| MC100LVEL51 | ON Semiconductor | 3.3V ECL Differential Clock D Flip-Flop |
| MC100LVEL51D | ON Semiconductor | 3.3V ECL Differential Clock D Flip-Flop |
| MC100LVEL51DR2 | ON Semiconductor | 3.3V ECL Differential Clock D Flip-Flop |
| MC100LVEL51DT | ON Semiconductor | 3.3V ECL Differential Clock D Flip-Flop |
| MC100LVEL51DTR2 | ON Semiconductor | 3.3V ECL Differential Clock D Flip-Flop |