ELF-18N005A

Voltage Rating - AC:	--
Package / Case:	Vertical, 4 PC Pin
Height (Max):	1.083" (27.50mm)
Size / Dimension:	0.709" L x 1.083" W (18.00mm x 27.50mm)
Mounting Type:	Through Hole
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	--
Series:	N
Voltage Rating - DC:	--
DC Resistance (DCR) (Max):	1.68 Ohm (Typ)
Current Rating (Max):	500mA
Number of Lines:	2
Filter Type:	--
Part Status:	Obsolete
Packaging:	Bulk

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Common Mode Chokes: ELF-18N005A Application Field and Working Principle

Common mode chokes, also known as common mode filters, are a type of electromagnetically coupled component used to attenuate both differential and common mode electric signals in electrical circuits. The ELF-18N005A is a high precision common mode choke that is often used in applications where operating temperatures are anywhere from -40 °C to +125 °C.It has a rated current of DC 130mA and an insulation resistance of 10MΩ or higher.The primary function of common mode chokes is to provide signal isolation, noise filtering, reduce electromagnetic interference (EMI), and to pick up and store energy. Common mode choke coils are constructed of two or more coils of wire and they generate a magnetic field when an alternating current flows through them. This magnetic field produces a coupling effect between the coils which works to filter out common mode noise and attenuate unwanted signals.In order to understand how the ELF-18N005A works, it is important to first understand the different types of common mode choke. Broadly, there are two types of common mode chokes, namely continuous conduction mode (CCM) and discontinuous conduction mode (DCM).In CCM, the core magnetically links the coil windings and the choke works as a series inductor in each of the two legs of the circuit. This ensures that the voltage across the components in each leg is the same, thus preventing the flow of unwanted common mode noise from one leg to the other.In DCM, the core magnetically links the coil windings and the choke works as a current limiting element in each leg of the circuit. This ensures that the current in each of the two legs of the circuit is limited, thus reducing the amount of common mode noise that is generated.The ELF-18N005A is designed to operate in both CCM and DCM modes. This makes it ideal for applications such as telecommunications, automotive, aerospace, and banking. It is also used in medical equipment, computers, and even home appliances.In terms of applications, the ELF-18N005A is ideal for use in the transmission of high quality communications signals over long distances. It can also be used in the protection of sensitive electronic components from voltage over-swing and current surges. This makes it an excellent choice for applications that require high precision and excellent signal integrity.The working principle of the ELF-18N005A is fairly simple. When current passes through the coils of the common mode choke, a magnetic field is produced. This magnetic field serves to filter out common mode noise, attenuate unwanted signals, and provide signal isolation. The magnitude of the magnetic field also depends on the strength of the current that is passed through the coils.The ELF-18N005A is specifically designed to operate in both CCM and DCM modes, thus providing flexibility and excellent signal quality in various types of applications. As such, it is an ideal choice for applications that require high precision and excellent signal integrity.

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