Datasheet

DocID026284 Rev 4 123/128
STM32F091xB STM32F091xC Package information
124
Using the values obtained in Table 80 T
Jmax
is calculated as follows:
– For LQFP64, 45 °C/W
T
Jmax
= 100 °C + (45 °C/W × 134 mW) = 100 °C + 6.03 °C = 106.03 °C
This is above the range of the suffix 6 version parts (–40 < T
J
< 105 °C).
In this case, parts must be ordered at least with the temperature range suffix 7 (see
Section 8: Ordering information) unless we reduce the power dissipation in order to be able
to use suffix 6 parts.
Refer to the figure below to select the required temperature range (suffix 6 or 7) according to
your temperature or power requirements.
Figure 54. LQFP64 P
D
max versus T
A
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