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3.3 Recommended Dimensions for User System Mount Pad (Footprint)
Figure 4 shows the recommended dimensions for the mount pad (footprint) for the user system
with an IC socket for a PLQP0176KB-A package (NQPACK176SD: manufactured by Tokyo
Eletech Corporation). Note that the dimensions in figure 4 are somewhat different from those of
the actual chip's mount pad.
Pin 1
10.0 ± 0.2
10.0 ± 0.2
0.25 ± 0.05
2.00 ± 0.10
0.50 × 43 = 21.50 ± 0.30
0.50 × 43 = 21.5 ± 0.30
23.10 max
27.10 min
0.5 ± 0.05
0.50 ± 0.05
Location determination hole
Unit: mm
Dimension and tolerance
Tolerance
±0.05
±0.10
±0.15
±0.20
±0.30
Dimension
Up to 1.2
1.3 to 2.0
2.1 to 5.0
5.1 to 10.0
10.1 or above
Figure 4 Recommended Dimensions for Mount Pad