MTBF
MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit has been running for 50 000h or only for 100h.
For these types of units the MTTF (Mean Time To Failure) value is the same value as the MTBF value.
| Input 24Vdc |
|
|---|---|---|
MTBF SN 29500, | 731 000h | At 24V, 10A and 40°C |
1 321 000h | At 24V, 10A and 25°C | |
MTBF MIL HDBK 217F
| 267000h | At 10A and 40°C; Ground Benign GB40 |
392000h | At 10A and 25°C; Ground Benign GB25 | |
64000h | At 10A and 40°C; Ground Fixed GF40 | |
86000h | At 10A and 25°C; Ground Fixed GF25 |