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This article on the surge Resistance Row (surgeresistornetworks, also known as "linefeedresistors" or "LFR") market, technology trends, end users and major manufacturers a comment.
LFR 50 billion global market circuit protection devices components, not including the module and the black box market, including over-voltage and over current protection device in sales, over-voltage protection devices are the key points of this article. Over-voltage protection components, including a variety of devices, such as silicon avalanche diodes, Zener diodes, thyristors, metal oxide varistors, gas discharge tube, surge resistors row and buffer type of capacitors.
Protection of these devices Electronic Circuit from transient phenomenon. Load switching, and multi-touch, twisted pair and coaxial Cable Above can lead to transient moment of resistance phenomenon. Traditional thick film resistor networks including ruthenium Alumina (Rutheniumonalumina) single-resistor block row; traditional thick film resistor / capacitor network (RC); multi-sheet resistor array, surge resistors, and integrated passive devices Pai (IPD)
. This article focuses on surge resistance row (LFR), these components has been used to protect the central telephone office in the voice and data network, the secondary subscriber line interface.
Latest market conditions LFR is mainly used for Telecommunications Infrastructure market, therefore, the decline in market demand, a severe blow to the LFR industry. This decline in demand began in October 2000 and continued until 2004, during which demand is declining month by month. 2005 Lucent Technology Nortel Networks , Alcatel, Fujitsu, Ericsson And Nokia And other major telecommunication infrastructure equipment providers to reflect the situation of almost all that is still subject to the telecommunications infrastructure equipment sales too much influence. On the other hand, Cisco Data communication network in the business continue to rise, showing growth of Web in the field, and the market for wireless, fixed line installed and not interested in more.
Thyristor and the gas discharge from the telecommunications field of the income and LFR same, from this point, they are the LFR's sister components, they have since 2001 experienced a similar slide. However, the SCR and the field of gas discharge line voltage protection is more common, and LFR demand mainly from the field of telecommunications. Therefore, LFR been during the Great Depression hit hard. There is also a factor in the market downturn exacerbated LFR, LFR size that is larger (in order to comply with Telcordia [BellCore1089] specification), the electrical resistance layer contains a large amount of palladium required to work properly. This makes the LFR is very expensive, an economic downturn in major telecommunications infrastructure companies replace the number one goal.
After 2001, Lucent Technologies in the overall reduction of costs, its designers obviously looking to meet BellCore1089 specification alternatives. Then two things happened. MMC's largest suppliers to seek LFR was acquired, and later was forced to restructure. In 2004, MMC's assets will ultimately be sold to Bourns Inc., the second largest provider C-Mac LFR company was acquired by Solectron. However, LTCC Solectron began its business operations and LFR looking for a buyer, because they do not meet Solectron's EMS business model.
In the fourth quarter of 2004, and the third quarter of 2005, we heard that the field of telecommunication infrastructure growth in demand for LFR, which is in fact a very positive sign. Frankly, we find that over-voltage telecom applications and over-current of 600V certified product sales grew more than 40% over the same period last year. These are Telcordia specifications for the rise and respond to the most demanding components, it appears that in the continued development of infrastructure and components necessary to meet requirements for the maximum. Also worth noting is that demand concentrated in the 600Vdc, further suggests that demand limited to the North American Free Trade Agreement (NAFTA) region, as the European use of components rated at 250V.
