radiation hardened


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radiation hardened

Refers to electronic products used in space, satellite, nuclear plant and military applications. They are built to withstand cosmic rays and other natural electromagnetic radiation, as well as nuclear explosions. The effects of such radiation can be a temporary alteration or a slow degradation of the semiconductor elements in memory cells and transistors. If either a cell or transistor is induced to change its state, it can cause a program to crash (see abend). As the elements in a chip are made smaller, radiation has an increasingly greater and harmful influence.

"Rad hard" products are highly insulated from the outside world. In addition, devices may be built with redundant components at the system level or at the circuit level, and error-correcting memories can detect and correct a memory failure.


A Wide Resistance Difference
This C-RAM phase change 4MB memory chip is shown without the cover and before the leads are cut. When the bit is 0, the memory cell resistance is 5,000 ohms, but 100,000 ohms when a 1. Due to the huge resistance difference between a 0 and 1, the chip is inherently radiation hardened (see phase change memory). (Image courtesy of BAE Systems, www.baesystems.com)
References in periodicals archive ?
The report also segments the radiation hardened electronics & semiconductors market by components such as processors & controllers, memory devices, power management, FPGAs & ASICs, and other components.
Describing the same data from a different perspective, this fiber had been radiation hardened to such a degree by the original irradiation that the results of re-irradiation 3 months later at the same dose rate resulted in newly induced absorption that was generally less than the final value at the end of the first irradiation.
TI offers solutions and services for extended temperature ranges for -55 degrees Celsius up to 220 degrees Celsius, radiation hardened designs, baseline control, extended product life cycles, obsolescence mitigation, quality conformance to military standards, ITAR flow support and in-house process technology.
Additional options recently made available for OEM, Military and other applications include radiation hardened, submersible, and gearhead units.

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