Passive Components


Pulse transformers for LAN applications

28 April 2010 Passive Components

TDK-EPC has developed a series of pulse transformers in SMD design for LAN use. With an inductance of at least 200 μH and an insertion loss of not more than 1,5 dB, the design of the new ALT4532-001T series was made possible by the use of advanced fully automated wire winding and packaging that replaces the former manual processes. After winding, the wires to the contact pads are also attached automatically and the package is finished using thermo-compression bonding, resulting in higher quality and reliability.

The benefits of the product’s SMD design come into play when the pulse transformer is used in combination with a common-mode filter to eliminate differential noise. Together, their mounting area is about 35% smaller because the previous version required that the two kinds of components be combined into a module with its own packaging. The new component is used for the transmission of differential pulse signals in high-speed LANs such as 100BASE-TX.



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