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Surge arrestors offer ultra-low capacitance

Posted: 22 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:SMP80MC? surge arrestor? Trisil? STMicroelectronics? Gina Roos?

STMicroelectronics has expanded its Trisil crowbar-type diode family with the introduction of the SMP80MC surge arrestors. These devices are designed to protect ADSL/VDSL modems and other high bit-rate customer premise equipment.

Suitable for protecting telephone, fax, modem and similar equipment against lightning strikes and power crossing events, the SMP80MC family of micro-capacitance transient surge arrestors is fully-compatible with digital transmission standards such as ADSL2 and ADSL2+.

The SMP80MC family provides fast, bidirectional crowbar protection with maximum surge currents up to 80A (10/1000 us) and a capacitance of 12pF at 50V. This was achieved, said the company, by optimizing the trade-off between repetitive peak pulse current and capacitance for broadband transmission. Other key parameters include a voltage range from 120V to 270V, a maximum leakage current of only 2A, and a minimum holding current of 150mA.

The SMP80MC family is the first Trisil series for which the junction capacitance does not depend on the device breakdown voltage, and is the first to combine an 80A repetitive peak pulse current rating with a low capacitance of 12pF. The Trisil technology is said to offer long service life without ageing, tight voltage tolerance, fast response times and failsafe operation, compared to non-silicon alternatives such as gas discharge tubes. In addition, the failure mode in the event of an extreme lightning surge results in a short circuit that protects both equipment and personnel.

The devices are housed in surface-mount SMB packages (JEDEC DO-214AA). They are compliant with major standards such as GR-1089 Core, ITU-T-K20/K21, VDE0433, VDE0878, IEC61000-4-5 and FCC part 68.

The SMP80MC devices are priced at 18 cents in quantities of 2,500.

- Gina Roos

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