B82721K2122N020

Series:	B82721
Packaging:	Tray
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Filter Type:	Power Line
Number of Lines:	2
Inductance @ Frequency:	6.8mH @ 10kHz
Current Rating (Max):	1.2A
DC Resistance (DCR) (Max):	280 mOhm (Typ)
Voltage Rating - DC:	--
Voltage Rating - AC:	250V
Operating Temperature:	-40°C ~ 125°C
Ratings:	--
Approvals:	ENEC, UR, VDE
Features:	--
Mounting Type:	Through Hole
Size / Dimension:	0.717" L x 0.520" W (18.20mm x 13.20mm)
Height (Max):	0.823" (20.90mm)
Package / Case:	Vertical, 4 PC Pin

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Common Mode Chokes

Common Mode Chokes, or CMCs, are a type of inductor component that is used to restrict the flow of current in alternating current (AC) circuits. By introducing a high impedance to certain frequency ranges within an AC circuit, CMCs can create intentional attenuation and thus reduce the noise created by said circuit.The B82721K2122N020 is a model of CMC that is specifically designed for switched-mode power supply (SMPS) and front-end applications. This coil type CMC is single-stage, material class F (155°C) insulation, and features an operating temperature range of -40°C to +155°C. It is constructed with an operating frequency of 800 kHz at 1/2 and 1/4 rated current, 20 mT of inductance at 1/2 rated current, and a maximum ripple current of 61 A. In order to understand how CMCs like the B82721K2122N020 work, we must first explore the two concepts of common-mode versus differential-mode electromagnetic interference, or EMI.Common-mode EMI is typically caused by high voltages within an AC circuit, which ionize the air between traces on a printed circuit board or within cabling. When the air becomes ionized, it forms a path that allows energy to be conducted and radiated out of the circuit, thus reducing the circuit\'s electrical performance while also introducing noise. In contrast, differential-mode EMI is generated from current carried on traces or cables, and does not require ionization of the air in order to transmit energy out of a circuit.Common Mode Chokes work to reduce common-mode EMI by providing an extra impedance to the circuit that attenuates the high frequencies most likely to cause interference. The regular shape and small dimensions of the B82721K2122N020 make it an ideal candidate for this kind of application.Specifically, the B82721K2122N020 features two air gaps wrapped around a ferrite core, which together create a high impedance to the unwanted frequencies, thus reducing the amount of noise generated by the electromagnetic field. By providing a high impedance to specific frequencies, CMCs such as the B82721K2122N020 are able to reduce the amount of energy that is radiated away from the circuit. This then helps to ensure that the overall performance of the circuit is not adversely affected by the presence of interference.In conclusion, the B82721K2122N020 is a model of CMC that is designed to be used in switched-mode power supply and front-end applications. By featuring two air gaps wrapped around a ferrite core and an operating frequency of 800 kHz at 1/2 and 1/4 rated current, the B82721K2122N020 is able to provide a high impedance to the frequency ranges most likely to cause interference and thus reduce the amount of noise present in the circuit.

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