SANTA CLARA, Calif.--(BUSINESS WIRE)--Affymetrix Inc., (Nasdaq:AFFX) announced today that it has entered into an agreement to sell $105 million aggregate principal amount of unsecured 4.00% Convertible Senior Notes due 2019. Affymetrix also has granted the underwriters an option to purchase up to $10 million aggregate principal amount of additional notes on the same terms and conditions, solely to cover over-allotments, if any.