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Top Mark Convention - Wafer Fab Facility Code
| Symbol | Format | Description | Valid Characters Used for &U |
| &U | U | Wafer Fab Facility Code | 2, 3, 4, 6, 7, 8, 9, A, B, C, D, F, G, H, K, L, M, P, T, U, W, R, X, Y, Z |
Note: To learn which facilities those characters stand for, please contact Fairchild Customer Support.
