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a~~=p a~~=p epcos ag 2016. reproduction, publication and dissemination of this publication, enclosures hereto and the information contained therein without epcos? prior express consent is prohibited. epcos ag is a tdk group company. ferrites and accessories e 25/13/7 (ef 25) core and accessories series/type: b66317, b66208 date: june 2016
2 06/16 please read cautions and warnings and important notes at the end of this document. to iec 61246 delivery mode: single units magnetic characteristics (per se t) 6 l / a = 1.1 mm ?1 l e = 57.5 mm a e = 52.5 mm 2 a min = 51.5 mm 2 v e = 3020 mm 3 approx. weight 16 g/set ungapped gapped the a l value in the table applies to a core set comprising one ungapped core (dimension g = 0) and one gapped core (dimension g > 0). calculation factors ( for formulas, see ?e cores: general information? ) material relationship between air gap ? a l value calculation of saturation current k1 (25 c) k2 (25 c) k3 (25 c) k4 (25 c) k3 (100 c) k4 (100 c) n27 90 ?0.731 139 ?0.847 129 ?0.865 n87 90 ?0.731 139 ?0.796 125 ?0.873 validity range: k1, k2: 0.10 mm < s < 2.00 mm k3, k4: 60 nh < a l < 570 nh material a l value nh p e p v w/set ordering code n30 2900 +30/?20% 2530 b66317g0000x130 n27 1750 +30/?20% 1520 < 0.59 (200 mt, 25 khz, 100 c) b66317g0000x127 n87 1850 +30/?20% 1620 < 1.60 (200 mt, 100 khz, 100 c) b66317g0000x187 material g mm a l value approx. nh p e ordering code ** = 27 (n27) ** = 87 (n87) n27, 0.10 r 0.02 489 425 b66317g0100x1** n87 0.16 r 0.02 347 302 b66317g0160x1** 0.25 r 0.02 250 218 b66317g0250x1** 0.50 r 0.05 151 131 b66317g0500x1** 1.00 r 0.05 91 79 b66317g1000x1** b66317 core e 25/13/7 (ef 25)
3 06/16 please read cautions and warnings and important notes at the end of this document. coil former (magnetic axis horizontal or vertical) material: gfr polyterephthalate, ul 94 v-0, insulation class to iec 60085: b66208b, x: f max. operating temperature 155 c, color code black valox 420-se0 ? > e45329 (m) @ , sabic innovative plastic b66208-w: h max. operating temperature 180 c, color code black rynite fr 530 ? > e41938 (m) @ , e i dupont de nemours & co inc solderability: to iec 60068-2-20, test ta, method 1 (aging 3): 235 c, 2 s resistance to soldering heat: to iec 60068-2-20, test tb, method 1b: 350 c, 3.5 s winding: see data book 2013, chapter ?processing notes, 2.1? squared pins. yoke mater ial: stainless spring steel (0.25 mm) coil former ordering code version sections a n mm 2 l n mm a r value p: pins horizontal 1 61 50 28 10 b66208b1110t001 vertical 1 61 50 28 10 b66208x1010t001 b66208w1010t001 yoke (ordering code per piece, 2 are required) b66208a2010x000 horizontal version (b66208b) b66208 accessories e 25/13/7 (ef 25)
4 06/16 please read cautions and warnings and important notes at the end of this document. vertical version (b66208x, b66208w) yoke b66208 accessories e 25/13/7 (ef 25)
5 06/16 please read cautions and warnings and important notes at the end of this document. coil former for smps transformers with line isolation material: gfr polyterephthalate (ul 94 v-0, insulation cla ss to iec 60085: h max. operating temperature 180 c), color code black rynite fr 530 ? > e41938 (m) @ , e i dupont de nemours & co inc solderability: to iec 60068-2-20, test ta, method 1 (aging 3): 235 c, 2 s resistance to soldering heat: to iec 60068-2-20, test tb, method 1b: 350 c, 3.5 s winding: see data book 2013, chapter ?processing notes, 2.1? squared pins. yoke mater ial: nickel silver (0.3 mm) with ground terminal coil former ordering code sections a n mm 2 l n mm a r value p: pins 1 56.9 69.2 41.8 9 b66208l1009t001 yoke (ordering code per piece) B66208A2003X000 b66208a2001x000 coil former yoke B66208A2003X000 b66208a2001x000 b66208 accessories e 25/13/7 (ef 25)
6 06/16 please read cautions and warnings and important notes at the end of this document. mechanical stress and mounting ferrite cores have to meet mechanical requirements during assembling and for a growing number of applications. since ferrites are ceramic materials one has to be aware of the special behavior under mechanical load. as valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing or tensile load. especially high cooling rates under ultrasonic cleaning and high static or cyclic loads can cause cracks or failure of the ferrite cores. for detailed information see data book, chapter ?general - definitions, 8.1? . effects of core combination on a l value stresses in the core affect not only the mechanical but also the magnetic properties. it is apparent that the initial permeability is dependent on the stress state of the core. the higher the stresses are in the core, the lower is the value for the initial permeability. thus the embedding medium should have the greatest possible elasticity. for detailed information see data book, chapter ?general - definitions, 8.1? . heating up ferrites can run hot during operation at higher flux densities and higher frequencies. nizn-materials the magnetic properties of nizn-materials can change irreversible in high magnetic fields. ferrite