PPC7A Product Manual
Specifications
A-5
1
st
Edition
Reliability (MTBF)
The following table shows the calculated MTBFs for the PPC7A-1BA-10:
Environment
Fail Rate
(Failures Per Million Hours)
MTBF (H
OURS
)
Ground benign 30
°
c
6.298724
158,762
Ground fixed 40
°
c
14.72659
67,904
Ground mobile 45
°
c
26.94278
37,116
Naval sheltered 40
°
c
23.7376
42,127
Naval unsheltered 45
°
c
38.72897
25,820
Airborne inhabited cargo 55
°
c
31.34095
31,907
Airborne inhabited fighter 55
°
c
41.45621
24,122
Airborne uninhabited cargo 70
°
c
52.65228
18,993
Airborne uninhabited fighter 70
°
c
79.78461
12,534
Airborne rotary wing 55
°
c
56.9936
17,546
Space flight 30
°
c
5.5010268
181,784
Missile flight 45
°
c
32.6502
30,628
Missile launch 55
°
c
78.40276
12,755
These failure rates are based only on the components and connectors fitted to the board at delivery and
take no account of user fitted PMCs.
The failure rates used in this calculation are based on MIL-HDBK-217F Notice 1 (parts count method)
with commercial or non-military quality level. Where a component did not comply with the MIL-HDBK,
the closest equivalent, compliant component was used.
Environmental Specifications
B
UILD
S
TYLE
O
PERATING
T
EMP
(°C)
S
TORAGE
T
EMP
(°C)
V
IBRATION
S
HOCK
H
UMIDITY
C
OMMENTS
Standard
(level 1)
0 to +55 with
airflow of 300
feet/minute
-50 to +100
0.002g2/Hz from
10 to 2000 Hz
random, and 2g
sinusoidal from 5
to 500 Hz
20g peak
sawtooth,
11ms
duration
Up to 95% RH
Commercial grade
cooled by forced air, for
use in benign
environments and
software development
applications.
Extended
temp
(level 2)
-20 to +65 with
airflow of 300
feet/minute
-50 to +100
0.002g2/Hz from
10 to 2000 Hz
random, and 2g
sinusoidal from 5
to 500 Hz
20g peak
sawtooth,
11ms
duration
Up to 95% RH
with varying
temperature.
10 cycles, 240
hours
As Standard but
conformally coated and
temperature
characterised.
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