Overvoltages are the greatest threat to sensitive electronic circuitry in telecom and datacom equipment. They can be caused by atmospheric discharges (lightning), inductive coupling from power lines, direct contact between telecom and power lines, or electrostatic discharges. Surge arresters from Epcos are available that can provide superior protection against such overvoltages.
New transmission technologies such as xDSL call for improved protection of telecom installations. Here, the EPCOS surge arresters offer major advantages such as high surge current discharge capacity (2,5 to 40 kA), low pulse breakdown voltage (less than 450 V), extremely low capacitance (about 1 pF) and high insulation resistance (more than 1 GOhm) at the same time.
Current market trends point to a growing demand for surge arresters that can be automatically processed and soldered straight onto PC boards. Epcos therefore developed new surge arresters as surface mount devices (SMDs) to replace conventional components with bent terminal wires. Their square electrodes mean that they can be precisely positioned on the solder pads. These new SMD surge arresters offer significant reduction in board space requirements, easier handling for automatic placement, a more rugged mechanical design and improved solderability. As well as these technical advantages, cost savings are a key argument for switching from manual to automatic placement.
Ideal for xDSL systems, thanks to their low capacitance, the SMD surge arresters provide optimum protection for data transmission at high bit rates and frequencies with negligible signal attenuation. To match applications and customer requirements, the SMD surge arresters are available with two or three electrodes and for various voltages and duty classes (surge current discharge capacity):
The new SMD voltage arresters will mainly be found in electronic telecommunication equipment such as xDSL splitters and modems, MDF connectors, CATV amplifiers, mobile radio basestations and antenna products, analog modems, ISDN cards and adapters, network terminations (NTBAs), PBXs and fax machines.
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