SN74LS21DR и другие
| Компонент | Описание | Производитель | |
| SN74LS21D | DUAL 4-INPUT AND GATE |
Motorola, Inc |
 |
| SN74LS21D | DUAL 4-INPUT POSITIVE-AND GATES |
Texas Instruments |
|
| SN74LS21DE4 | DUAL 4-INPUT POSITIVE-AND GATES |
Texas Instruments |
|
| SN74LS21DR | DUAL 4-INPUT POSITIVE-AND GATES |
Texas Instruments |
|
| SN74LS21DRE4 | DUAL 4-INPUT POSITIVE-AND GATES |
Texas Instruments |
|