PEMI2QFN/HE,115 Filters

Resistance - Channel (Ohms):	45
Height:	0.020" (0.50mm)
Size / Dimension:	0.057" L x 0.039" W (1.45mm x 1.00mm)
Package / Case:	6-XFDFN
Mounting Type:	Surface Mount
Voltage - Rated:	--
Applications:	LAN, PCS, WAN
Operating Temperature:	-40°C ~ 85°C
ESD Protection:	Yes
Values:	R = 45 Ohms, C = 8.5pF (Total)
Series:	PEMIxQFN
Attenuation Value:	9dB @ 800MHz ~ 3GHz
Center / Cutoff Frequency:	--
Number of Channels:	2
Technology:	RC (Pi)
Filter Order:	2nd
Type:	Low Pass
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to EMI/RFI Filters (LC, RC Networks)

Electromagnetic interference and radio frequency interference (EMI/RFI) is a type of electromagnetic radiation that can cause interference with communication, data exchange, and other electronic equipment. This interference can be conducted or radiated with significant levels of energy, and in some cases, the interference can travel long distances and cause very damaging effects. To reduce or eliminate this interference, EMI/RFI filters are employed.

Types of EMI/RFI Filters

EMI/RFI filters can be broadly classified into two types, active and passive. Active filters employ amplifying components such as transistors or operational amplifiers, whereas passive filters rely solely on the characteristics of the electronic components used, such as capacitors and inductors.Active filters can be further divided into two classes: linear and non-linear. Linear filters are designed to reduce or eliminate the levels of interference by suppressing the frequency of the interference before it enters the device, while non-linear filters can either attenuate certain frequencies or introduce distortion in the signal.The most common type of passive filter used for EMI/RFI suppression is the LC, or inductor-capacitor network. This type of filter utilizes filter networks consisting of one or more inductors and capacitors to reduce the levels of the interfering signal.

PEMI2QFN/HE, 115 Application Field and Working Principle

The PEMI2QFN/HE Series 115 from Murata Electronics is a passive LC, or inductor-capacitor, filter designed to reduce EMI/RFI interference. This filter is rated to operate at temperatures ranging from -20°C to 85°C.The PEMI2QFN/HE Series 115 is designed to be used in a wide variety of applications including data processing, storage, and networking. This filter is perfect for systems where the EMI/RFI interference needs to be reduced but the space and power limitations must be considered.The PEMI2QFN/HE Series 115 filter functions by providing a low-impedance path to ground for unwanted signals. This path is provided by the inductors in the filter network. The capacitors are then used to shunt the interfering signals to ground. The filter network will attenuate the unwanted signals, thus reducing the levels of EMI/RFI interference.

Conclusion

The PEMI2QFN/HE Series 115 from Murata Electronics is an efficient and economical solution for EMI/RFI suppression. This filter provides a low-impedance path to ground for unwanted signals and can be used in a variety of applications. The filter can also operate at temperatures ranging from -20°C to 85°C. This makes it an ideal solution for systems where EMI/RFI interference needs to be reduced but space and power limitations must still be taken into consideration.

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