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SN74HCT540NE4 SN74HCT540NG4 SN74HCT541 SN74HCT541A SN74HCT541ADBR SN74HCT541ANS SN74HCT541ANSR SN74HCT541APW SN74HCT541APWG4 SN74HCT541APWR