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CHAPTER 2 PRINTED WIRING BOARD DESIGN
| Lead-type SMDs come in a variety of package shapes |
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Gull-wing type .... | SOP, SSOP, TSSOP, TSOP1, TSOP2, QFP, fine-pitch QFP, TQFP, LQFP |
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J-lead type ....... | SOJ, QFJ |
It is therefore extremely important to take the features of the SMD lead shape into consideration when designing the printed wiring board. It is also important to note that there may be slight differences between individual packages (such as pin dimensions, etc.) even if their product name is the same. The parameters regulating the mount pad dimensions are as follows. |
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the allowable margins for which are determined by the pattern design philosophy and the device's application. The following uses the package drawing of an 8 pin plastic SOP (7.62 mm (300)) to describe how to design the pin position precision and the printed wiring board mount pad dimensions. |
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