| 摘要 |
PURPOSE:To lengthen intruding paths of water content and to improve the humidity resistance by a method wherein the lengths of tab-suspension leads are made larger by forming a tab in a longitudinal form in the direction intersection orthogonally to the tab-suspension leads. CONSTITUTION:In a lead frame consisting of outer frames 2 and 3, a pair of tabsuspension leads 4 and 5, a tab 6, outer leads 9 and 10 and inner leads 11 and 12, the tab 6 is formed in a longitudinal form in the direction intersecting orthogonally to the leads 4 and 5, that is, in the relation if the length L>the W of the tab 6. Whereupon, as the distances form positions, where the leads 4 and 5 are cut on the side surfaces of a sealing material, to the tab 6, in other words to a semiconductor chip which is fixed on the tab 6 become larger, the paths of water content which is liable to intrude along the leads 4 and 5 become larger. As a result, the intrusion of water content is reduced. |
