Components that prevent the negative effect of electromagnetic waves on electronic devices
EMI/RFI (electromagnetic interference/radio frequency interference) components are filters designed for signal/power line applications to pass a defined band and reject undesired emissions. Such filters usually contain series-inductive and parallel-capacitive components that provide a low-impedance path for noise around the protected circuit. Octopart is a great place to start your search for EMI components, RF Devices and other electronic parts.

ECMF2-40A100N6
EMI Filter 0.25pF 21dB 100mA Solder Surface Mount 6-Pin uQFN T/R

ECMF02-4CMX8
ECMF02 Series 1 mA 4 Ohm USB 2.0 ESD Protection Common Mode Filter - UQFN-8

BLM18SG121TN1D
Ferrite Beads Multi-Layer 120Ohm 25% 100MHz 3A 0.025Ohm DCR 0603 T/R

BLM18PG121SN1D
Ferrite Beads Multi-Layer 120Ohm 25% 100MHz 2A 50mOhm DCR 0603 Paper T/R

BLM21PG221SN1D
Ferrite Beads Multi-Layer 220Ohm 25% 100MHz 2A 45mOhm DCR 0805 Paper T/R

BLM18AG601SN1D
Ferrite Beads Multi-Layer 600Ohm 25% 100MHz 500mA 380mOhm DCR 0603 Automotive Paper T/R

BLM18AG102SN1D
Ferrite Beads Multi-Layer 1KOhm 25% 100MHz 400mA 500mOhm DCR 0603 T/R

BNX026H01L
Power Line Filter, Amusement Equipment, Displays, Digital AV Equipment, PC Peripheral Equipment

ACP3225-102-2P-T000
ACP Series 1210 1000 Ohm 1.2 A 0.10 Ohm DCR 50 V SMT Common Mode Filter

MCZ1210AH900L2TA0G
Choke, Common Mode, 140 nH, 90 Ohm, 100 mA, 0504 [1210 Metric]

NFE31PT222Z1E9L
NFE Series 1206 2200 pF 6 A 25 V SMT LC Combined Type EMI Filter

BLM15AG121SN1D
Ferrite Beads Multi-Layer 120Ohm 25% 100MHz 550mA 190mOhm DCR 0402 Paper T/R