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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC58EEX датащи(PDF) 134 Page - STMicroelectronics |
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SPC58EEX датащи(HTML) 134 Page - STMicroelectronics |
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134 / 154 page  Package information SPC58EEx, SPC58NEx 134/154 DS11646 Rev 4 Figure 53. eLQFP176 leadframe pad design Table 78. eLQFP176 Symbol definitions Symbol Definition Notes aaa The tolerance that controls the position of the terminal pattern with respect to Datum A and B. The center of the tolerance zone for each terminal is defined by basic dimension e as related to Datum A and B. For flange-molded packages, this tolerance also applies for basic dimensions D1 and E1. For packages tooled with intentional terminal tip protrusions, aaa does not apply to those protrusions. bbb The bilateral profile tolerance that controls the position of the plastic body sides. The centers of the profile zones are defined by the basic dimensions D and E. — ccc The unilateral tolerance located above the seating plane where in the bottom surface of all terminals must be located. This tolerance is commonly know as the “coplanarity” of the package terminals. ddd The tolerance that controls the position of the terminals to each other. The centers of the profile zones are defined by basic dimension e. This tolerance is normally compounded with tolerance zone defined by “b”. Note: number, dimensions and positions of grooves are for reference only. |
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