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Datasheet Replacement Marking Code
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25LC128
SN74LS640N (3)SN74LS640 (13)SN74LS64 (53)SN74LS6 (123)SN74LS (904)SN74L (1223)SN74 (4991)SN7 (9)
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SN74LS640N

Transceiver, Inverting 1 Element 8 Bit per Element Push-Pull Output 20-PDIP
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SN74LS640NSR

Transceiver, Inverting 1 Element 8 Bit per Element Push-Pull Output 20-SO
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SN74LS640NE4

Transceiver, Inverting 1 Element 8 Bit per Element Push-Pull Output 20-PDIP
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