Datasheet

DS13105 Rev 4 131/135
STM32WLE5J8/JB/JC Package information
132
Device marking for UFBGA73
The following figure gives an example of topside marking versus pin 1 position identifier
location.
The printed markings may differ depending on the supply chain.
Other optional marking or inset/upset marks, which depend on supply chain operations, are
not indicated below.
Figure 28. UFBGA73 marking example (package top view)
1. Parts marked as “ES”, “E” or accompanied by an Engineering Sample notification letter, are not yet
qualified and therefore not approved for use in production. ST is not responsible for any consequences
resulting from such use. In no event will ST be liable for the customer using any of these engineering
samples in production. ST’s Quality department must be contacted prior to any decision to use these
engineering samples to run a qualification activity.
6.2 Package thermal characteristics
The maximum chip junction temperature (T
J
max) must never exceed the values given in
Table 25: General operating conditions.
The maximum chip-junction temperature, T
J
max (in °C), can be calculated using the
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 Watt. This is the maximum chip
internal power.
P
I/O
max represents the maximum power dissipation on output pins:
P
I/O
max =  (V
OL
× I
OL
) +  ((V
DD
– 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.
When the SMPS is used, a portion of the power consumption is dissipated into the external
inductor, therefore reducing the device power dissipation. This portion depends mainly on
the inductor ESR characteristics.
MSv64357V1
Date code
Product identification
(1)
Y WW
WLE5J8I6
Revision code
R
Pin 1 identifier