1 Стандарт пайки IPC. Ориентация элементов, формовка выводов при монтаже на

interfere with formation of the required solder connection (A).
•

Acceptable - Class 1
• Unsleeved component lead crossing an electrically noncommon conductor that does not violate electrical spacing (B).
Defect - Class 2,3
• Splitting and/or unraveling of sleeving (A).
• A component lead crossing an electrically noncommon conductor with a clearance of less than 0.5 mm [0.020 in] with no separating insulator (lead sleeving or surface coating) (B). Defect - Class 1,2,3
• Component leads and wires specified to have sleeving are not sleeved.
• Damaged/insufficient sleeving no longer provides protection from shorting.
• Sleeving interferes with formation of the required solder con nection.

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on all leads rests on the land
• Lead protrusion

Target

Acceptable

Defect

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of the component is in contact with the board surface.
•

Acceptable - Class 1,2
• The maximum clearance (C) between the component and the board surface does not violate the requirements for lead protrusion (see 7.5.3) or component height (H). (H) is a user determined dimension.
Acceptable - Class 3
• Clearance (C) between the component body and the board does not exceed 0.7 mm [0.028 in].

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the component body or weld bead above the land is

Table 7-4 Component to Board Clearance

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is in flat contact with the board's surface.
Acceptable - Class

Defect - Class 1,2,3
• Unbonded component body not in contact with mounting surface.

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