NE531N high slew-rate op-amp distributed by RS Components. (re-branded signetics items) Package: 8-DIP Download Philips NE531N .pdf datasheet : Status: RNOS (Rare New Old Stock), ex RS components , Marked with RS legacy stock number: RS 305-872 Still a hightly regarded chip for instrumentation. *** Special price... this beats the lowest price we have been able to find advertised on the web **** RoHS compliant: no