SYDNEY, April 18 (Reuters) - South Korea's LG Electronics has mandated investment banks to work on a 3-year and 5-year dollar bond deal, according to a term sheet seen by Reuters on Thursday.

The 3-year bond has an initial price guidance of 3 year Treasuries plus 135 basis points, the term sheet showed.

The 5-year sustainable bond guidance is at 5 year Treasuries plus 150 basis points. (Reporting by Scott Murdoch; Editing by Himani Sarkar)