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| # | Part: | Description: | Manuf. | Package | Pins | T°min | T°max | PDF size |
| 1. |  74LS21 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 2. | 74LS21 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 3. | 74LS21 | Dual 4-input Positive AND Gates | Hitachi Semiconductor | HITACHI | - | - | - | 46 Kb |
| 4. | 74LS21 | DUAL 4-INPUT POSITIVE AND GATE | List of Unclassifed Manufacturers | ETC | - | - | - | 54 Kb |
| 5. | DM74LS21 | Dual 4-Input AND Gates | National Semiconductor | NSC | - | - | - | 126 Kb |
| 6. | GD74LS21 | DUAL 4-INPUT POSITIVE AND GATES | List of Unclassifed Manufacturers | ETC | - | - | - | 100 Kb |
| 7. | HD74LS21 | Dual 4-input Positive AND Gates | Hitachi Semiconductor | HITACHI | - | - | - | 46 Kb |
| 8. | HD74LS21 | Dual 4-input Positive AND Gates | Renesas Technology Corp | RENESAS | - | - | - | 53 Kb |
| 9. | SN74LS21 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 10. | SN74LS21D | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 11. | SN74LS21D | DUAL 4-INPUT AND GATE | Motorola, Inc | MOTOROLA | - | - | - | 123 Kb |
| 12. | 74LS21DC | DUAL 4-INPUT POSITIVE AND GATE | List of Unclassifed Manufacturers | ETC | - | - | - | 54 Kb |
| 13. | SN74LS21DE4 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 14. | SN74LS21DR | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 15. | SN74LS21DRE4 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 16. | 74LS21FC | DUAL 4-INPUT POSITIVE AND GATE | List of Unclassifed Manufacturers | ETC | - | - | - | 54 Kb |
| 17. | HD74LS21FPEL | Dual 4-input Positive AND Gates | Renesas Technology Corp | RENESAS | - | - | - | 53 Kb |
| 18. | SN74LS21N | DUAL 4-INPUT AND GATE | Motorola, Inc | MOTOROLA | - | - | - | 123 Kb |
| 19. | SN74LS21N | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 20. | SN74LS21N3 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
| 21. | SN74LS21NE4 | DUAL 4-INPUT POSITIVE-AND GATES | Texas Instruments | TI | - | - | - | 505 Kb |
