Current:	1.5A
Height:	0.108" (2.75mm)
Size / Dimension:	0.071" Dia x 0.126" L (1.80mm x 3.20mm)
Package / Case:	1210 (3225 Metric), 3 PC Pad
Mounting Type:	Surface Mount
Voltage - Rated:	20V
Applications:	General Purpose
Operating Temperature:	-40°C ~ 125°C
ESD Protection:	No
Values:	--
Series:	ACH
Resistance - Channel (Ohms):	0.06
Attenuation Value:	25dB @ 170MHz ~ 250MHz
Center / Cutoff Frequency:	--
Number of Channels:	1
Technology:	LC (T-Type)
Filter Order:	3rd
Type:	Low Pass
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction to EMI/RFI Filters

EMI/RFI filters, also known as LC, RC networks, are electric circuit components that provide a signal filtering effect on the protection of electronic systems. This type of filter can be used to reduce the frequency of electromagnetic interference, or EMI, which are the power or communication signals on a specific frequency that have escaped or "leaked" from a source and/or are acting on other electronic equipment in the same area. The main purpose of these filters is to reduce the amount of radiation in the environment created by these unwanted signals.

Types of EMI/RFI filters

EMI/RFI filters come in many shapes and sizes. They can be divided into two types of filters: active filters and passive filters. Active filters contain elements such as resistors, capacitors, and inductors that can be adjusted to block or pass certain frequencies while attenuating others. Passive filters, on the other hand, are simpler in design, and they mainly rely on line impedance and capacitance to reduce EMI levels.

The ACH3218-221-TD01 EMI/RFI Filter

The ACH3218-221-TD01 is a passive EMI/RFI filter designed to reduce EMI in the frequency range of 0.5MHz-2GHz, particularly in the 2-way communication as well as high-speed digital data transmission applications. It is a wide-band filter with low loss and high resistance to heat, featuring excellent electromagnetic shielding performance. It also features excellent common mode suppression, which ensures low EMI levels, and reduces sensitive components’ susceptibility to unwanted signals.

Application Field and Working Principle

The ACH3218-221-TD01 EMI/RFI filter is mainly used to filter high-frequency EMI from the power line as well as from the transmission line. The filter consists of inductors and capacitors that are connected in series and parallel in order to reduce the amplitude of the high-frequency noise.This EMI/RFI filter works by using its inductors and capacitors to block the high-frequency noise at a specific frequency. The filter’s inductance prevents the noise from passing through and the capacitors store and release energy. To work correctly, the filter must be designed for the specific application and its components must be carefully chosen for the desired frequency range. The filter is typically connected in series or parallel with the power and/or transmission lines, depending on the application. This creates an impedance that blocks the high-frequency noise from entering or leaving the system, thus protecting the sensitive electronic equipment.

Conclusion

The ACH3218-221-TD01 EMI/RFI filter is a widely used type of filter. It works by using inductors and capacitors to block the high-frequency noise at the desired frequency range, and its components are carefully chosen for the specific application. It is used in many applications, mainly to filter high-frequency EMI from the power line and transmission line.

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