According to Teledyne Relays two types of its solid-state relays that are used in the military and aerospace industries have entered their fifteenth year of continuous testing, each achieving more than 304 million cycles with no failures.
Teledyne began testing two CD21CD and two HD22CF relays on 20 August, 1990. The Series CD - rated up to 2 A, 60 V d.c. - is a ceramic, 6-pin DIP relay that provides optical isolation and short-circuit protection. The Series HD - rated up to 2 A, 60 V d.c. - is a metal, 14-pin DIP relay that offers true output status feedback and short-circuit protection. Both are hermetically sealed.
The goal is to compare real-life performance with the mean-time-between-failure requirements, according to Antonio Gallegos, product-marketing engineer. The relays were tested under their maximum specified operating conditions, with no heatsink and no current derating. Each part has been exposed to these conditions for more than 84 000 hours - the only interruptions being for testing at every 5 million cycles and calibration every six months.
To date, Teledyne says all parts continue to pass their specification limits, including turn-on into a short and mechanical short tests.
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