ELF-18D222F

Voltage Rating - AC:	250V
Package / Case:	Vertical, 4 PC Pin
Height (Max):	0.787" (20.00mm)
Size / Dimension:	0.787" L x 0.827" W (20.00mm x 21.00mm)
Mounting Type:	Through Hole
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	-20°C ~ 105°C
Series:	H
Voltage Rating - DC:	--
DC Resistance (DCR) (Max):	4.024 Ohm (Typ)
Current Rating (Max):	250mA
Inductance @ Frequency:	68mH @ 1kHz
Number of Lines:	2
Filter Type:	--
Part Status:	Obsolete
Packaging:	Bulk

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Common Mode Chokes

Common mode chokes are electrical components used to help reduce the effect of electromagnetic interference (EMI) on signal cables. The ELF-18D222F is a common mode choke designed to reduce EMI on power supply lines from AC to DC. It has a triple series structure which effectively reduces EMI.

Application Field

The ELF-18D222F is commonly used for filtering high-frequency noise on a variety of electronic equipment. Some applications of this device include:

• Power supplies
• Wireless communication systems
• Home entertainment systems
• Mobile phone chargers
• Industrial automation equipment
• Medical device electronics
• Test and measurement equipment
• Computers and peripheral devices

Working Principle

The ELF-18D222F works by blocking high-frequency noise currents. This is done by two inductive components, the common mode inductor and the differential mode inductor.The common mode inductor is designed to prevent the noise currents from “jumping” over it, so any noise currents that are picked up by the EMI source will be blocked by the inductor. The differential mode inductor, on the other hand, is designed to allow any noise currents that pass through the inductor to be dissipated without being coupled to other circuits.This prevents any high-frequency noise currents from affecting the performance of the device. The ELF-18D222F is also designed to have a low DC resistance, which helps to ensure better power supply regulation and less power dissipation in the filter.

Conclusion

The ELF-18D222F is a common mode choke designed to reduce the effect of EMI on power supply lines from AC to DC. It has a triple series structure that effectively reduces EMI and has a low DC resistance. The ELF-18D222F is commonly used for filtering high-frequency noise on a variety of electronic equipment, including power supplies, wireless communication systems, home entertainment systems, mobile phone chargers, industrial automation equipment, medical device electronics, test and measurement equipment, and computers and peripheral devices.

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