User's Manual l TQMa8MxML UM 0103 l © 2022, TQ-Systems GmbH
Page 53
6.4
Climate and operational conditions
The operating temperature range for the TQMa8MxML strongly depends on the installation situation
(heat dissipation by heat conduction and convection); hence, no fixed value can be given for the TQMa8MxML.
In general, a reliable operation is given when following conditions are met:
Table 44:
Climate and operational conditions
Variant
Ambient temperature
Relative humidity not condensing
(operational / storage)
Remark
Operational
Storage
C
0 °C to +85 °C
–40 °C to +85 °C
10 % to 90 %
Consumer
E
–25 °C to +85 °C
Extended (default)
I
–40 °C to +85 °C
Industrial
Table 45:
Maximum operating temperatures
Parameter
Temp. range
T
J
i.MX 8M Mini, i.MX 8M Nano
–40 °C to +105 °C
T
J
PMIC
–40 °C to +105 °C
Case temperature SDRAM
–40 °C to +85 °C
Case temperature other ICs
Ambient temperature see Table 44
Detailed information concerning the i.MX 8M Mini thermal characteristics is to be taken from NXP documents (6).
Attention: Destruction or malfunction, TQMa8MxML cooling
The i.MX 8M Mini belongs to a performance category in which a cooling system is essential.
It is the user’s sole responsibility to define a suitable heat sink (weight and mounting position)
depending on the specific mode of operation (e.g., dependence on clock frequency, stack height,
airflow, and software).
Particularly the tolerance chain (PCB thickness, board warpage, BGA pads, BGA package, thermal pad,
heatsink) as well as the maximum pressure on the i.MX 8M Mini must be taken into consideration
when connecting the heat sink, see (10). The i.MX 8M Mini is not necessarily the highest component.
Inadequate cooling connections can lead to overheating of the TQMa8MxML and thus malfunction,
deterioration or destruction.
6.5
Reliability and service life
The MTBF calculated for the TQMa8MxML is 1,270,405 hours with a constant error rate @ +40 °C, Ground Benign.
The TQMa8MxML is designed to be insensitive to shock and vibration.
The TQMa8MxML must be assembled in accordance with the processing instructions provided by TQ-Systems GmbH.
Detailed information concerning the i.MX 8M Mini service life under different operational conditions is to be taken from the NXP
Application Note (11).
