{"id":1546,"date":"2017-08-30T08:00:55","date_gmt":"2017-08-30T15:00:55","guid":{"rendered":"http:\/\/www.autodesk.com\/products\/eagle\/blog\/?p=1546"},"modified":"2023-09-25T11:36:20","modified_gmt":"2023-09-25T18:36:20","slug":"need-know-rohs","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/need-know-rohs\/","title":{"rendered":"What You Need to Know About RoHS"},"content":{"rendered":"<h2 class=\"wp-block-heading\" id=\"its-more-than-being-lead-free-what-you-need-to-know-about-rohs-as-an-electronics-designer\">It\u2019s More Than Being Lead Free: What You Need to Know About RoHS as an Electronics Designer<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">We generate over 40 million tons of electronic waste every year, and only 12.5% of that is recycled. Where does the rest end up? On the doorstep of some third-world country. The problem just isn\u2019t the waste though, it\u2019s what the waste does to our environment, and ultimately our health. Discarded electronics mix with acid rain, and there goes lead into a community\u2019s water supply. But what are we to do? As a society, we use electronics and then throw them away with little regard for where they end up. This is why RoHS was made a law in Europe, to keep hazardous materials out of landfills once and for all. Here\u2019s what you need to know about it as an electronics designer. <\/span><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"what-is-rohs\">What is RoHS?<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">The Restriction of Hazardous Substances, or RoHS, became law in Europe in 2003 and restricts the use of hazardous substances in electronics after July 1, 2006. However, any repaired parts, equipment, or inventories marketed before 2006 are exempt from this law. The restricted substances that RoHS govern&nbsp;includes:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Lead (Pb)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Mercury (Hg)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Cadmium (Cd)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Hexavalent Chromium (CR6+)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Polybrominated Biphenyls (PBB)<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Polybrominated Diphenyl Ether (PBDE)<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">Of these six, lead gets the most attention in the world of electronics manufacturing, and for a good reason. In the past, lead was used in nearly all solder to attach components to bare boards during assembly, and the most common surface finish before RoHS arrived contained 40% lead.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1548\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/lead-free-hasl-pcb.jpg\" alt=\"lead-free-hasl-pcb\"\/><figcaption class=\"wp-element-caption\"><em>HASL is one of the most common lead-based PCB finishes. (<a href=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/tin-whiskers-pcb-soldering-issue\/\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">These days, everything has changed in the world of electronics manufacturing. You might be hard pressed to find a component that is available in lead, and there\u2019s a variety of lead-free finishes to choose from for your next design project. But what does all of this mean for you, the electronics designer, and your manufacturer?<\/span><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"rohs-and-electronics-manufacturing\">RoHS and Electronics Manufacturing<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Of the six restricted substances in RoHS, the removal of lead has presented the greatest challenge for electronics manufacturers. Why?<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"higher-melting-temperatures\"><b>Higher Melting Temperatures<\/b><\/h3>\n\n\n<p><span style=\"font-weight: 400;\">Lead-free solder requires a higher melting temperature at 441\u00b0F, compared with a traditional tin\/lead solder which melts at 356\u00b0F. Components also need to be able to withstand this higher temperature which can completely change how they\u2019re designed and manufactured.<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"mixed-processes\"><b>Mixed Processes<\/b><\/h3>\n\n\n<p><span style=\"font-weight: 400;\">Since lead and lead-free boards require completely different temperatures, this also requires separate manufacturing processes. This can add up to an enormous investment in machinery when your local fab house has to operate two manufacturing lines, one for leaded and one for non-leaded electronics.<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"supply-chain-woes\"><b>Supply Chain Woes<\/b><\/h3>\n\n\n<p><span style=\"font-weight: 400;\">Removing lead doesn\u2019t just affect the producers of electronic equipment. The line of responsibility trickles down to where materials and source from, and from who. These days you\u2019ll typically find certificates of compliance as a mandatory requirement from any and all electronic supplier doing business with a producer.