Technical Standards and Specifications Flashcards
7 cards from real CRE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Technical Standards and Specifications flashcards as text
In reliability engineering, what does 'design margin' refer to in the context of technical specifications?
Answer: The difference between the rated capability of a design and the maximum expected applied stress
Design margin is the difference between a design's capability (strength) and the maximum anticipated stress, providing a buffer against variability and uncertainty.
What is the primary focus of JEDEC JESD47 standard used in semiconductor reliability qualification?
Answer: Stress-test driven qualification and failure mechanism requirements for integrated circuits
JESD47 defines stress-test-driven qualification requirements for integrated circuits, specifying tests to identify failure mechanisms that could cause field failures.
Under IEC 60068, environmental testing standards, what is the purpose of a 'damp heat steady-state' test (Test Cab)?
Answer: Evaluate the ability of equipment to withstand long-term exposure to high humidity and temperature
IEC 60068-2-78 (Test Cab) evaluates how equipment withstands the combined effects of sustained high temperature and high relative humidity, accelerating corrosion and moisture-related failures.
In the SEMI F47 standard, what type of disturbance tolerance is specified for semiconductor manufacturing equipment?
Answer: Voltage sag immunity — equipment must ride through defined voltage sags without process upset
SEMI F47 defines voltage sag immunity requirements, specifying the depth and duration of voltage sags that semiconductor equipment must tolerate without process interruption.
When a product standard specifies a 'B10 life,' what reliability information does this communicate?
Answer: The time at which 10% of units are expected to have failed
B10 life (also written L10) is the time at which 10% of a population of identical items is expected to have failed, equivalent to the 10th percentile of the life distribution.
Which NIST publication provides a framework for cybersecurity that is often incorporated into reliability and safety specifications for critical infrastructure systems?
Answer: NIST Cybersecurity Framework (CSF)
The NIST Cybersecurity Framework (CSF) provides a voluntary framework of standards, guidelines, and best practices for managing cybersecurity risk in critical infrastructure.
What is the key engineering principle behind the concept of 'derating' as applied in reliability specifications such as MIL-HDBK-338?
Answer: Operating components at stress levels below their maximum ratings to reduce failure rates and extend life
Derating involves applying components at stress levels (voltage, current, temperature, power) below their rated maximums to decrease failure rates and improve reliability.