accessories epcos ferrite accessories have been designed and evaluated only in combination with epcos ferrite cores. epcos explicitly points out that epcos ferr ite accessories or epcos ferrite cores may not be compatible with those of other manufacturers. any such combination requires prior te- sting by the customer and will be at the customer?s own risk. epcos assumes no warranty or reliability for the combination of epcos ferrite accessories with cores and other accessories from any other manufacturer. processing notes ? the start of the winding process should be soft. else the flanges may be destroyed. ? too strong winding forces may blast the flanges or squeeze the tube that the cores can not be mounted any more. ? too long soldering time at high temperature (>300 c) may effect coplanarity or pin arrange- ment. ? not following the processing notes for soldering of the j-leg terminals may cause solderability problems at the transformer because of pollution with sn oxyd of the tin bath or burned insulation of the wire. for detailed information see chapter ?processing notes? , section 8.2. ? the dimensions of the hole arrangement have fixed values and should be understood as a recommendation for drilling the printed circuit board. for dimensioning the pins, the group of holes can only be seen under certain conditions, as they fit into the given hole arrangement. to avoid problems when mounting the transformer, the manufacturing tolerances for positioning the customers? drilling process must be considered by increasing the hole diameter. cautions and warnings ferrites and accessories cautions and warnings
7 06/16 please read cautions and warnings and important notes at the end of this document. display of ordering codes for epcos products the ordering code for one and the same product can be represented differently in data sheets, data books, other publications and the website of epcos, or in order-related documents such as shipping notes, order confirmations and product labels. the varying representations of the ordering codes are due to different processes employed and do not affect the specifications of the respective products . detailed information can be found on the internet under www.epcos.com/orderingcodes.
symbol meaning unit a a e a l a l1 a min a n a r b ' b b ? ' b ? b dc b r b s c 0 cdf df d e a f f cutoff f max f min f r f cu g h h ? h dc h c h h/ p i 2 i i dc i ? j k k 3 k 3c l cross section of coil effective magnetic cross section inductance factor; a l = l/n 2 minimum inductance at defined high saturation ( p a ) minimum core cross section winding cross section resistance factor; a r = r cu /n 2 rms value of magnetic flux density flux density deviation peak value of magnetic flux density peak value of flux density deviation dc magnetic flux density remanent flux density saturation magnetization winding capacitance core distortion factor relative disaccommodation coefficient df = d/ p i disaccommodation coefficient activation energy frequency cut-off frequency upper frequency limit lower frequency limit resonance frequency copper filling factor air gap rms value of magnetic field strength peak value of magnetic field strength dc field strength coercive field strength hysteresis coefficient of material relative hysteresis coefficient rms value of current direct current peak value of current polarization boltzmann constant third harmonic distortion circuit third harmonic distortion inductance mm 2 mm 2 nh nh mm 2 mm 2 p: = 10 ?6 : vs/m 2 , mt vs/m 2 , mt vs/m 2 , mt vs/m 2 , mt vs/m 2 , mt vs/m 2 , mt vs/m 2 , mt f = as/v mm ?4.5 j s ?1 , hz s ?1 , hz s ?1 , hz s ?1 , hz s ?1 , hz mm a/m a/m a/m a/m 10 ?6 cm/a 10 ?6 cm/a a a a vs/m 2 j/k h = vs/a 8 06/16 please read cautions and warnings and important notes at the end of this document. symbols and terms ferrites and accessories symbols and terms
symbol meaning unit ' l/l l 0 l h l p l rev l s l e l n n p cu p trans p v pf q r r cu r h ' r h r i r p r s r th r v s t ' t t c t t v tan g tan g l tan g r tan g e tan g h tan g / p i u ? v e z z n relative inductance change inductance of coil without core main inductance parallel inductance reversible inductance series inductance effective magnetic path length average length of turn number of turns copper (winding) losses transferrable power relative core losses performance factor quality factor (q = z l/ r s = 1/tan g l ) resistance copper (winding) resistance (f = 0) hysteresis loss resistance of a core r h change internal resistance parallel loss resistance of a core series loss resistance of a core thermal resistance effective loss resistance of a core total air gap temperature temperature difference curie temperature time pulse duty factor loss factor loss factor of coil (residual) loss factor at h o 0 relative loss factor hysteresis loss factor relative loss factor of material at h o 0 rms value of voltage peak value of voltage effective magnetic volume complex impedance normalized impedance |z| n = |z| /n 2 u h (l e /a e ) h h h h h h mm mm w w mw/g : : : : : : : k/w : mm c k c s v v mm 3 : : /mm 9 06/16 please read cautions and warnings and important notes at the end of this document. symbols and terms ferrites and accessories
