Marking of electronic components, SMD Codes 51, 51**, 51***, 5103, 51031, 5108, 51117, 51123, 51123A, 51125, 5121*, 51216, 51219, 5121M, 51225, 5160x, 51716, 5173, 5193, 5198NL, 5199NL, 51A, 51AC30B, 51AC33, 51AC33B, 51Y. Datasheets 1.5SMC51AT3, AT5160TP