CMS3-6-R Filters

Voltage Rating - DC:	--
Package / Case:	Horizontal, 4 PC Pad
Height (Max):	0.236" (6.00mm)
Size / Dimension:	0.550" L x 0.550" W (13.97mm x 13.97mm)
Mounting Type:	Surface Mount
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	-40°C ~ 160°C
Voltage Rating - AC:	--
Series:	CMS
DC Resistance (DCR) (Max):	20 mOhm (Typ)
Current Rating (Max):	2.85A
Inductance @ Frequency:	217µH @ 100kHz
Number of Lines:	2
Filter Type:	Power Line
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Common Mode Chokes

The CMS3-6-R application field and working principle are two aspects of studying the common mode choking (CMC) to mitigate line-ground noises. CMCs are noise filters used in the electronic circuits, typically in the power supplies, to isolate the switching noise of the dc-dc converters from the circuit, making sure the components on the board are not disturbed and the circuitry performance is not compromised.CMCs are used to block high-frequency common-mode signals along the power cables connecting the on-board components to the host board. Common mode signals are typically generated by switching power components like switching on and off of the ICs in the circuit, and they share the same mode, so the term “common mode”.These CMCs are offered in several series: CMS3-6-R series, which is designed to help protect 802.11 and Bluetooth standards applications, as well as technology like Wi-Fi, cellular and Ethernet. The CMS3-6-R series offers three operating frequencies (6MHz to 100MHz).The CMS3-6-R common mode filters are usually designed for power systems running in the range of 6 MHz to 100MHz and applicants in this range have already employed these CMCs. The key here is that the common-mode filters not only reduce common-mode noise along the chosen frequency range but also suppress differential-mode noise, which can originate from other noise sources like line-ground discontinuities.In terms of components, the CMS3-6-R series filters are built using a ferrite core with windings, power line filtering components like capacitors or inductors, and a fuse that can act as a secondary protection device against the improper use or overvoltage condition.The ferrite core is designed to provide attenuation for the signals in the frequency range of interest. The windings provide strong power conditioning; the capacitors are used to stop noise on power lines by removing high-frequency noise. The fuses are designed with high voltage and current capacity for overload protection.The working principle of the CMC filter can be explained by understanding the connections that occur between the incoming power line, the output power line, the telecommunications line, and the surface of the ferrite core. All of these need to be considered when analysing the electrical behaviour of the filter circuit.The power line incoming to the CMC has two nodes; the node which receives power from the main power source and the node which delivers it to the output load. The telecommunications line has one node, which receives the incoming pulse from the antenna, and one node that sends the pulses to the antenna. The nodes on the power line and the telecommunications line are connected to each other through the ferrite core.The ferrite core is composed of three layers that act together to achieve the desired effect. The first layer is composed of high thermal conductivity ceramic material, which dissipates the energy generated by the currents circulating along the power line. The second layer is composed of ferrimagnetic material; it controls and dampens the higher frequency noise signals travelling along the power line. The third layer is composed of fine metal powder alloys; it is used to reduce the stray power noise from other noise sources.The ferrite core of the CMS3-6-R series offers a high performance, low-cost solution for reducing common-mode and differential-mode noise. It supports a wide range of frequencies from 6MHz to 100MHz and is designed to help protect 802.11 and Bluetooth technologies. Its components help to filter and dampen the noise, prevent it from entering into the circuit, and ultimately protect the circuitry from damage or distortion.

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