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IC and Component Selection for Space Sy stems – Presented by Kenneth A . LaBel 13 Radiation Effects and Reliability • Radiation reliability is viewed differently than a normal reliability (bathtub) consideration – It is …

IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel

Reliability “versus” Radiation:

Basic Electronics Reliability

• Reliability of electronics is viewed traditionally using a

“bathtub” curve view of mean time to failure (MTTF)

– This looks at both intrinsic (wearout) and extrinsic (infant

mortality) failure modes

Source: http://www.weibull.com/hotwire/issue21/hottopics21.htm

IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel

Radiation Effects and Reliability

• Radiation reliability is viewed differently than a

normal reliability (bathtub) consideration

– It is a mix of a MTTF (or Time to First Failure - TTFF)

condition known as Total Ionizing Dose (TID) or

Displacement Damage (DD) and a Mean Time Between

Failures (MTBF) condition known as Single Event

Effects (SEE).

Time

Increasing failure rate

Dose

Normal

Distribution of

Failures

TTFF

MTTF

TID

Time

Increasing failure rate

Random

Distribution of

Failures

SEE

Spikes in SEE rates

can occur based on

position in orbit

and solar event

IC and Component Selection for Space Systems – Presented by Kenneth A. LaBel

Radiation and Traditional IC Reliability:

Are the two related?

• The short answer is yes

– Radiation MTTF conditions can accelerate reliability

wearout mechanisms either by eroding electrical signal

margins or material damage

– Radiation MTBF conditions also can impact long-term

reliability

• A single energetic particle, for example, can cause device

failure instantaneously (such as with a gate rupture) or at a

later time due to material damage.

• The methods of coupling the radiation-induced impacts

into reliability calculations are limited

– NEPP Program has a new effort to explore this coupling on

state-of-the-art commercial Flash memories that are highly

sought by flight programs

Latent damage from a single particle