New cost-effective transient voltage suppressors protect aircraft by about 20 percent from lightning strikes

November 01, 2012 // By Paul Buckley
Microsemi Corporation has introduced two new cost-reduced versions of its transient voltage suppressor (TVS) devices in its patented plastic large area device (PLAD) package.

The lower cost 15 kW MPLAD15KP and 30 kW MPLAD30KP TVS families meet lightning-protection requirements in aircraft, including the multi-stroke standard (RTCA DO-160E), that have grown in importance as a result of the introduction and growing use of composite body airframes. Both devices are offered in a surface mount package and are backwards-compatible with the previous generation of Microsemi's PLAD packaged TVS parts - there are no changes to electrical or thermal specifications.

The new 15 kW and 30 kW PLAD designs lower the cost of voltage surge protection, preventing the disruption of digital signal processing, component damage and interruption of function due to inductive load dumps or the indirect effects of lightning. The PLAD package combines a large die size with a large exposed bottom-side metal slug for heat sinking that improves power handling as compared to through-hole packaged designs. The PLADs are also compatible with standard surface mount assembly automation.

The 15 kW family operates at (standoff) ranges from 7 V to 200 V, and the 30 kW family comes in voltages from 14 to 400 V. Both unidirectional and bi-directional versions are available. The parts can be supplied in RoHS-compliant form (2002/95/EC) or with SnPb lead plating. They are halogen free (IEC 61249-2-21) and meet MSL level 1 (J-STD-020) industry standards.

All of Microsemi's PLAD packaged devices are 100 percent surge tested and can be supplied in various 'upscreened' versions that have been exposed to levels of additional qualification and screening tests (similar to those applied to JANX military grade devices) to weed out device infant mortalities and improve reliability.

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