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C8051F50X Datasheet(PDF) 33 Page - Silicon Laboratories

Part # C8051F50X
Description  Mixed Signal ISP Flash MCU Family
Download  312 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F50X Datasheet(HTML) 33 Page - Silicon Laboratories

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Rev. 1.1
33
C8051F50x-F51x
Figure 4.4. QFN-48 Landing Diagram
Table 4.4. QFN-48 Landing Diagram Dimensions
Dimension
Min
Max
Dimension
Min
Max
C1
6.80
6.90
X2
4.00
4.10
C2
6.80
6.90
Y1
0.75
0.85
e
0.50 BSC
Y2
4.00
4.10
X1
0.20
0.30
Notes:
General
1.
All dimensions shown are in millimeters (mm) unless otherwise noted.
2.
Dimension and Tolerancing is per the ANSI Y14.5M-1994 specification.
3.
This Land Pattern Design is based on the IPC-SM-7351 guidelines.
4.
All dimensions shown are at Maximum Material Condition (MMC). Least Material Condition (LMC) is
calculated based on a Fabrication Allowance of 0.05 mm.
Solder Mask Design
5.
All metal pads are to be non-solder mask defined (NSMD). Clearance between the solder mask and the
metal pad is to be 60
m minimum, all the way around the pad.
Stencil Design
6.
A stainless steel, laser-cut and electro-polished stencil with trapezoidal walls should be used to assure
good solder paste release.
7.
The stencil thickness should be 0.125 mm (5 mils).
8.
The ratio of stencil aperture to land pad size should be 1:1 for all perimeter pads.
9.
A 3x3 array of 1.20 mm x 1.10 mm openings on a 1.40 mm pitch should be used for the center pad.
Card Assembly
10.
A No-Clean, Type-3 solder paste is recommended.
11.
Recommended card reflow profile is per the JEDEC/IPC J-STD-020 specification for Small Body
Components.


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