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">RoHS affects nearly all aspects of the electronics manufacturing process. Digging a little deeper into the manufacturing workflow, you\u2019ll find RoHS influencing nearly every step of the production of your PCB, including:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>Board finish<\/b><span style=\"font-weight: 400;\">. Most bare circuit boards are now finished with a lead-free coating. There are a ton of varieties to choose from, including ENIG, immersion metal, and lead-free HASL. <\/span><\/li>\n\n\n\n<li><b>Component assembly<\/b><span style=\"font-weight: 400;\">. Lead-free solder requires a higher temperature to bake components onto bare boards, which can have a huge effect on which parts you choose at design time.<\/span><\/li>\n\n\n\n<li><b>Shelf life<\/b>. Boards manufactured with lead-free solder and finishes typically have a shorter lifespan, thanks in part to higher moisture sensitivity. This can be a strong consideration for applications that need to last years or decades in the field in extreme conditions.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1549\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/671125main_msl20110519_PIA14156.jpg\" alt=\"mars-rover\"\/><figcaption class=\"wp-element-caption\"><em>The PCB on the Mars Rover will need to have a shelf life in the decades, not just years. (<a href=\"https:\/\/www.nasa.gov\/centers\/ames\/events\/2012\/ames-curiosity.html\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"the-electronics-designer-and-rohs\">The Electronics Designer and RoHS<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">By now you might be wondering, what does all of this RoHS stuff have to do with me, the designer? If a manufacturer has to meet RoHS requirements, won\u2019t they just choose a lead-free finish and make sure they\u2019re using only lead-free parts? Not quite. Unless you want your board to get held up with unnecessary production delays, then RoHS introduces a ton of new variables to consider in your design process, including:<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"verifying-your-components\">Verifying Your Components<\/h3>\n\n\n<p><span style=\"font-weight: 400;\">Before your board is ever manufactured, you the designer are responsible for picking parts that are RoHS compliant. Thankfully most if not all component distributors clearly identify whether a component is RoHS compliant on their website. For example, over at Digikey, you\u2019ll notice a green leaf symbol next to each part in the search results. When you view the specs for a specific part, there\u2019s also a <\/span><b>Lead Free Status\/RoHS Status<\/b><span style=\"font-weight: 400;\"> at the top of the page to guide your part choice decision.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/rohs-compliant-digikey-1.png\" alt=\"rohs-compliant-digikey\"\/><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">In addition to choosing RoHS compliant components, you also need to consider whether your parts can survive the higher temperature required for melting lead-free solder. For temperature sensitive parts like MEMs, switches, membranes, and LEDs, we recommend making notes in your Bill of Materials (BOM) for your assembly house, so they know up front about the temperatures constraints. <\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"selecting-your-board-finish\">Selecting Your Board Finish<\/h3>\n\n\n<p><span style=\"font-weight: 400;\">You\u2019ll also need to be in charge of selecting a lead-free finish for your PCB, and there\u2019s a ton of options to choose from. This can be a challenging decision to make, as there is no universal \u201cbest\u201d option out there. What you\u2019ll find is that every finish has its unique advantages and disadvantages, which need to be balanced with your unique design requirements. The most popular lead-free surface finishes to consider includes:<\/span><\/p>\n\n\n<h4 class=\"wp-block-heading\" id=\"enig\">ENIG<\/h4>\n\n\n<p><span style=\"font-weight: 400;\">Electroless Nickel Immersion Gold is made from a bottom layer of nickel with a thin layer of gold on top. This top layer of gold acts as the protective coating of the nickel.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large wp-image-1281 size-full\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/07\/electroless-nickel-immersion-gold-pcb.jpg\" alt=\"electroless-nickel-immersion-gold-pcb\"\/><figcaption class=\"wp-element-caption\"><em>Electroless Nickel Immersion Gold surface finish. (<a href=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/tin-whiskers-pcb-soldering-issue\/\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Advantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Has a longer shelf life than other finishes.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Pads and tracks are uniformly flat and square shaped, which makes this finish ideal for finely-pitched surface-mount components.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Can be touched with your bare hands without tarnishing the finish. <\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">Disadvantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">More expensive when compared to other finishes and cannot be reworked. <\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Requires more solder to complete a joint because the finish isn\u2019t pre-tinned. <\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Increased susceptibility to Signal Loss (RF).