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S2-LPS Fiches technique(PDF) 64 Page - STMicroelectronics

No de pièce S2-LPS
Description  Ultra-low power, high performance, sub-1 GHz transceiver
PDF  73 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

S2-LPS Fiches technique(HTML) 64 Page - STMicroelectronics

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Figure 17. QFN24 4x4x1pitch 0.5 mm PCB pad pattern
Table 52. Exposed pad dimension
D2 (mm)
E2 (mm)
2.70
2.70
9.3
QFN recommended profile parameters
The temperature profile is the most important control in the re-flow soldering and it must be fine tuned to establish
a robust process. QFN recommended soldering profile for lead-free mounting is shown in the following table and
picture.
Figure 18. QFN recommended soldering profiles
20
70
120
170
220
270
0
30
60
90
120
150
180
210
240
270
300
Time [s]
60 ± 15 s
240± 5 °C
0.9 ± 0.1 °
C/s
(RtS)
2.0 ± 0.1 °C/s
(RSS)
2.0 ±1.0 °C/s
-
3.0 ± 2.0 °C/s
S2-LPS
QFN recommended profile parameters
DS13831 - Rev 1
page 64/73



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