Chimicron is an independent distributor of electronic components. We have reliable sources of electronic components, only sell new & original products and offer 1 year warranty for our products. Buy the SN74LS31NS Rochester Electronics at chimicron.com. We have 1000 pieces of SN74LS31NS in stock available now. Submit an inquiry for SN74LS31NS or send an email to [email protected], we will contact you in 24 hours.