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| 74HCT20D | Dual 4-input NAND gate | Philips Semiconductors | SOT108 | - | N/A | N/A | 74HCT20D datasheet (34K) |
| 74HCT20DB | Dual 4-input NAND gate | Philips Semiconductors | SOT337 | - | N/A | N/A | 74HCT20DB datasheet (34K) |
| 74HCT20N | Dual 4-input NAND gate | Philips Semiconductors | SOT27 | - | N/A | N/A | 74HCT20N datasheet (34K) |
| 74HCT20U | Dual 4-input NAND gate | Philips Semiconductors | N/A | - | N/A | N/A | 74HCT20U datasheet (34K) |
| 74HCT21D | Dual 4-input AND gate | Philips Semiconductors | SOT108 | - | N/A | N/A | 74HCT21D datasheet (33K) |
| 74HCT21DB | Dual 4-input AND gate | Philips Semiconductors | SOT337 | - | N/A | N/A | 74HCT21DB datasheet (33K) |
| 74HCT21N | Dual 4-input AND gate | Philips Semiconductors | SOT27 | - | N/A | N/A | 74HCT21N datasheet (33K) |
| 74HCT21NB | Dual 4-input AND gate | Philips Semiconductors | SOT27 | - | N/A | N/A | 74HCT21NB datasheet (33K) |
| 74HCT21U | Dual 4-input AND gate | Philips Semiconductors | N/A | - | N/A | N/A | 74HCT21U datasheet (33K) |
| 74HCT221D | Dual non-retriggerable monostable multivibrator with reset | Philips Semiconductors | SOT109 | - | N/A | N/A | 74HCT221D datasheet (250K) |