CMT-8120

Voltage Rating - DC:	--
Package / Case:	Vertical, 4 PC Pin
Height (Max):	1.650" (41.91mm)
Size / Dimension:	1.700" L x 0.900" W (43.18mm x 22.86mm)
Mounting Type:	Through Hole
Features:	ESD
Approvals:	--
Ratings:	--
Operating Temperature:	-55°C ~ 105°C
Voltage Rating - AC:	250V
Series:	CMT
DC Resistance (DCR) (Max):	8 mOhm
Current Rating (Max):	17A
Inductance @ Frequency:	2.4mH @ 1kHz
Number of Lines:	2
Filter Type:	Power Line
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Common Mode Chokes

Common Mode Chokes, or CMCs, are components which prevent the uncontrolled flow of electrical current between different electrical circuits, preventing any increase in electrical interference. The CMT-8120 is a type of CMC designed specifically to protect and enhance the performance of digital line interfaces, particularly those operating at high voltage; it is typically used on digital lines operating at 3.3V to 28V and up to 500mA.

The CMT-8120 is segmented into three major sections: common mode chokes, EMI suppression, and power bus filtering. The common mode chokes serve a twofold purpose: first, to improve the signal integrity of the digital line, and second, to reduce the risk of damage to the equipment and lines through attenuating noise. Frequency band range is from 1MHz to 20MHz. The EMI suppression is used to combat radiofrequency interference, and the bus filtering prevents any unwanted voltages from accumulating in the power supply lines, protecting the device and lines from damage as a result.

The CMT-8120 works on the principle of filtering out interference from the input and output of the digital line using common mode chokes. These are constructed from either a single core or dual cores and they are wrapped with a metal tape. The core is constructed from a high permeability material such as ferrite, and the current induced in the core is largely in phase with the voltage that produces it. The metals prevents any current from flowing in the wrong direction, allowing for an even distribution of current in the conductors and suppressing any noise generated in the line.

The CMT-8120 is used in a variety of applications. In telecommunications, it is used to reduce or eliminate hum, buzz, and other noise from the transmitted data, improving the overall quality of the signal. In automotive electronics, they are used to improve the electronic control units (ECU) performance and reduce EMI susceptibility. In medical devices, they are used to reduce the risk of power dissipation, which can cause equipment to malfunction.

In summary, CMT-8120 is a type of common mode choke with specific application to digital lines operating in the 3.3V to 28V range up to 500mA. It has a frequency range of 1MHz to 20MHz and is segmented into three major parts: common mode chokes, EMI suppression, and power bus filtering. The CMT-8120 works on the principle of filtering out any interference from the input and output of the digital line using common mode chokes which are wrapped with special types of metal tape. The CMT-8120 is commonly used in a variety of application, including telecommunications, automotive electronics, and medical devices.

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