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FIGURE 52.14 Lead extension from component body, where (1) is solder bead, (2) is weld. L is the distance from the effective component body to the bend. (IPC)
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FIGURE 52.15 Example of physical damage to component after insertion. This is a defect condition and cause for rejection.(a) Axial lead component, (b) Chip component. (IPC)
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FIGURE 52.16 Radial leaded components spacing. Component is perpendicular and base is parallel to board. Acceptable clearance varies with Class. (IPC)
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52.4.2 SMT Placement Coplanarity is very important in the placement of SMT components with leads. Occasionally, lead preparation to form the leads of SMT components is necessary to achieve the proper coplanarity for manual or automatic placement of components on the PCB. Most times, however, the components are purchased packaged with leads prepared and ready to be automatically placed by pick-and-place equipment. Another critical parameter for all surface-mounted components is the accuracy of placement of the components onto the pads of the PCB. 52.4.2.1 Chip Components. Side overhang is acceptable up to one-half (one-quarter for Class 3) the width of the component end cap or PCB pad. End-cap overhang is not acceptable for all classes. The end-cap solder joint width is acceptable with a minimum solder joint length of one-half (three-quarters for Class 3) the component end cap or PCB land, whichever is less. A side solder joint length is not required; however, a properly wetted fillet must be evident. The maximum solder fillet height may overhang the land or extend onto the top of the end-cap metallization; however, the solder should not extend farther on the component body.
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The minimum solder fillet height must cover one-quarter the thickness, or height, of the component end cap for Class 3 but is required to be evident only for Classes 1 and 2. The component end cap must have overlap contact with the PCB pad. There is no minimum contact length specified see (see Fig. 52.17 and Table 52.1 for an example and list of specifications).
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FIGURE 52.17 Example placement and solder fillet for surface mount chip component. Evidence of overlap of contact (J) between the component termination and the land is required. (IPC)
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52.4.2.2 Metal Electrode Leadless Face (MELF) or Cylindrical Termination. Side overhang is acceptable up to one-quarter the diameter of the end cap. This dimension is different from the other SMT components due to the cylindrical feature of the component. End-cap overhang is not acceptable for all classes. The end-cap solder joint width is acceptable with a minimum solder joint length of one-half the diameter of the component end cap for Classes 2 and 3 but is required to be discernable only for Class 1. A side solder joint length must be a minimum of one-half (three-quarters for Class 3), but again is required to discernable only for Class 1. The maximum solder fillet height may overhang the land or extend onto the top of the end-cap metallization; however, the solder should not extend farther on the component body. The minimum solder fillet height must cover one-quarter the thickness, or height, of the component end cap for Class 3, and for Classes 1 and 2 the minimum solder fillet must exhibit proper wetting. The component end cap must have 75 percent of the cap dimension overlapping the land for Class 3 and 50 percent for Class 2. There is no minimum contact length specified for Class 1 (see Fig. 52.18 and Table 52.2). 52.4.2.3 Castellated Terminations. Side overhang is acceptable up to one-half (one-quarter for Class 3) of the castellation width. End overhang of the castellation is not acceptable for all classes. The castellation end solder joint width is acceptable with a minimum solder joint length of one-half (three-quarters for Class 3) of the castellation width (see Table 52.3). A minimum side solder joint length is required to extend beyond the edge of the component for all classes. The maximum solder fillet height is not a specified parameter for this type. The minimum solder fillet height must be 50 percent of the castellation height for Class 3 and 25 percent for Class 2. The only height requirement for Class 1 is that at least one fillet is visible.
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