CHAPTER 2 PRINTED WIRING BOARD DESIGN
2.1 Lead-type SMDs
2.1.1 Tolerance of package dimensions
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The tolerance described in the package drawings of an 8 pin plastic SOP (7.62 mm (300)) is explained below. |
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| Figure 2-1. Package Drawing of Plastic SOP (7.62mm(300)) |
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The precision of the package pins in this diagram is guaranteed from the positional tolerance indicated by the logically accurate dimensions (dimension of square circumference: pin pitch), pin width/thickness tolerance, and pin position variation range. |
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[ Logically accurate dimensions ]
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[ Pin width/thickness tolerance ]
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[ positional tolerance: indicating the range of shift of the pin center position ]
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