STDF: Why a consistent format for storing test data is essential

Without a consistent format, data could be stored in different ways, making it difficult to compare and analyze results from different tests.

A common question yieldHUB staff are asked at events is “what formats do you take?” The answer is: As long as the format is structured and consistent, we can take it. The most widely used wafer sort and final test format among our customers is STDF.

STDF stands for Standard Test Data Format which is a binary format used for storing test data from Automated Test Equipment (ATE) and a wide range of test types including parametric, functional, and high-frequency testing.

So why do engineers use STDF? Adopting a standard format, such as STDF, ensures that all data is stored in the same way, making it easy to share and analyze. The spec is available in the public domain.

Overall, a consistent format for storing test data is essential for efficient and accurate test engineering. It also allows for the storage of large amounts of data, therefore, making it possible to track the performance of individual devices over time.

To effectively use STDF for yield management, engineers at fabless semiconductor companies and IDMs should consider:

Using consistent naming conventions for STDF files: This can help to ensure that the data is well organized.
Using yield management software platforms to analyze STDF data: There are software platforms available like yieldHUB that can help you to analyze STDF data even at huge volume. These software platforms process the STDF data into a database for interactive analysis and often come with an API so you can programmatically access the data and statistics in other systems.

Overall, companies that have a consistent format such as STDF for storing test data can improve the accuracy and efficiency of their test engineering processes. yieldHUB recommends STDF but any format is also possible and we can work with you on integrating into our platform.

Speak to our friendly team of yield management experts today.

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