<\/span><\/li>\n<\/ul>\n\n\n<h4 class=\"wp-block-heading\" id=\"osp\">OSP<\/h4>\n\n\n<p><span style=\"font-weight: 400;\">Organic Solderability Protectants covers the copper surface of a board with a very thin organic compound layer. This water-based compound is a well known, environmentally friendly finish option.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large wp-image-1280 size-full\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/07\/osp-entek-pcb.jpg\" alt=\"osp-entek-pcb\"\/><figcaption class=\"wp-element-caption\"><em>Organic Solderability Protectants surface finish. (<a href=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/tin-whiskers-pcb-soldering-issue\/\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Advantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Simple application process with a uniform finish.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Provides a flat and reworkable finish for finely-pitched surface-mount components. <\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Costs less than other surface finishes like ENIG.<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">Disadvantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Has a limited shelf life since it\u2019s a water-based, organic compound.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Not as durable as other finishes, which presents a challenge when undergoing multiple reflow cycles.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">No way to measure the thickness of OSP and can leave exposed copper after application.<\/span><\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"immersion-metal\">Immersion Metal<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Immersion metal comes in two forms, tin or silver. Boards that have their components assembled by machine will typically use this surface finish. <\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1551\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/IMM-SILVER-PCB-Finish.jpg\" alt=\"IMM-SILVER-PCB-Finish\"\/><figcaption class=\"wp-element-caption\"><em>Immersion silver surface finish. (<a href=\"http:\/\/www.mclpcb.com\/products-and-services\/pcb-surface-finishes-types\/\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Advantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Provides a simple and cost effective application process. <\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Has a uniform and measureable height.<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">Disadvantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Tarnishes quickly when touched by bare hands, making it not ideal for hand assembly.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Coating is typically thin, leading to issues with long-term durability.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Possible formation of non-solderable alloys and oxidation (rust).<\/span><\/li>\n<\/ul>\n\n\n<h4 class=\"wp-block-heading\" id=\"leadfree-hasl\">Lead-Free HASL<\/h4>\n\n\n<p><span style=\"font-weight: 400;\">Lead-free HASL, or Hot Air Solder Levelling, is the most popular lead-free finish available. This application is applied by dipping a board into molten solder and then blowing off any excess solder with hot-air knives. <\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1552\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/circuit-board-with-pb-free-hasl.jpg\" alt=\"Lead-free-HASL\"\/><figcaption class=\"wp-element-caption\"><em>Lead-free HASL surface finish. (<a href=\"http:\/\/blog.epectec.com\/why-is-pb-free-hasl-a-hassle\">Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Advantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Generally the cheapest finish available, ideal for general-purpose boards.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Pad wetting is faster and more uniform than other finishes. <\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Delamination issues and outgassing issues are easier to spot before assembly.<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">Disadvantages<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400;\">Surface pads are slightly rounded after the hot-air finish, making SMD parts not lay as flat as they would on an ENIG board.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Possibility of delamination and warpage due to higher processing temperatures.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400;\">Non-uniform application can provide an uneven work surface for component assembly.<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">When working with your manufacturer, it\u2019s important to not just ask for a lead-free finish. Instead, go the extra mile and confirm that your fab house is using finish materials that can handle multiple passes through an oven at higher temperatures, all while meeting your specific component temperature requirements.