ACM-21-371M-T

Voltage Rating - AC:	--
Package / Case:	Horizontal, 4 PC Pad
Height (Max):	0.055" (1.40mm)
Size / Dimension:	0.079" L x 0.047" W (2.00mm x 1.20mm)
Mounting Type:	Surface Mount
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	-40°C ~ 85°C
Series:	ACM-21
Voltage Rating - DC:	50V
DC Resistance (DCR) (Max):	400 mOhm
Current Rating (Max):	280mA
Impedance @ Frequency:	370 Ohms @ 100MHz
Number of Lines:	2
Filter Type:	Signal Line
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Common Mode Chokes

Common mode chokes, also known as line filters, are components used in electronic circuits that provide electromagnetic interference (EMI) noise filtering. Common mode chokes are often used in switch mode power supplies and other power systems. The ACM-21-371M-T is an inductor device commonly used as a common mode choke. It is designed to provide effective suppression of conducted high frequency noise on power lines.

Application Field and Working Principle

The ACM-21-371M-T is a small, toroidal inductor designed to filter excessive noise generated in high frequency switching circuits, such as switching power supplies. The device consists of two toroidal inductors with a common magnetic core, which are connected in series. The inductor windings have a common mode voltage rating of 600 Volts RMS.The ACM-21-371M-T is designed to provide high common mode and differential mode impedance in power lines. In addition to reducing EMI, the device also acts as a line filter, reducing the amount of noise that can travel through power lines to other electronic components. The ACM-21-371M-T has a typical common mode impedance of 27 Ohms at 100kHz, and a typical differential mode impedance of 0.2 Ohms at 100kHz.The working principle of the ACM-21-371M-T is based on the fact that common mode currents are generated by electromagnetic fields. When common mode currents travel through the device, they induce magnetic fields in the adjacent inductors. This causes an opposing magnetic field to be generated, creating an impedance to the common mode currents. This impedance is known as common mode impedance or common mode rejection ratio (CMRR).The ACM-21-371M-T has a very high common mode impedance and a low differential mode impedance, providing excellent attenuation of EMI noise in high frequency switching circuits. The device also has a very low insertion loss, meaning that it does not introduce any significant amount of power loss into the power line.Overall, the ACM-21-371M-T is an excellent device for reducing EMI noise in high frequency switching circuits. It provides an effective and efficient way to protect sensitive components from interference, making it a common choice for applications where EMI must be controlled.

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