{"id":617,"date":"2016-09-02T16:42:58","date_gmt":"2016-09-02T16:42:58","guid":{"rendered":"http:\/\/www.semlab.com\/blog\/?p=617"},"modified":"2017-10-03T21:51:52","modified_gmt":"2017-10-03T21:51:52","slug":"tombstoning-of-smd-inductor","status":"publish","type":"post","link":"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/","title":{"rendered":"Tombstoning of SMD Inductor"},"content":{"rendered":"<p>Tombstoning is a well known issue for SMT soldering and is usually caught at post solder visual inspection.  However, at times the effect is a subtle lifting at one end of the component as was the case in this example of an SMD inductor.  The failure was a high resistance in the associated signal net that wasn&#8217;t detected until final assembly and testing of the product.<\/p>\n<p><a href=\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone1.png\" alt=\"Tombstone1\" width=\"1334\" height=\"1338\" class=\"alignnone size-full wp-image-618\" srcset=\"https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1.png 1334w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/8_3_300_300_Tombstone1-768x770.png 300w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1-100x100.png 100w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1-600x602.png 600w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1-150x150.png 150w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1-768x770.png 768w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone1-1021x1024.png 1021w\" sizes=\"auto, (max-width: 1334px) 100vw, 1334px\" \/><\/a><\/p>\n<p>This is a BSE SEM image of a microsection of the device as soldered on the PCBA.<\/p>\n<p><a href=\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone2.png\" alt=\"Tombstone2\" width=\"1336\" height=\"1330\" class=\"alignnone size-full wp-image-619\" srcset=\"https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2.png 1336w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-300x300.png 300w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-100x100.png 100w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-600x597.png 600w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-150x150.png 150w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-768x765.png 768w, https:\/\/www.semlab.com\/wp-content\/uploads\/2016\/09\/Tombstone2-1024x1019.png 1024w\" sizes=\"auto, (max-width: 1336px) 100vw, 1336px\" \/><\/a><\/p>\n<p>The high resistance was caused by a failure of the original solder reflow process to wet the termination, which caused &#8220;tomb stoning&#8221; of the inductor.<\/p>\n<p>Check out <a title=\"SEM Lab, Inc.\" href=\"http:\/\/www.semlab.com\" target=\"_blank\">SEM Lab, Inc.<\/a>\u00a0 to learn more.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tombstoning is a well known issue for SMT soldering and is usually caught at post solder visual inspection. However, at times the effect is a subtle lifting at one end of the component as was the case in this example of an SMD inductor. The failure was a high resistance in the associated signal net [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mo_disable_npp":"","ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-617","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tombstoning of SMD Inductor - SEM Lab Inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tombstoning of SMD Inductor - SEM Lab Inc.\" \/>\n<meta property=\"og:description\" content=\"Tombstoning is a well known issue for SMT soldering and is usually caught at post solder visual inspection. However, at times the effect is a subtle lifting at one end of the component as was the case in this example of an SMD inductor. The failure was a high resistance in the associated signal net [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\" \/>\n<meta property=\"og:site_name\" content=\"SEM Lab Inc.\" \/>\n<meta property=\"article:published_time\" content=\"2016-09-02T16:42:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-10-03T21:51:52+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone1.png\" \/>\n<meta name=\"author\" content=\"Ed Hare PhD\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ed Hare PhD\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\"},\"author\":{\"name\":\"Ed Hare PhD\",\"@id\":\"https:\/\/www.semlab.com\/old\/#\/schema\/person\/fe841085a5f591792d70aca10ca2a2e8\"},\"headline\":\"Tombstoning of SMD Inductor\",\"datePublished\":\"2016-09-02T16:42:58+00:00\",\"dateModified\":\"2017-10-03T21:51:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\"},\"wordCount\":121,\"commentCount\":3,\"image\":{\"@id\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/#primaryimage\"},\"thumbnailUrl\":\"http:\/\/semlab.com\/semlab.com\/2017\/wp-content\/uploads\/2016\/09\/Tombstone1.png\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\",\"url\":\"https:\/\/www.semlab.com\/old\/tombstoning-of-smd-inductor\/\",\"name\":\"Tombstoning of SMD Inductor - 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