Publication No. SBC329-HRM/1
Specifications 121
A.3 Mechanical Specification
Table A-13 Mechanical Construction
Form Factor
3U, single slot.
Depending on the build variant, the following form factors are supported:
VITA48.1 1”
pitch type 2 (without 2LM covers)
VITA48.2 0.85” pitch types 1 & 2 available (with and without 2LM covers)
VITA48.2 1” pitch types 1 & 2 available (with and without 2LM covers)
Weight
Build levels 4 and 5 without 2LM covers = 525g approximately
Build levels 4 and 5 with 2LM covers = 605g approximately
Build levels 1 to 3 = 540g approximately
The above do not include the weight of any XMC fitted, but do include heatsinks
Dimensions
The air-cooled SBC329 is constructed on a multi-layer Eurocard and conforms to the dimensions specified in IEEE1101.1.
The conduction-cooled SBC329 is constructed on a multi-layer Eurocard and conforms to the dimensions specified in
IEEE 1101.2 (0.8” pitch)
Wedgelocks
Correct adjustment requires a calibrated torque wrench with a hexagonal head of size
3
/
32
”
, set to 0.7 Nm (6 in-lb)
A.4 Reliability (MTBF)
The following table shows the predicted values for reliability as Mean Time Between
Failures (MTBF) and failures per million hours (fpmh) for the SBC329-x4411Xxxx
(see
th
June 2017:
Table A-14 Reliability (MTBF)
Environment
Fail Rate (fpmh) MTBF (Hours)
Ground Benign 30
C
2.21664
451 134
Ground Fixed 40
C
10.90319
91 716
Ground Mobile 45
C
24.73843
40 423
Naval Sheltered 40
C
13.36449
74 825
Naval Unsheltered 45
C
29.31867
34 108
Airborne Inhabited Cargo 55
C
26.26525
38 073
Airborne Inhabited Fighter 55
C
33.70612
26 668
Airborne Uninhabited Cargo 70
C
66.64810
15 004
Airborne Uninhabited Fighter 70
C
86.17611
11 604
Airborne Rotary Wing 55
C
67.36252
14 845
Space Flight 30
C
1.81859
549 876
The predictions are carried out using MIL-HDBK-217F Notice 2, Parts Count
method. To complement the 217 failure rates, some manufacturers’ data is included
where appropriate;
Q values have been modified per the ANSI/VITA51.1-2008
(R2013) Specification. This prediction relates only to the electronic components;
mechanical components are not included.
These failure rates are based only on the components and connectors fitted to the
board at delivery and take no account of user fitted mezzanines.