with toroidal core for Are usually built with some standardized ferrite core sizes with or
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