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TDK SMD pulse transformers target LAN apps

Posted: 27 Jun 2013     Print Version  Bookmark and Share

Keywords:TDK  pulse transformer  ALT3232M  LAN application  LCD TV 

TDK Corp. has unveiled what it flaunts as the world’s smallest SMD pulse transformers for LAN applications. With dimensions of only 3.2 x 3.2 x 2.8mm, the ALT3232M has 30 percent lower volume and footprint than previous products, indicated the company. In addition, the device has an inductance of 150µH, an insertion loss in the frequency range from 100kHz to 100MHz at 2.5dB, and has a parasitic winding capacitance of only 25pF at 100kHz, TDK detailed.

The number of pulse transformers used in LAN applications is increasing in response to the raised transmission speed of Ethernet networks, namely from 100-1000Mbps. In addition, several transformers are usually placed on a circuit board, so that minimized component dimensions are of crucial importance.

LAN interfaces are not only used in computers and other IT equipment, but increasingly also in LCD TV sets and other audiovisual appliances. They transmit the pulse-shaped signals at high transmission speeds and at the same time provide electrical insulation between input and output.

By applying technology that has proved its worth in the production of SMD common mode filters, TDK was able to devise an automated winding process suitable for mass production. This reduces characteristics variations that tend to occur with manual winding, and thereby offers enhanced reliability and quality, continued TDK.

Series production will start in July 2013.

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