ST AND ISUPPLI UNVEIL TRISILS TO PROTECT ADSL/VDSL MODEMS.
Fully compatible with digital transmission standards such as ADSL2 and ADSL2+, the SMP80MC family of micro-capacitance transient surge arrestors is the first TRISIL series for which the junction capacitance does not depend on the device breakdown voltage. This is first family of devices to combine an 80A repetitive peak pulse current rating with a low capacitance of only 12pF, typical.
Telecommunications 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. ST's 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 standards such as GR-1089 Core, ITU-T-K20/K21, VDE0433, VDE0878, IEC61000-4-5 and FCC part 68, the expanded family provides fast, bidirectional crowbar protection with maximum surge currents up to 80A (10/1000=B5s). By optimising the trade-off between repetitive peak pulse current and capacitance for broadband transmission, ST has engineered devices having a surge capability of 80A (10/1000=B5s) and a capacitance of 12pF at 50V.
Key parameters of the devices include voltage range from 120V to 270V, a maximum leakage current of only 2=B5A, a maximum breakover voltage up to 345V and a minimum holding current of 150mA. The devices are housed in surface-mount SMB packages (JEDEC DO-214AA).
Ideal for protecting telephone, fax, modem and similar sensitive equipment against lightning strikes and power crossing events, the SMP80MC devices are in full production and cost $0.18 in quantities of 2500 pieces.
About ST's MPA Group (Micro, Power, Analog)
STMicroelectronics is a provider of complete system solutions that levervage its rich portfolio of Microcontrollers, Power and Analog products; advanced process and design technologies; and application expertise. MPA's emphasis on solutions allows the Company to minimize time-to-market for all customers worldwide in existing and emerging applications.
STMicroelectronics is a global provider of semiconductor solutions across the spectrum of microelectronics applications. The company's shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2005, the company's net revenues were $8.88 billion and net earnings were $266 million.
STMicroelectronics can be found on the World Wide Web at http://www.st.com/.
For more information, call 212/821-8959.
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|Publication:||Modem User News|
|Date:||Jul 1, 2006|
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