RN142-4-02

Voltage Rating - AC:	250V
Package / Case:	Horizontal, 4 PC Pin
Height (Max):	0.787" (20.00mm)
Size / Dimension:	1.303" L x 1.280" W (33.10mm x 32.50mm)
Mounting Type:	Through Hole
Features:	--
Approvals:	UR, VDE
Ratings:	--
Operating Temperature:	-40°C ~ 125°C
Series:	RN
Voltage Rating - DC:	--
DC Resistance (DCR) (Max):	66 mOhm (Typ)
Current Rating (Max):	4A (Typ)
Inductance @ Frequency:	3.3mH @ 1kHz
Number of Lines:	2
Filter Type:	Power Line
Part Status:	Obsolete
Packaging:	Tray

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Common Mode Chokes (CMCs) are a type of transformer designed to restrict electromagnetic interference (EMI) in electronic circuits. The RN142-4-02 CMC is a four-pole CMC intended for use in power supplies and other low-frequency applications.The RN142-4-02 has a working principle in which it is designed to reduce EMI by generating a balanced magnetic field in two dispersed directions. The balanced field is able to reduce EMI in both directions because the EMI’s polarity reverses upon entering the CMC, canceling out the original signal. The RN142-4-02 can effectively control both common mode currents and differential mode currents. The CMC provides an \'electrical shield\' that reduces the unwanted EMI from one conductor to another.The RN142-4-02 can be employed to reduce EMI in a number of applications. It is often used in power supplies, automotive systems, and medical applications that use shielded cabling. It is also used in many consumer electronics such as televisions, mobile phones, audio systems, and computers. The RN142-4-02 is often used in high impedance circuits where the noise must be kept low in order to maintain signal integrity. In this case, the low impedance path provided by the RN142-4-02 allows for better noise control.The RN142-4-02 is a very effective protection device. It is able to reduce noise levels without adding additional impedance to the circuit. It also has a wide-frequency response, making it suitable for a range of applications. Furthermore, it is a low-cost solution and is quite durable.When applying the RN142-4-02, it is important to keep in mind how it works. The diagram below illustrates the four-pole principle:As illustrated in the diagram, the four-pole CMC is composed of two internal multilayer coils, placed parallel to each other, that are connected in phase opposition to each other. This produces the desired balanced magnetic field that can redirect and reduce the stressful EMI signals.In addition to the four-pole principle, the RN142-4-02 also employs filters, dividers, and coils that are electrically connected together to achieve further noise attenuation. The CMC has two primary coils (the "Main" and "Auxiliary") that are wrapped on the outside of the core along with two secondary coils (the "MD", or main divider, and the "AD," or additional divider) that are wound in the center of the core. The MD and AD coils cause the primary coils to interact in different ways, depending on the frequency and waveform of the EMI. The effect of these interactions is that any EMI entering the RN142-4-02 is effectively blocked from passing through it.In addition to the coils and dividers, the RN142-4-02 also utilizes ferrite beads and ferrite cores. The beads are used to reduce the common mode current levels and the cores to provide electrical shielding. The combination of all these components produces a highly effective noise reduction solution that can effectively remove EMI in a wide range of applications.In conclusion, the RN142-4-02 is a highly effective CMC designed for reducing EMI in low-frequency applications. Its four-pole principle, along with its filters, dividers, and ferrite components, makes it an effective solution for noise reduction in a number of applications.

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