PEMI4QFN/LT,132

Series:	PEMIxQFN
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Low Pass
Filter Order:	2nd
Technology:	RC (Pi)
Number of Channels:	4
Center / Cutoff Frequency:	--
Attenuation Value:	23dB @ 800MHz ~ 3GHz
Resistance - Channel (Ohms):	65
Values:	R = 65 Ohms, C = 23pF (Total)
ESD Protection:	Yes
Operating Temperature:	-40°C ~ 85°C
Applications:	LAN, PCS, WAN
Voltage - Rated:	--
Mounting Type:	Surface Mount
Package / Case:	8-XFDFN
Size / Dimension:	0.067" L x 0.047" W (1.70mm x 1.20mm)
Height:	0.020" (0.50mm)

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Introduction

EMI/RFI filters, also known as LC, RC Networks, refer to a class of electronic components used to block the emission of EMI and RFI interference in a variety of electrical systems. The specific model of these filters is PEMI4QFN/LT,132, which is a type of comb capacitor filter having 4-pins in a QFN package, and is designed with low insertion loss with nominal impedance of 132 Ohm at 1 GHz. In this article, we will discuss its application field as well as working principle.

Application Fields

The PEMI4QFN/LT,132 is typically used in electronic systems for suppressing EMI and RFI interferences. It can be installed to provide a high-resistance shunt path to ground and to minimize the amount of noise being conducted back into the signal line. It is mainly used in the audio, HF, VHF, UHF, cellular, and wireless communications fields, where it is important to prevent any interference between communicating devices. Additionally, it is often used in automotive, transportation, and navigation systems to ensure high safety standards and error-free operation.

Working Principle

The PEMI4QFN/LT,132 features a monolithic filter or a combination of monolithic and discrete components, depending on the application. The primary purpose of this filter is to reduce the amount of RF or electromagnetic noise conducted from the device output to the device input. It works by providing a low-impedance, high-frequency bypass path. The filter is placed between the ground and the signal line, and its purpose is to prevent the interference from traveling back into the signal line. The inductor and capacitor components in the filter serve as high-pass and low-pass filters, respectively. The inductive element in the filter acts as a low-pass filter, blocking out the higher frequencies while allowing the lower frequencies to pass. The capacitive element acts as a high-pass filter, blocking out the lower frequencies while allowing the higher frequencies to pass. In this way, the filter ensures that only the desired frequencies are allowed into the circuit.

Advantages

The PEMI4QFN/LT,132 filter offers many advantages over other types of filters. It is highly effective in reducing the amount of EMI and RFI interference in an electrical system. It also requires very little space, making it ideal for applications where space is limited. Moreover, it is relatively inexpensive compared to other filter types, making it a popular choice for a variety of applications. Additionally, its low insertion loss and good shielding characteristics further enhance its utility.

Conclusion

The PEMI4QFN/LT,132 is a highly efficient EMI/RFI filter with numerous advantages over other filter types. It is an ideal choice for applications in which the goal is to reduce high levels of RF and electromagnetic noise, such as audio, HF, VHF, UHF, and wireless communication systems. Its small physical size makes it well-suited for systems with limited space. Furthermore, its relatively low cost makes it an attractive option for a variety of applications.

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