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CHAPTER 2 PRINTED WIRING BOARD DESIGN


2.1 Lead-type SMDs
2.1.4 Example of mount pad dimension classified by package

(8) QFP mount pad dimensions

Figure 2-10. QFP Mount Pad Dimensions


Table 2-9. Example of Soldering Parameters (Unit: mm)
1.00 0.80 0.65 Remark
0.2 Cleanliness of printed wiring board
0.5 Soldering strength
0.2 Mask pattern precision and observability
0.3 Solder bridge tolerance

To 2.1.4(7) TSOP(2) mount pad dimensions (Lp)To 2.1.4(9) QFP (fine pitch), TQFP, LQFP mount pad dimensions (L)