SN74LS628NE4 SN74LS640-1DW SN74LS640-1N SN74LS640DWG4原装
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SN74LS640N SN74LS641-1DWG4 SN74LS641-1N SN74LS641N原装
贴片直插SN74LS684DWG SN74LS640DWG SN74LS640ML2 4
贴片直插SN74LS645-1N SN74LS640MR1 SN74LS641DWG 4
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