max303The single-pole double throw (SPDT) MAX303 has two NO and two normally closed (NC) poles. All three parts offer low on resistance (less than 35Ω), guaranteed to match to withinMAX303 Datasheet : Precision, Dual, Hh-Speed Analog Switches, MAX303 PDF VIEW Download Maxim Integrated, MAX303 7 page Datasheet PDF, Pinouts, Data Sheet,