Microcircuits originally designed using commercial design rules cannot be "up-screened" to military temperature ranges. Care should be used to avoid the use of PEMs outside their original design limits.
- Performance is unknown outside original design limit temperature ranges.
- Accepted commercial practice upgrade characterizations and screening tests do not ensure reliability in military environments.
- Design to provide suitable environments for PEMs (e.g., temperature/humidity enclosures, warm-up cycles, etc.).