PISA-B-812-B1
PISA-B-812-B4
Apr. 2021 / Rev. 0.1 DS-PISA-B-812-Bx-xx-EN
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All parameters are specified at 24Vdc input voltage, 8x5A output currents, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
15. Lifetime Expectancy
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.
Please note: 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.
Lifetime expectancy
t.b.d.
At 24V, 8x5A and 40°C
t.b.d.
At 24V, 8x2.5A and 40°C
t.b.d.
At 24V, 8x5A and 25°C
t.b.d.
At 24V, 8x2.5A and 25°C
16. 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 cannot 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.
MTBF SN 29500, IEC 61709
t.b.d.
At 24V, 8x5A and 40°C
t.b.d.
At 24V, 8x5A and 25°C
MTBF MIL HDBK 217F
t.b.d.
At 24V, 8x5A and 40°C; Ground Benign GB40
t.b.d.
At 24V, 8x5A and 25°C; Ground Benign GB25
t.b.d.
At 24V, 8x5A and 40°C; Ground Fixed GF40
t.b.d.
At 24V, 8x5A and 25°C; Ground Fixed GF25
