| 摘要 |
PURPOSE:To eliminate uplifting a pellet or shifting its position and to improve the positional accuracy of the pellet by a method wherein recessed parts and protruding parts are formed on a die pad on a package base and the recessed parts are used as grooves for venting use to the outside at a time when a solvent being contained in a paste is turned into gas at the time of heating and curing and is volatilized. CONSTITUTION:A plurality of quadrilateral protruding parts 11 are arranged on a die pad on a package base 5 in a lattice type at proper intervals interposing recessed parts 10 between them. At the time of pellet attachment, a paste 8 is applied on the die pad with the protruding and recessed parts 10 and 11 formed thereon by a potting technique. A pellet 7 is placed on the die pad and the paste 8 is heated and cured by a heating furnace. The parts 10 are used as grooves for venting use and a volatile solvent (gas) in the paste 8 can be released outside of the die pad at the time of pellet attachment.
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