The SA602AN 8 pin dip; not surface mount. The SA602A has the same electrical specifications and pin out as NE612AN, NE602A and SA612A. Yes the manufacturer put two different numbers on the exact same part. Do you have a project calling for a SA612A, NE612, NE612A , NE612AN , NE602, NE602A, or NE602AN? Then you can use the SA602AN as a direct replacement pin for pin compatible. NE602 and NE602A are replaceable by the SA602AN.