EMI Cores ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case) Overview Applications The KEMET ESD-R-H Series solid toroidal cores feature Automotive inverters high heat resistance for round cables. KEMETs unique Automotive chargers core material enables high performance in low frequency Automotive DC/DC converters range with the Manganese Zinc (MnZn) solution and in Consumer electronics high frequency range with the Nickel Zinc (NiZn) option. A Air conditioners c o m m o n val u e is als o s p e c i fi c all y d esi g n e d w i th a c a b l e Power conditioners holding mechanism for round cable in higher Refrigerators heat environment. Washing machines Industrial equipment EMI cores are part of a family of passive components which General purpose inverters address the issues of noise or electromagnetic interference Robots (EMI) in circuits or systems. Information and communication devices Medical equipment Audio-visual equipment Benefits Proprietary core material for high performnace in low and high frequency range Solid construction W i d e r o p e r a ti n g te m p e r a t u r e r a n g e f r o m 4 0C to +12 0C U L9 4 V0 fla m e r e t a r da n t r a te d c ase C a b l e h o l di n g m e c ha nis m fo r fi x i n g c a b l es w i th ba n ds a n d installation with two M4 screws One world. One KEMET KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5003 ESD-R-H 3/30/2020 1 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.comEMI Core ESD-R-H Toroidal Cores for Round Cables for Low & High Frequency & High Heat Resistance (with case) Part Number System ESD- R- 12 M-H Core Size Series Shape Type Core Material Outer Dimension Code (mm) ESD- Ring See Table 1 H / M-H = Mn-Zn N-H = Ni-Zn Figure 1 How to count turns Turns and Impedance Characteristics When the desired performance of an EMI core cannot be obtained with a single pass through the core, the impedance characteristics can be changed with multiple turns. A turn is counted by the number of lead-wire windings which pass 1T 2T 3T through the inner hole of the core. Windings on the outside of the 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 Adding turns will result in higher impedance while also lowering 1,000 3T the effective frequency range. 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) There are two ferrite material options for KEMET EMI Cores: Nickel Zinc (Ni-Zn) and Manganese Zinc (Mn-Zn). Each core material has a different Figure 3 Effective band range of Mn-Zn and Ni-Zn ferrite core material. resistance and effective frequency range. The (Representative example, measured with same-dimension ring core) MnZn core material has a lower resistance 1,000 compared to the Ni-Zn therefore, adequate insulation is required before use. AM band range FM band range Ni-Zn series core The Ni-Zn core material is typically effective 100 for frequencies in the MHz band range such as Mn-Zn series core the FM-band, while the Mn-Zn core material is typically effective for the kHz band range such as 10 the AM-band. See Figure 3. It is recommended to measure the actual frequency range effectiveness in the target 1 0.01 0.1 1 10 100 1,000 application. Frequency (MHz) KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5003 ESD-R-H 3/30/2020 2 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.com Impedance () Impedance () Impedance Increase