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US 2005/0037544 A1Published application
Method of forming a leadframe for a semiconductor package
AssigneeSemiconductor Components Industries, LLC
InventorsGuan Quah, Darrell Truhitte
Life of this patent
Estimating the term…
Abstract
A method of forming a leadframe (10) provides blocking fulcrums (21,23) adjacent to the leads (12,13,14, and 15). During the process of encapsulating the leadframe (10), the blocking fulcrums (21,23) restrict encapsulating material from exiting the mold cavity and from attaching to the leads (12,13,14, and 15).
Claims20
A method of forming a leadframe for a semiconductor device comprising:
- forming a leadframe strip having a main panel and a plurality of cavity sections;
- forming a plurality of leads extending from the main panel a first distance into a cavity section of the plurality of cavity sections;
- forming three sides of each of the plurality of leads detached from the main panel and forming a proximal end of each of the plurality of leads attached to the main panel;
- and
- forming a blocking fulcrum extending from the main panel adjacent to a side of a lead of the plurality of leads and detached from the side of the lead of the plurality of leads and including terminating the blocking fulcrum no greater than a second distance from the cavity section.
2 more elements
A method of forming a semiconductor package from a leadframe comprising:
- providing the leadframe having leads and having a blocking fulcrum extending from a main panel of the leadframe toward a cavity section of the leadframe;
- encapsulating the cavity section of the leadframe to form a body;
- and
- moving the blocking fulcrum away from a plane of the leads and away from the body.
1 more element
A leadframe for a semiconductor package comprising:
- a leadframe strip having a main panel and a plurality of cavity sections;
- a plurality of leads having a proximal end attached to the main panel and having sides extending from the main panel a first distance into a cavity section of the plurality of cavity sections, the sides detached from the main panel;
- and
- a blocking fulcrum extending from the main panel toward the cavity section, the blocking fulcrum detached from the sides and terminating no greater than a second distance from the cavity section.
1 more element
Dependencies are inferred from the claim text.