DP8303N 8-Bit Tri-State® bidirectional transceiver by National Semiconductor. Package: 20-DIP Download National Semiconductor DP8303N .pdf datasheet: Status: RNOS (Rare New Old Stock) being sold on ebay (April 2018) @ £19.89 to £17.65 each.... Our price for a tested item, a sensible £8.00 that's fair ! Individully tested components: YES RoHS compliant: no