{"id":633,"date":"2025-10-21T09:15:00","date_gmt":"2025-10-21T00:15:00","guid":{"rendered":"https:\/\/www.seiken.co.jp\/english\/?p=633"},"modified":"2026-01-30T10:28:12","modified_gmt":"2026-01-30T01:28:12","slug":"silicon-wafer-and-wafer-testing-the-frontline-of-semiconductor-quality","status":"publish","type":"post","link":"https:\/\/www.seiken.co.jp\/english\/news\/633\/","title":{"rendered":"Silicon Wafer and Wafer Testing \u2014 The Frontline of Semiconductor Quality"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\"><strong>~The Crucial Role of Contact Probes~<\/strong><\/h3>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What Is a Silicon Wafer?<\/strong><\/h2>\n\n\n\n<p>A <strong>silicon wafer<\/strong> (also known as slice or substrate) is the foundation of nearly every semiconductor device. It is a circular, mirror-like plate sliced from a high-purity single-crystal silicon ingot, then polished to extreme smoothness. Wafer diameters typically range from a few inches up to 300 mm. On each wafer, identical circuit patterns called <em>dies<\/em> are formed in large arrays through photo-lithography and other semiconductor processes. Later, these dies are separated and packaged into the chips that power everything from smartphones to satellites.<\/p>\n\n\n\n<p>Basic terminology:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wafer<\/strong>: A circular substrate with multiple integrated circuits patterned on it.<\/li>\n\n\n\n<li><strong>Die<\/strong>: A single chip after separation from the wafer.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"774\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-1024x774.jpg\" alt=\"\" class=\"wp-image-641\" style=\"width:314px\" srcset=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-1024x774.jpg 1024w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-300x227.jpg 300w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-768x580.jpg 768w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-1536x1161.jpg 1536w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer.jpg 1597w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>What Is \u201cWafer Testing\u201d?<\/strong><\/h2>\n\n\n\n<p>Wafer testing is the process of electrically inspecting the chips <em>before<\/em> they are cut from the wafer. This step identifies defective circuits in advance, preventing unnecessary cost and time wasted on packaging non-functional chips.<\/p>\n\n\n\n<p>Testing is carried out using a <strong>probe card<\/strong> connected to a test equipment. The <strong>probes<\/strong> make contact with the wafer\u2019s pads to send and receive signals.<\/p>\n\n\n\n<p>Typical wafer-level inspections include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Continuity (open\/short) testing<\/li>\n\n\n\n<li>Basic power-on functional checks (<em>smoke tests<\/em>)<\/li>\n\n\n\n<li>Memory read\/write verification and analog IC measurements<\/li>\n\n\n\n<li>RF or high-current testing with specialized probe cards<\/li>\n<\/ul>\n\n\n\n<p>Each application demands unique requirements for <strong>accuracy, speed, and probe contact performance<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Relationship Between Test Equipment and Probes<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-flexible-table-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th style=\"width:30%\"><strong>Equipment \/ Component<\/strong><\/th><td><strong>Role<\/strong><\/td><\/tr><tr><th style=\"width:30%\"><strong>Wafer Prober<\/strong><\/th><td>Holds and aligns the wafer precisely with the probe card \u2014 the stage for testing.<\/td><\/tr><tr><th style=\"width:30%\"><strong>Probe Card<\/strong><\/th><td>Interface that consolidates many probes. Types include cantilever and vertical, chosen based on application. Variants exist for RF, high-current, or non-magnetic use.<\/td><\/tr><tr><th style=\"width:30%\"><strong>Contact Probe<\/strong><\/th><td>Spring-loaded pins that deliver consistent force and high durability during repeated testing cycles.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Key considerations:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Signal integrity<\/strong>: In RF applications, probe impedance and ground layout must be carefully designed.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Probes often endure millions of contact cycles in mass production.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"426\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-1024x426.jpg\" alt=\"\" class=\"wp-image-636\" style=\"width:733px;height:auto\" srcset=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-1024x426.jpg 1024w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-300x125.jpg 300w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-768x320.jpg 768w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-1536x639.jpg 1536w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-est-2048x852.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">*Prober designs vary by manufacturer, but their connection <br>with probe cards follows the same basic principle.<\/figcaption><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>Seiken\u2019s Strength \u2014 High-Reliability Probes \u00d7 Engineering Capability<\/strong><\/h2>\n\n\n\n<p>At <strong>Seiken<\/strong>, we integrate both <strong><a href=\"https:\/\/www.seiken.co.jp\/english\/products\/probe\/\" title=\"\">probe manufacturing<\/a><\/strong> and <strong><a href=\"https:\/\/www.seiken.co.jp\/english\/products\/probe_cards\/\" title=\"\">probe card<\/a> design<\/strong>, ensuring robust performance for every application.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Proven expertise in <strong>high-current, RF, and non-magnetic probes.<\/strong><\/li>\n\n\n\n<li>Prototyping available from just <strong>a single probe card.<\/strong><\/li>\n\n\n\n<li>Custom <strong>probe card layouts<\/strong> tailored to your specific test requirements<\/li>\n<\/ul>\n\n\n\n<p>Whether your process involves <strong>wafer-level testing, IC socket evaluation, or PCB-level inspection<\/strong>, Seiken delivers reliable contact solutions that safeguard measurement accuracy and product quality.<\/p>\n\n\n\n<p>Discover how Seiken\u2019s expertise can support your testing needs\u2014<strong><a href=\"https:\/\/www.seiken.co.jp\/english\/contact_us\/\" title=\"\">contact us<\/a> today to learn more.<\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"439\" src=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-fin-1024x439.png\" alt=\"\" class=\"wp-image-646\" style=\"width:497px;height:auto\" srcset=\"https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-fin-1024x439.png 1024w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-fin-300x129.png 300w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-fin-768x329.png 768w, https:\/\/www.seiken.co.jp\/english\/wp\/wp-content\/uploads\/2025\/10\/Wafer-fin.png 1295w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>~The Crucial Role of Contact Probes~ What Is a Silicon Wafer? A silicon wafer (also known as slice or substrat [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-633","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/posts\/633","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/comments?post=633"}],"version-history":[{"count":8,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/posts\/633\/revisions"}],"predecessor-version":[{"id":695,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/posts\/633\/revisions\/695"}],"wp:attachment":[{"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/media?parent=633"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/categories?post=633"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.seiken.co.jp\/english\/wp-json\/wp\/v2\/tags?post=633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}