EMI Cores ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case) Overview Applications The KEMET ESD-R-B series solid toroidal cores are Consumer electronics d esi g n e d to us e o n r o u n d c a b l es. T h e w i d e r a n g e of Air conditioners Ma n ga n es e Z i n c ( M n Z n) a n d N i c ke l Z i n c ( N i Z n) o p ti o ns Power conditioners all ows fo r t a r g e ti n g of s p e c i fi c fr e q u e n c y r a n g es. T h e R efr ige r a tors s nail - s ha p e d c as e all ows fi x i n g th e c o r e i n th e a p p li c a ti o n Was hi n g ma c hi n es to avoid contact with other components. I n d us tr ial e q u i p m e n t M e di c al e q u i p m e n t E M I c o r es a r e pa r t of a fa mil y of pas si ve c o m p o n e n t s w hi c h a d d r es s th e is su es of n ois e o r e l e c tr o ma g n e ti c i n te r fe r e n c e ( E M I ) i n c i r c u i t s o r sys te ms. Benefits M n Z n 10 M Hz (A M ba n d r a n g e) a n d N i Z n 3 0 0 M Hz ( F M ba n d r a n g e) o p ti o ns availa b l e Solid construction Easy to install with one M4 screw U L9 4 V2 fla m e r e t a r da n t r a te d c ase One world. One KEMET KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5002 ESD-R-B 3/30/2020 1 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.comEMI Core ESD-R-B Toroidal Cores for Round Cables for Low & High Frequency (with snail-shaped case) Part Number System ESD- R- 19 B C o r e S i z e Series Shape Type Core Material O u t e r D i m e n s i o n C o d e (m m) ESD- R in g S e e Ta b l e 1 B = Mn-Zn D - B = N i -Z n Figure 1 How to count turns Turns and Impedance Characteristics W h e n th e d esi r e d p e r fo r ma n c e of a n E M I c o r e c a n n o t b e o b t ai n e d w i th a si n g l e pas s th r o u g h th e c o r e , th e i m p e da n c e c ha r a c te r is ti c s c a n b e c ha n g e d w i th m u l ti p l e t u r ns. A t u r n is c o u n te d by th e n u m b e r of l ea d - w i r e w i n di n gs w hi c h pas s 1T 2T 3T th r o u g h th e i n n e r h o l e of th e c o r e . W i n di n gs o n th e o u t si d e of th e core do not count. Figure 2 Relationship between impedance and turn count. (Representative example: ESD-R-16C) S e e F i g u r e 1 fo r e xa m p l es of o n e , t wo , a n d th r e e t u r ns. 10,000 Resonance point changes to lower band A d di n g t u r ns w ill r esu l t i n hi g h e r i m p e da n c e w hil e als o l owe r i n g 1,000 3T th e e f fe c ti ve f r e q u e n c y r a n g e . 2T 100 S e e F i g u r e 2 fo r a n e xa m p l e . 1T 10 Core Material and Effective Frequency Range 1 1 10 100 1,000 Frequency (MHz) T h e r e a r e t wo fe r r i te ma te r ial o p ti o ns fo r K E M E T E M I C o r es: N i c ke l Z i n c ( N i -Z n) a n d Ma n ga n ese Z i n c ( M n -Z n). E a c h c o r e ma te r ial has a dif fe r e n t Figure 3 Effective band range of Mn-Zn and Ni-Zn ferrite core material. r esis t a n c e a n d e f fe c ti ve f r e q u e n c y r a n g e . T h e (Representative example, measured with same-dimension ring core) MnZn core material has a lower resistance 1,000 c o m pa r e d to th e N i -Z n th e r e fo r e , a d e q ua te i nsu la ti o n is r e q u i r e d b e fo r e use . AM band range FM band range Ni-Zn series core T h e N i -Z n c o r e ma te r ial is t y p i c all y e f fe c ti ve 100 fo r f r e q u e n c ies i n th e M Hz ba n d r a n g e su c h as Mn-Zn series core th e F M - ba n d , w hil e th e M n -Z n c o r e ma te r ial is t y p i c all y e f fe c ti ve fo r th e k Hz ba n d r a n g e su c h as 10 th e A M - ba n d. S e e F i g u r e 3. It is recommended to measure the actual fr e q u e n c y r a n g e e f fe c ti ve n es s i n th e t a r g e t 1 0.01 0.1 1 10 100 1,000 application. Frequency (MHz) KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5002 ESD-R-B 3/30/2020 2 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.com Impedance () Impedance () Impedance Increase