Component Reliability for Electronic Systems
Answers to RF Cafe Quiz #37
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Cafe Quiz #37
quiz is based on the information presented in Component Reliability for Electronic Systems, authored by
Titu-Marius I. Bajenescu & Marius I. Bazu. Published by
Note: Some of these books are available as prizes in the monthly
RF Cafe Giveaway.
1. What are the two main components of product quality?
c) Conformity and
Quality in fact contains two notions: conformity, which is referring to the conformance to
requirements at the moment of delivery to the client, and reliability, focused on how the conformance to
requirements was maintained during the product usage. (see page 2)
2. What are
the two main ways to quantify the reliability of a system?
d) Laboratory tests, field operational data
Laboratory test are designed to simulate actual field conditions to identify potential problems areas, while field
data under actual operational conditions provide feedback for a continuous improvement process. (see page 22)
3. TQM (Total Quality Management) requires which behaviors?
d) All the above
"TQM is an
applications of the management for the involved methods and human resources in the purpose to control all
processes and to achieve a continuous improvement of the quality," U.S. DoD. (see page 36)
4. A properly designed Accelerated Lift Test (ACL) must do what?
a) Pass through all states, in
the same order as normal, but in shorter time
Along with the actual physical testing is a requirement to
develop applicable statistical models to correlate accelerated testing conditions (see page 115)
5. What are some key components of meaningful failure analysis?
b) Knowledge of the failure
mechanism and establishment of the consequences
The constitutive elements of a failure analysis are:
Knowledge of the failure mechanisms
- Discovery of the causes producing the effects
- Establishment of
- Statistical evaluation of the decisions
- Development of improved methods of analysis
(see page 194)
6. What type of failure has the highest occurrence in semiconductors?
According to Figure 5.7, the order of defect occurrence is metallization (43%),
connections (29%), other (19%), oxide (10%), die (5%), crystallographic (5%). Note that percentages total more
than 100% due to multiple occurrences in some failures. (see page 210)
of the following are likely causes for passive component failure?
d) All the above
Add to that list
inadequate utilization and that about completes the list. (see page 260)
is radiation hardness?
a) Immunity to failure due to radiation, wave or particle
Space environments are more hostile to
microelectronics because Earth's atmosphere is not available to absorb some of the highest energy particles and
wavelengths of electromagnetic radiation. That necessitates special packaging for protection. (see 352)
9. What is the well-known Arrhenius model determine the relationship for?
between failure rate and device junction temperature
Tj = PD (RjC + RCS
+ RSE) + Ta,
where Tj is the junction temperature, PD is the dissipated
power, RjC is the thermal resistance junction-to-case, RCS is the thermal resistance
is the thermal resistance from heat-sink-to-environment, and Ta is the ambient temperature. (see page 366)
10. What is a failure mode unique to MEMS devices compared to traditional ICs?
c) Moving parts can fail
Micro ElectroMechanical Systems are a combination of electrical and mechanical
components (motors, gears, levers, pumps, etc.) on a single substrate, and therefore can experience mechanical
failures beyond simple die fracturing. (see page 589)