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Part Average Testing

Being an entirely cloud based solution, MFG Vision’s PAT solution (“autoHUB”) lets you avoid program updates or updates to tester software. The reality is that it is expensive to update programs as it consumes engineering and tester resources so should be avoided when possible. And it is possible to completely avoid it when PAT is done in the cloud. Using a Web GUI, you just tell autoHUB which tests are for PAT. This triggers server side scripts to look after the whole process and report back on the PAT performance of your wafers and lots for approval and update of the wafer maps which are then sent on to assembly. This allows us to dramatically lower the true cost of Part Average Testing for wafer sort.

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Part Average Testing (or PAT) is required by automotive customers and also some other tier one electronics companies. The requirements for PAT testing are described in AEC – Q001. Some of our customers also use PAT for improving the reliability of non-automotive products.

The quality standard describes two approaches, “Static PAT Limits” and “Dynamic PAT Limits”. Both are included in autoHUB.

Static PAT Limits

In this case historical data is reviewed in order to set new test limits which are intended to remove (by failing) devices which are outside of the normal distribution but would have passed by being inside the specification limits. The algorithm for calculating these is given in the standard. MFG Vision have developed a software module which calculates static PAT limits in a few moments. These limits can then be implemented on the test floor.

Dynamic PAT Limits

Using Dynamic PAT Limits is preferable as the limits are calculated on the actual material being tested. This means that lot-to-lot variation is not an issue. There are two places in the supply chain that Dynamic PAT can be implemented, at Chip Probe and at Final Test.

Dynamic PAT at Chip Probe is very efficient and implementation is quicker and easier than at final test. MFG Vision’s solution for Dynamic PAT at probe is standard in autoHUB and can be included as an additional tool with any of the yieldHUB products.

AutoHUB is a trouble-free/low maintenance solution for implementing the AEC – Q001 requirements at probe. There are no program updates, separate DPAT limits for each site are set-up automatically and there is a full record of all limits applied. A report is provided per lot and each lot can be signed-off by engineering before the assembly maps are sent on.

Contact us today for more information.