TDK announced the world’s smallest SMD pulse transformers for LAN applications, with dimensions of only 3,2 x 3,2 x 2,8 mm. Their inductance is 150 µH, insertion loss in the frequency range from 100 kHz to 100 MHz is 2,5 dB, and parasitic winding capacitance is only 25 pF at 100 kHz.
The number of pulse transformers used in LAN applications is increasing in response to the raised transmission speed of Ethernet networks, namely from 100 to 1000 Mbps. In addition, several transformers are usually placed on a circuit board, so that minimised component dimensions are of crucial importance. 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 characteristic variations that tend to occur with manual winding, and thereby offers enhanced reliability and quality.
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