Better TVS devices to protect avionics installations

October 12, 2015 // By Graham Prophet
Low capacitance transient voltage suppression diodes from Microsemi represent a higher level of protection than previous devices have provided; the 150W hermetic TVS parts, “Provide ultimate protection for avionic data network applications”.

These ultra-low capacitance power transient voltage suppression (TVS) diodes use the company’s RF PIN diode expertise, to provide protection of high speed data lines and other applications where the threat requirement’s magnitude greatly surpasses the capability of other typical low capacitance TVS devices for Ethernet protection and other data interfaces with speeds up to 500 Mbit/sec.

The 1N8149 to 1N8182 and 1N8149US to 1N8182US surface mount low capacitance TVS diode products are available as 150W peak pulse power at 10/1,000 microseconds with very low capacitance of 4 pF maximum. The 150W TVS diodes equate to greater than 1,000W at 8/20 microseconds and are offered in voltages ranging from 6.8V to 170V. They also comply with high-end industrial and avionics electrostatic discharge (ESD), electrical fast transient (EFT) and lower level lightning threats in accordance with IEC61000-4-2, IEC61000-4-5 and RTCA-DO160 specifications. Higher power ratings of 500W at 10/1,000 microseconds with low capacitance are in development for even higher transient threats.

“The trends toward increased aircraft electrification, greater reliability and higher fuel efficiency are on the rise, and consequently driving the need for increasingly capable, lighter and smaller TVS solutions that provide superior protection against transient over-voltage occurrences. From a global demand perspective, the overall market for protection devices is likely to reach $1 billion by 2018,” Microsemi comments.

These TVS diodes provide aircraft and other electrical systems with critical protection by going into avalanche breakdown within no more than a few nanoseconds after a strike, clamping the transient voltage and routing its current to the ground. They are available for all screening levels and are housed in void-less hermetically-sealed axial and surface mount glass packages. Data sheets are available at

Microsemi; / /