IEC 62148-21-2021 pdf Fibre optic active components and devices – Package and interface standards – Part 21: Design guidelines of electrical interface of PIC packages using silicon fine-pitch ball grid array (S-FBGA) and silicon fine-pitch land grid array (S‑FLGA)
3.1 silicon fine-pitch ball grid array S-FBGA device composed of silicon die, dielectric layer(s) on the die, rerouting wires from the die pads to outer balls on the dielectric layer(s), and outer balls with heights more than 0,1 mm 3.2 silicon fine-pitch land grid array S-FLGA device composed of silicon die, dielectric layer(s) on the die, rerouting wires from the die pads to outer lands on the dielectric layer(s), and outer lands with heights of 0,1 mm or less
4 Terminal position numbering When a package is viewed from the terminal side with the index corner in the bottom left corner position, terminal rows are lettered from bottom to top starting with A, then B, C…, AA, AB, etc.; whereas terminal columns are numbered from left to right starting with 1. Terminal positions are designated by a row-column grid system and shown as alphanumeric identification, for example A1, B1. The letters I, O, Q, S, X and Z shall not be used for naming the terminal rows. 5 Code of package nominal dimensions A code of package nominal dimensions is defined as the combination of package length E and width D, which are shown to the second decimal place in millimetres. 6 Symbols and drawings Figure 1 shows the dimensions of the package and the outline of the electrical interface for S- FBGA and S-FLGA. Figure 1 also shows the dimensions of the optical terminal area and its guard band area. The electrical terminal is freely allocated to the terminal positions defined by the cross points of the row-column grid numbers, as long as its position is outside of the optical terminal guard band area. The optical interface shall be designed within the optical terminal area. Figure 2 and Figure 3 indicate the mechanical gauge drawing and its array of electrical terminal existence area. Figure 2 shows the electrical terminal existing area referred to data S, A and B. Figure 3 shows the electrical terminal existing area referred to datum S .
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