ESD-R-31SR Kemet

EMI Cores ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case) Overview Applications The KEMET ESD-R-SR Series solid toroidal cores are Consumer electronics designed for use on round cables. KEMETs unique core Air conditioners material enables high performance in low frequency Power conditioners range, at 150 kHz. Options are available in bare, coated Refrigerators and with case types. EMI cores are part of a family of Washing machines passive components which address the issues of noise or Business multifunction printers electromagnetic interference (EMI) in circuits or systems Industrial equipment General purpose inverters Benefits Proprietary high impedance core material for effective noise suppression at 150kHz Solid construction Large-size ring type Bare, coated and with case types available Part Number System ESD- R- 31 SR -P Core Size Series Shape Type Core Material Type Outer Dimension Code (mm) ESD- Ring See Table 1 SR = S15H Blank = Bare SRH = S18H P = Coated One world. One KEMET KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5010 ESD-R-SR 3/31/2020 1 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.comEMI Core ESD-R-SR Toroidal Cores for Round Cables for Low Frequency at 150 kHz (Bare, coated & with case) Turns and Impedance Characteristics Figure 1 How to count turns 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. See Figure 1 for examples of one, two, and three turns. (Representative example: ESD-R-16C) 10,000 Adding turns will result in higher impedance while also lowering Resonance point changes to lower band the effective frequency range. 3T 1,000 2T See Figure 2 for an example. 100 1T 10 1 Core Material and Effective Frequency Range 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 resistance and effective frequency range. The Figure 3 Effective band range of Mn-Zn and Ni-Zn ferrite core material. (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 The Ni-Zn core material is typically effective Ni-Zn series core 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 application. 0.01 0.1 1 10 100 1,000 Frequency (MHz) KEMET Electronics Corporation KEMET Tower One East Broward Boulevard E5010 ESD-R-SR 3/31/2020 2 Fort Lauderdale, FL 33301 USA 954-766-2800 www.kemet.com Impedance () Impedance () Impedance Increase