{"id":654,"date":"2025-11-28T16:49:14","date_gmt":"2025-11-28T07:49:14","guid":{"rendered":"https:\/\/www.seiken.co.jp\/english\/?p=654"},"modified":"2025-11-28T17:00:10","modified_gmt":"2025-11-28T08:00:10","slug":"bare-die-dice-the-starting-point-of-semiconductor-chips","status":"publish","type":"post","link":"https:\/\/www.seiken.co.jp\/english\/news\/654\/","title":{"rendered":"Bare Die (Dice): The Starting Point of Semiconductor Chips"},"content":{"rendered":"\n

Why Test Fixtures and Probes Are Essential Before Packaging<\/em><\/h3>\n\n\n\n

What Is a Bare Die<\/strong> (Die<\/strong>)?<\/strong><\/h2>\n\n\n\n

A die is the smallest functional semiconductor unit created on a wafer. After the wafer is cut (diced<\/em>), each circuit becomes an individual die. When the chip remains unpackaged, it is referred to as a bare die<\/strong>.<\/p>\n\n\n\n

Testing at the die level is critical to verify electrical characteristics, ensure long-term reliability, and screen out defective chips before costly packaging steps.<\/p>\n\n\n

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There are three common dicing processes: blade dicing (mechanical cutting), laser dicing, and plasma dicing (dry etching).<\/figcaption><\/figure>\n<\/div>\n\n
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Bare die (chip before packaging)<\/figcaption><\/figure>\n<\/div>\n\n\n

Common Measurements at the Die Level<\/strong><\/h2>\n\n\n\n

Die Probing<\/strong>:<\/h4>\n\n\n\n

The die is mounted on a chuck, and test probes make direct contact for electrical inspection.<\/p>\n\n\n\n

Die Sorting<\/strong>:<\/h4>\n\n\n\n

Good dies are separated from defective ones before assembly. This is particularly important for multi-chip modules and high-value devices, where one faulty die could compromise the entire product.<\/p>\n\n\n\n

Fixtures and Contact Probes for Die Testing<\/strong><\/h2>\n\n\n\n
Equipment \/ Fixture<\/strong><\/th>Role<\/strong><\/td><\/tr>
Die Handler<\/strong><\/th>Transfers bare dies and holds them for electrical inspection. Internal sockets often integrate spring probes.<\/td><\/tr>
Die Prober \/ Micro Prober<\/strong><\/th>Precisely aligns fine-pitch pads on small dies for accurate electrical contact.<\/td><\/tr>
IC Test Socket<\/a><\/strong><\/th>Provides temporary connection for bare dies or small packages. Spring probes allow repeated insertion, making it ideal for mass evaluation.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Across all these tools, spring contact probes<\/a><\/strong> remain the critical interface for stable, repeatable measurements.<\/p>\n\n\n

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Technical Challenges in Die Testing<\/strong><\/h2>\n\n\n\n