Datasheet
DocID028800 Rev 1 195/200
STM32L431xx Package information
197
7.10 Thermal characteristics
The maximum chip junction temperature (T
J
max) must never exceed the values given in
Table 21: General operating conditions.
The maximum chip-junction temperature, T
J
max, in degrees Celsius, may be calculated
using the following equation:
T
J
max = T
A
max + (P
D
max x
JA
)
Where:
• T
A
max is the maximum ambient temperature in °C,
•
JA
is the package junction-to-ambient thermal resistance, in °C/W,
• P
D
max is the sum of P
INT
max and P
I/O
max (P
D
max = P
INT
max + P
I/O
max),
• P
INT
max is the product of I
DD
and
V
DD
, expressed in Watts. This is the maximum chip
internal power.
P
I/O
max represents the maximum power dissipation on output pins where:
P
I/O
max = (V
OL
× I
OL
) + ((V
DDIOx
– V
OH
) × I
OH
),
taking into account the actual V
OL
/ I
OL
and V
OH
/ I
OH
of the I/Os at low and high level in the
application.
7.10.1 Reference document
JESD51-2 Integrated Circuits Thermal Test Method Environment Conditions - Natural
Convection (Still Air). Available from www.jedec.org
Table 102. Package thermal characteristics
Symbol Parameter Value Unit
JA
Thermal resistance junction-ambient
UFQFPN48 - 7 × 7 mm / 0.5 mm pitch
33
°C/W
Thermal resistance junction-ambient
LQFP48 - 7 × 7 mm / 0.5 mm pitch
57
Thermal resistance junction-ambient
WLCSP49 3.141 x 3.127 / 0.4 mm pitch
48
Thermal resistance junction-ambient
LQFP64 - 10 × 10 mm / 0.5 mm pitch
46
Thermal resistance junction-ambient
UFBGA64 - 5 × 5 mm / 0.5 mm pitch
65
Thermal resistance junction-ambient
WLCSP64 3.141 x 3.127 / 0.35 mm pitch
46
Thermal resistance junction-ambient
LQFP100 - 14 × 14 mm / 0.5 mm pitch
42
Thermal resistance junction-ambient
UFBGA100 - 7 × 7 mm / 0.5 mm pitch
57
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