US 5,309,027 AGranted

Encapsulated semiconductor package having protectant circular insulators

AssigneeMotorola, Inc.

InventorJames P. Letterman, Jr.

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Abstract

The present invention includes a semiconductor package (20) that has a leadframe (10). An insulator (13) is mounted on a surface of a flag (11) of the leadframe (10) to insulate a portion of the leadframe (10) from the external environment. A semiconductor die (16) is also mounted on the flag (11), spaced away from the insulator (13). A portion of the leadframe (10), the semiconductor die (16), and a portion of the insulator (13) are encapsulated by a body (21) of the package (20). The body (21) also has an alignment hole (23) that extends from a surface of the body to the insulator (13), and exposes a portion of a surface of the insulator (13). In addition, the body (21) overlaps the insulator (13) and forms a seal to the insulator (13) protecting the leadframe (10) from the external environment.

Claims14

Dependent claims

An insulated semiconductor package comprising:

a leadframe having a flag wherein the flag has a surface;
a semiconductor die attached to the surface of the flag;
an opening through the flag, the opening having a diameter;
a plurality of circular insulators attached to the surface of the flag and positioned between the opening and the semiconductor die wherein the plurality of circular insulators are attached by an adhesive film, the plurality of the circular insulators having a diameter;
a body encapsulating the leadframe;
a mounting hole through the body wherein the mounting hole is concentric with the opening and has a diameter that is smaller than the diameter of the opening;
an alignment hole extending from a surface of the body to one of the plurality of circular insulators, the alignment hole having a diameter that is smaller than the diameter of the plurality of circular insulators so that the body overlaps the one of the plurality of circular insulators and exposes a portion of the one of the plurality of circular insulators;
an environmental seal at a junction of the body and the one of the plurality of circular insulators wherein the environmental seal seals the leadframe from an environment external to the body;
and
a plurality of leads extending from an edge of the body wherein the edge of the body is opposite an edge near the mounting hole.

7 more elements

Dependencies are inferred from the claim text.