SI8233 Datasheet, PDF (51/57 Pages) Silicon Laboratories – 0.5 AND 4.0 AMP ISODRIVERS

Si823x
14. Land Pattern: 14 LD LGA with Thermal Pad
Figure 52 illustrates the recommended land pattern details for the Si8236 in a 14-pin LGA with thermal pad.
Table 26 lists the values for the dimensions shown in the illustration.
Figure 52. 14-Pin LGA with Thermal Pad Land Pattern
Table 26. 14-Pin LGA with Thermal Pad Land Pattern Dimensions
Dimension
(mm)
C1
4.20
C2
1.50
D2
4.25
E
0.65
X1
0.80
Y1
0.40
Notes:
General:
1. All dimensions shown are in millimeters (mm).
2. This Land Pattern Design is based on the IPC-7351 guidelines.
3. 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:
4. All metal pads are to be non-solder mask defined (NSMD). Clearance
between the solder mask and the metal pad is to be 60 µm minimum, all
the way around the pad.
Stencil Design:
5. A stainless steel, laser-cut and electro-polished stencil with trapezoidal
walls should be used to assure good solder paste release.
6. The stencil thickness should be 0.125 mm (5 mils).
7. The ratio of stencil aperture to land pad size should be 1:1.
Card Assembly:
8. A No-Clean, Type-3 solder paste is recommended.
9. The recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
Rev. 1.7
51