symbol meaning unit d d f d e h r ) k k b k i o s p p 0 p a p app p e p i p p ' p p " p r p rev p s ' p s " p tot u 6 l/a w cu z temperature coefficient (tk) relative temperature coefficient of material temperature coefficient of effective permeability relative permittivity magnetic flux efficiency of a transformer hysteresis material constant hysteresis core constant magnetostriction at saturation magnetization relative complex permeability magnetic field constant relative amplitude permeability relative apparent permeability relative effective permeability relative initial permeability relative real (inductive) component of p (for parallel components) relative imaginary (loss) component of p (for parallel components) relative permeability relative reversible permeability relative real (inductive) component of p (for series components) relative imaginary (loss) component of p (for series components) relative total permeability derived from the static magnetization curve resistivity magnetic form factor dc time constant w cu = l/r cu = a l /a r angular frequency; z = 2 3 f 1/k 1/k 1/k vs mt -1 a ?1 h ?1/2 vs/am : m ?1 mm ?1 s s ?1 10 06/16 please read cautions and warnings and important notes at the end of this document. all dimensions are given in mm. surface-mount device symbols and terms ferrites and accessories
11 06/16 important notes the following applies to all products named in this publication: 1. some parts of this publication contain statements about the suitability of our products for certain areas of application . these statements are based on our knowledge of typical requirements that are often placed on our products in the areas of application concerned. we nevertheless expressly point out that such statements cannot be regarded as binding statements about the suitability of our products for a particular customer application. as a rule, epcos is either unfamiliar with individual customer applications or less familiar with them than the customers themselves. for these reasons, it is always ultimately incumbent on the customer to check and decide whether an epcos product with the properties described in the product specification is suitable for use in a particular customer application. 2. we also point out that in individual cases, a malfunction of electronic components or failure before the end of their usual service life cannot be completely ruled out in the current state of the art, even if they are operated as specified. in customer applications requiring a very high level of operational safety and especially in customer applications in which the malfunction or failure of an electronic component could endanger human life or health (e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suitable design of the customer application or other action taken by the customer (e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by third parties in the event of malfunction or failure of an electronic component. 3. the warnings, cautions and product-specific notes must be observed . 4. in order to satisfy certain technical requirements, some of the products described in this publication may contain substances subject to restrictions in certain jurisdictions (e.g. because they are classed as hazardous) . useful information on this will be found in our material data sheets on the internet (www.epcos.com/material). should you have any more detailed questions, please contact our sales offices. 5. we constantly strive to improve our products. consequently, the products described in this publication may change from time to time . the same is true of the corresponding product specifications. please check therefore to what extent product descriptions and specifications contained in this publication are still applicable before or when you place an order. we also reserve the right to discontinue production and delivery of products . consequently, we cannot guarantee that all products named in this publication will always be available. the aforementioned does not apply in the case of individual agreements deviating from the foregoing for customer-specific products. 6. unless otherwise agreed in individual contracts, all orders are subject to the current version of the ?general terms of delivery for products and services in the electrical industry? published by the german electrical and electronics industry association (zvei) . 7. the trade names epcos, alu-x, ceradiode, ceralink, cerapad, ceraplas, csmp, cssp, ctvs, deltacap, digisimic, dssp, exocore, filtercap, formfit, leaxield, miniblue, minicell, mkd, mkk, motorcap, pcc, phasecap, phasecube, phasemod, phicap, pqsine, siferrit, sifi, sikorel, silvercap, simdad, simic, simid, sineformer, siov, sip5d, sip5k, tfap, thermofuse, windcap are trademarks registered or pending in europe and in other countries. further information will be found on the internet at www.epcos.com/trademarks. important notes

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