<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"minding-your-moisture-sensitivity\">Minding Your Moisture Sensitivity<\/h3>\n\n\n<p><span style=\"font-weight: 400;\">All RoHS compliant components will come in a moisture protective package with an expiration date. If you end up using an expired component past its expiration date, then it\u2019s likely to be damaged during the fabrication process due to expanding water vapor. If you\u2019re planning on sending components to your assembly house, then be mindful of both the integrity of your moisture protective packaging and also the listed expiration. You\u2019ll need to let your assembly house know about any opened or expired parts so they can bake the components to remove any excess moisture.<\/span><\/p>\n\n\n<h3 class=\"wp-block-heading\" id=\"documenting-your-board\">Documenting Your Board<\/h3>\n\n\n<p><span style=\"font-weight: 400;\">It\u2019s important to always make a note of non-RoHS specific attributes for your design on both your assembly and bare board drawing. Since RoHS is now the norm instead of the exception, this makes it much easier for your manufacturer and fabricator to choose the right materials and processes for your design. For example, the fabrication notes in the image below have a specific callout about the required finish. <\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1553\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/2017-08-28_18-13-15.png\" alt=\"pcb-file-note-enig\"\/><figcaption class=\"wp-element-caption\"><em>Here\u2019s a PCB drawing note that documents surface finish requirements.<\/em><\/figcaption><\/figure>\n\n\n<h3 class=\"wp-block-heading\" id=\"adding-design-guidelines\">Adding Design Guidelines<\/h3>\n\n\n<p><span style=\"font-weight: 400;\">The guidelines we\u2019ve recommended so far won\u2019t have much of an impact on your PCB layout process. This is good news, as most traditional PCB layout methods will transfer seamlessly over to RoHS compliant boards. However, we do recommend tenting (solder mask fully enclosed over the via opening) both sides of a via hole on your layout to avoid any outgassing during the high-temperature assembly process. You can also avoid the popcorning effect on moisture-sensitive components like BGAs and PBGAs with an aggressive via fan-out pattern.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1554\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/tumblr_inline_mm6qgpJqbG1qz4rgp.jpg\" alt=\"nicely-tented-via\"\/><figcaption class=\"wp-element-caption\"><em>A nicely tented via.<\/em><\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"its-more-than-lead-free\">It\u2019s More Than Lead Free<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">RoHS compliance is the norm in the electronics design and manufacturing industry. If you\u2019re a hobbyist, you most likely won\u2019t be worrying about RoHS. However, the minute you start working on a project that will be produced and marketed in Europe you\u2019ll need to make sure your product is RoHS compliant. Your manufacturer will be able to provide a certificate of compliance if your product requires it, and you\u2019ll also find all RoHS compliant products with their own unique label. There\u2019s no specific labeling standard, so expect some variations.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large size-full wp-image-1555\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/eagle\/2017\/08\/rohs_compliant.jpg\" alt=\"rohs_compliant\"\/><figcaption class=\"wp-element-caption\"><em>RoHS compliant logos come in a variety of shapes and sizes.<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">At the end of the day, RoHS compliance doesn&#8217;t just fall into the hands of your manufacturer. You need to be on top of choosing lead-free components, selecting the right lead-free finish, and adding all the necessary details in your documentation notes to make your manufacturer&#8217;s life easier. It\u2019s a team effort here, between you and your manufacturer to make the world a less toxic place. <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Ready to design your first RoHS compliant PCB? <\/span><a href=\"https:\/\/www.autodesk.com\/products\/eagle\/free-download\"><span style=\"font-weight: 400;\">Try Autodesk EAGLE for free today!<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>RoHS, you\u2019ve likely heard about it, but did you know that it&#8217;s more than just being lead free? Learn what you need to know about this law and how it affects your electronic design process. <\/p>\n","protected":false},"author":2425,"featured_media":1547,"menu_order":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[286,434],"tags":[],"coauthors":[],"class_list":["post-1546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eda","category-eagle","dhig-theme--light"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What You Need to Know About RoHS | EAGLE | Blog<\/title>\n<meta name=\"description\" content=\"Learn what you need to know about the Restriction of Hazardous Substances (RoHS) to have a RoHS-compliant electronics design made.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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