Browse Prior Art Database

Enabling Package Mark Readability and Providing Unit Level Traceability Post Assembly on Packages with Integrated Heat Spreaders

IP.com Disclosure Number: IPCOM000018913D
Publication Date: 2003-Aug-20
Document File: 2 page(s) / 36K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that enables package mark readability to provide unit level traceability (ULT) after assembly. Benefits include an elimination of redundant marking on the integrated heat spreaders (IHS).

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Enabling Package Mark Readability and Providing Unit Level Traceability Post Assembly on Packages with Integrated Heat Spreaders

Disclosed is a method that enables package mark readability to provide unit level traceability (ULT) after assembly. Benefits include an elimination of redundant marking on the integrated heat spreaders (IHS).

Background

Currently, substrates are marked on the ink swatch area, pre-IHS assembly operations (see Figure 1). However, post IHS attach, the marking is covered with the IHS and therefore cannot be read. The IHS has to be remarked with the 2D matrix mark to provide the ULT. The IHS mark does not have the same content as the substrate mark, thus loosing any ULT info that existed up until the IHS attach. To ensure IHS traceability, the IHS would need to be pre-marked with the substrate mark content, and the correct lid placed on the correct substrate; however, this is not feasible for high volume manufacturing.

General Description

In the disclosed method, the IHS is designed with a cut out (notch) over the ink swatch area to make it visible (see Figure 2). The ink swatch is marked the same way as described earlier. In this case, the IHS does not need to be re-marked with the 2D matrix mark containing the lot related information (ULT). This maintains the ULT info throughout the whole assembly process, enabling technical and cost advantages to be realized.

Advantages

The following are advantages of the disclosed method:

1.      Ensures ULT during asse...