Home › Forums › General Electronics › What is OA in OA79 Diode ? › Re: 1N in 1N4007 Diode June 25, 2014 at 3:37 pm #8900 Ligo GeorgeKeymaster 1NXXXX is an American Standard numbering system used for Semiconductor Devices which in now adopted globally. 1N means Single Junction semiconductor. 2N means Double Junction semiconductor. 4007 is the part number.
