YR40.245 Datasheet, PDF (6/18 Pages) PULS GmbH – SINGLE REDUNDANCY MODULE

Y-Series
YR40.245
12-28V, 40A, SINGLE REDUNDANCY MODULE
5. LIFETIME EXPECTANCY AND MTBF
Load conditions
Output: 20A
Output: 40A
Lifetime expectancy ^*)
557 000h ^*)
134 000h ^*)
at 24V and 40°C
1 576 000h ^*)
378 000h ^*)
at 24V and 25°C
MTBF ^**) SN 29500, IEC 61709
13 290 000h
6 357 000h
at 24V 40°C
22 628 000h
12 238 000h
at 24V 25°C
MTBF ^**) MIL HDBK 217F
381 000h
278 000h
Ground Fixed GF40 (24V and 40°C)
518 000h
366 000h
Ground Fixed GF25 (24V and 25°C)
1 816 000h
1 401 000h
Ground Benign GB40 (24V and 40°C)
2 486 000h
1 861 000h
Ground Benign GB25 (24V and 25°C)
*) The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime
expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) 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.
Apr. 2014 / Rev. 1.1 DS-YR40.245-EN
All parameters are specified at 24V, 40A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
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