Voltage Rating - AC:	--
Package / Case:	0504 (1210 Metric), 4 Lead
Height (Max):	0.026" (0.67mm)
Size / Dimension:	0.049" L x 0.039" W (1.25mm x 1.00mm)
Mounting Type:	Surface Mount
Features:	--
Approvals:	--
Ratings:	--
Operating Temperature:	-25°C ~ 85°C
Series:	TCM-H
Voltage Rating - DC:	10V
DC Resistance (DCR) (Max):	850 mOhm
Current Rating (Max):	100mA
Impedance @ Frequency:	90 Ohms @ 100MHz
Number of Lines:	2
Filter Type:	Signal Line
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Common Mode Chokes

Common Mode Chokes (CMCs) are used to suppress high-frequency noise in power distribution and industrial electronic applications. The TCM1210H-900-2P-T000 is an example of such a device, whose application field and working principle will be explored here.A CMC is a small electromagnetic component that acts as a high-frequency filter (more than 1MHz). It is basically a coil with two or more windings on an individual core. The CMC is positioned between the power source and the electronic device in order to reduce noise interference and shield against electrical noise coming from outside sources. CMCs can be used in a variety of applications, from large industrial systems to small home appliances. They can even be used in automobiles, where they can protect electronics from damage and interference caused by electromagnetic induction (EMI).TCM1210H-900-2P-T000 is a 10-milli-Ohm common-mode choke, which has been designed to operate in a temperature range up to 125°C in order to accommodate a wide harmonic range of switching power supplies. The TCM1210H-900-2P-T000 has two windings, with each winding consisting of two layers of bifilar copper wound on a ferrite core in order to provided the maximum DC (direct current) resistance of 50 milli-Ohm. This type of CMC is highly resistant to EMI, and therefore can be used in sensitive industrial electronic applications. In terms of the working principle, the two windings of a common-mode choke function in the same way as the two plates of a capacitor. The magnetic fields generated by each winding interact with each other, and any frequencies outside of the desired frequency range are suppressed. The higher the inductance value of the device, the more suppression it provides. The TCM1210H-900-2P-T000 common-mode choke has a significant inductance value, and can therefore provide high levels of noise suppression. Another advantage of this particular device is its low DC resistance, which ensures minimal power loss even with high DC load currents.To sum up, the TCM1210H-900-2P-T000 is an example of a CMC that is suitable for a range of industrial electronic applications, as it features good noise suppression and low power loss. Furthermore, its high temperature rating allows it to perform reliably in a wide range of operating conditions.

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