9.2.6.16 Quad flat pack (no leads) [QFNL] or Small outline integrated circuit (no leads) Quad flat pack (no leads) [QFNL] or Small outline integrated circuit (no leads) [SOICNL] Joints formed to components having no significant external lead form shall (D1 D2 D3) meet the dimensional and solder fillet requirements of Table 9-16 and Figure 9-16. Non-conformance to the requirements of Table 9-16 is a defect.Table 9-16 Dimensional Criteria - PQFNFeature Dim. Class 1 Class 2 Class 3Maximum Side Overhang A < 50% W < 25% W NoneToe Overhang B None (Note 1) None (Note 1) None (Note 1)Minimum End Joint Width C 50% W 25% W 100% WMinimum Side Joint Length D Note 2 Note 2 Note 2Maximum Fillet Height E Note 3 Note 3 Note 3Minimum Heel Fillet Height F > 50% H H (Note 4) H (Note 4)Solder Thickness G Note 5 Note 5 Note 5Height of solderable lead surface HLead Width WNote 1, Toe overhang will prevent the formation of an adequate heel fillet (Dim. F).Note 2, Side joint length is not required, but a properly wetted fillet shall be evident on any portion of a side joint that is visually inspectable.Note 3, Maximum fillet height is unspecified, but on Class 2 and Class 3 products solder shall not touch the package body.Note 4, “H” = height of solderable surface of lead, nominally 0.2 mm (0.008 in.).Note 5, A properly wetted fillet shall be evident.9.2.7 Terminal Soldering Terminals mounted in accordance with 6.2, and soldered to the printed board in unsupported holes or noninterfacial PTHs should exhibit evidence of good wetting to both the terminal flange/shoulder and land or conductive plane. The soldered connection shall (D1 D2 D3) meet the requirements shown in Table 9-17.Table 9-17 Terminal Soldering RequirementsCriteria Class 1 Class 2 Class 3A. Circumferential fillet and wetting - solder source side 270° 270° 330°B. Percentage of original solder source side land area covered with wetted solder 75% 75% 75%9.2.8 Connectors and Contact Areas The mating surface(s) of connectors or contact areas intended for electrical connection shall (D1 D2 D3) be free of contaminants or foreign material.