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SN74HC166DR brand manufacturers: National Semiconductor, Twicea stock, SN74HC166DR reference price.National Semiconductor. SN74HC166DR parameters, SN74HC166DR Datasheet PDF and pin diagram description download.You can use the SN74HC166DR Logic - Shift Registers, DSP Datesheet PDF, find SN74HC166DR pin diagram and circuit diagram and usage method of function,SN74HC166DR electronics tutorials.You can download from the Twicea.