The following short paper is a primer for MTBF.
MTBF stands for Mean Time Between Failure.
Failure rate in [1/Hours] is defined as 1/MTBF.
MTBF is an important parameter for critical equipment. Equipment MTBF is the cornerstone for many analyses:
- System Reliability and Availability
- System Safety
- Spare Parts provisioning
- Comparing design alternatives
- Comparing COTS
A simple formula for assessing equipment MTBF from field or test data is:
Equation 1: MTBF=Total operation hours / Total number of failures
Equation 1 is relevant for cases where field data exists.
If field data is not available, there are other sources for MTBF:
• Original Equipment Manufacturer (OEM) data
• MTBF prediction standards
• Failure rate databases such as RADC, NPRD and OREDA
MTBF calculation for electronic components:
Several standards exist for MTBF prediction of electronic systems:
|MIL-HDBK 217F / G||RELIABILITY PREDICTION OF ELECTRONIC EQUIPMENT|
|MIL-HDBK 217F2 with ANSI/VITA 51.1||RELIABILITY PREDICTION OF ELECTRONIC EQUIPMENT|
|FIDES||Reliability Methodology for Electronic Systems|
|IEC 62380||Universal model for reliability prediction of electronics components, PCBs and equipment|
|Telcordia||Reliability Prediction Procedure for Electronic Equipment|
|HDBK GJB299||Reliability Prediction Handbook for Electronic Equipment|
|SN 29500||Failure rate, component, expected value, dependability|
|HRD 5||Handbook of Reliability Data for Electronic Components|