Technical data

Specifications
http://www.mcg.mot.com/literature A-3
A
Special Considerations for Elevated-Temperature Operation
The following information is for users whose applications for the
MVME172LX may subject it to high temperatures.
The MVME172LX uses commercial-grade devices. Therefore, it can
operate in an environment with ambient air temperatures from 0° C to 70°
C. Several factors influence the ambient temperature seen by components
on the MVME172LX. Among them are inlet air temperature; air flow
characteristics; number, types, and locations of IP modules; power
dissipation of adjacent boards in the system, etc.
A temperature profile of the MVME172-223 was developed in an
MVME945 12-slot VME chassis. This board was loaded with one
GreenSpring IP-Dual P/T module (position a) and one GreenSpring IP-488
module (position b). One 25W load board was installed adjacent to each
side of the board under test. The exit air velocity was approximately 200
LFM between the MVME172LX and the IP-Dual P/T module. Under
these conditions, a 10° C rise between the inlet and exit air was observed.
At 70° C exit air temperature (60° C inlet air), the junction temperatures of
devices on the MVME172LX were calculated (from the measured case
temperatures) and did not exceed 100° C.
!
Caution
For elevated-temperature operation, perform similar
measurements and calculations to determine the actual
operating margin for your specific environment.
To facilitate elevated-temperature operation:
1. Position the MVME172LX in the chassis to allow for maximum
airflow over the component side of the board.
2. Do not place boards with high power dissipation next to the
MVME172LX.
3. Use low-power IP modules only.