ELF-18D650P

Voltage Rating - AC:	--
Package / Case:	Vertical, 4 PC Pin
Height (Max):	1.362" (34.60mm)
Size / Dimension:	1.142" L x 0.827" W (29.00mm x 21.00mm)
Mounting Type:	Through Hole
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	-20°C ~ 105°C
Series:	V
Voltage Rating - DC:	--
DC Resistance (DCR) (Max):	--
Current Rating (Max):	700mA
Number of Lines:	2
Filter Type:	Power Line
Part Status:	Obsolete
Packaging:	Bulk

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Common Mode Chokes

Common mode chokes, also known as EMI filters or differential mode filters, are passive electrical filters used to suppress (block) electromagnetic noise and crosstalk from interfering with signals. They are commonly used in switch-mode power supplies, signal lines, and communications circuits. The ELF-18D650P is a common mode choke developed by Meishuo Electric Co., Ltd. It is specially designed for EMI suppression in dc-dc converters. The choke is rated for operation up to 18A at 65V and features a low dc resistance of 0.07 Ohm. It is characterized for operation at frequencies from 10kHz to 1MHz. The ELF-18D650P is based on a three-coil design that allows for the suppression of both common mode and differential mode noise. The electrical construction of the choke consists of three uniformly wound coils on a ferrite core. The first coil has a number of turns which is larger than the other two coils. It operates in a differential mode and connects directly to the power source. The second coil, which has an equal number of turns, is located in the middle and connected to the first and third coils in series. This coil operates in a common mode, which is the mode used to suppress unwanted electrical noise. The third coil has the same number of turns as the first and is placed in the opposite direction as the second. It serves as an output choke and connects directly to the load. In operation, the ELF-18D650P acts as an inductor between the power source and the load, effectively blocking the noise from being transmitted. The differential mode coil increases the inductance of the choking effect, while the common mode coil reduces the amount of noise that passes through the choke. This helps reduce interference while preserving signal integrity. The ELF-18D650P has been designed for industrial applications, such as telecommunications, factory automation, and motor control. It is suitable for applications where high efficiency and performance are required but the cost needs to be kept to a minimum. This common mode choke is RoHS compliant and CE marked for safety. Its high current capability and low-profile design make it ideal for use in a wide range of industrial and electronics applications.

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