Surge arrestors offer ultra capacitance for xDSL applications
12 July 2006
Circuit & System Protection
STMicroelectronics has introduced a range of TRISILs designed to protect ADSL/VDSL modems and similar high bit-rate communications equipment on the CPE (customer premises equipment) side.
Fully compatible with digital transmission standards such as ADSL2 and ADSL2+, the SMP80MC family of micro-capacitance transient surge arrestors is said to be the first TRISIL series for which the junction capacitance does not depend on the device breakdown voltage - the first family of devices to combine an 80 A repetitive peak pulse current rating with a low capacitance of only 12 pF, typical.
Telecoms systems are particularly vulnerable to lightning-induced surges and two levels of protection are normally required: a primary suppressor on each line to absorb the major part of the overvoltage transient and secondary protection devices mounted on individual PCBs to eliminate the residual overvoltage spikes. The primary suppressors must have high surge current capabilities and be able to withstand very high voltages.
According to ST, its TRISIL technology offers superior performance, including a long service life without ageing, tight voltage tolerance, fast response times and failsafe operation, compared to non-silicon alternatives, such as gas discharge tubes. Moreover, the failure mode in the event of an extreme lightning surge results in a short circuit that protects both equipment and personnel.
Compliant with major international standards, the expanded family provides fast, bidirectional crowbar protection. By optimising the trade-off between repetitive peak pulse current and capacitance for broadband transmission, ST has engineered devices having a surge capability of 80 A (10/1000 μs) and a capacitance of 12 pF at 50 V.
Key parameters of the devices include voltage range from 120 V to 270 V, a maximum leakage current of only 2 μA, a maximum breakover voltage up to 345 V and a minimum holding current of 150 mA. The devices are housed in surface-mount SMB packages (JEDEC DO-214AA).
Further reading:
Smarter protection without disruption
NewElec Pretoria
Circuit & System Protection
Designed for operations still running without integrated automation, NewElec’s retrofit-friendly systems let you upgrade performance and safety without overhauling your entire network.
Read more...
Circuit breaker for reliable, compliant protection
RS South Africa
Circuit & System Protection
Legrand’s low-voltage power distribution portfolio encompasses the DX3 range of miniature circuit breakers, designed to deliver dependable protection in residential, commercial and industrial installations.
Read more...
Reducing noise on power supply lines
Future Electronics
Circuit & System Protection
Murata has introduced the EMIFIL ESD Series Noise Filters, a breakthrough solution engineered for superior noise suppression and enhanced electrostatic discharge (ESD) protection.
Read more...
Clearing the Static: Fundamental principles of static control
Actum
Circuit & System Protection
Controlling electrostatic discharge in electronics manufacturing is essential with effective ESD programs built on six key principles.
Read more...
Electrical fire safety in lithium-ion battery rooms
Circuit & System Protection
Pratliperl is a non-combustible, ultra-lightweight aggregate that can be mixed with cement and applied as a plaster or screed to walls, floors, and ceilings.
Read more...
Clearing the Static: ESD training in the workplace
Actum
Circuit & System Protection
To protect sensitive electronic components, A structured, consistent, and sustainable ESD training program is essential.
Read more...
Protect your pumps – protect your profit
NewElec Pretoria
Circuit & System Protection
In South Africa’s demanding agricultural landscape, irrigation is not just an essential service – it is the heartbeat of farm productivity.
Read more...
Clearing the Static: ESD and installation: A durable antistatic solution
Actum
Circuit & System Protection
ESD flooring provides a reliable, long-term solution for managing static electricity by safely dissipating static charges through the floor to a designated ground point.
Read more...
Why wait to automate
NewElec Pretoria
Circuit & System Protection
NewElec’s initiative helps you gain operational visibility via HMI or PLC by retrofitting intelligent motor protection relays without replacing MCCs or rewiring the plant.
Read more...
Clearing the Static: Effectively control static in your workplace
Actum
Circuit & System Protection
Controlling electrostatic discharge in the workplace is crucial to protect sensitive electronic equipment from damage. Implementing an ESD control program involves various measures and tests.
Read more...
printer friendly version