PCB Develop Process at BEST Inc

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href="https://www.solder.net/technical-info/develop-profile/" target="_self">Develop Profile</a>  <a class="btn" title="Part Removal" href="https://www.solder.net/technical-info/part-removal/" target="_self">Part Removal</a>  <a class="btn" title="Site Preparation" href="https://www.solder.net/technical-info/site-preparation/" target="_self">Site Preparation</a>  <a class="btn" title="Placement" href="https://www.solder.net/technical-info/bga-replacement/" target="_self">Placement</a> <a class="btn" title="Reflow" href="https://www.solder.net/technical-info/part-reflow/" target="_self">Reflow</a> <a class="btn" title="Inspection" href="https://www.solder.net/technical-info/inspection" target="_self">Inspection</a></p> <br /> <h5>Proper PCB Preheating</h5> <p>One of the keys to insuring a proper reflow profile is getting to and maintaining the proper preheat temperature. This is accomplished with a PCB preheater which heats the board to between 75º and 125º C prior to the application of directed heat to the part area requiring rework. In some cases higher end equipment featuring multiple pre-heating zones will minimize the chances of part or board warpage. In some cases very large formate BGA rework systems are required in order to minimize warpage when there is  large surface area. This part of the rework process is a critical  as when as it minimizes PCB warpage during component removal while at the same time limiting the thermal shock to the PCB. The maximum temperature is determined by the thermal characterisitics and materials used in the construction of the PCB. In order to maintain the integrity of the PCB laminate the maximum preheat temperature is set approximately 10ºC or below the Tg (glass transition temperature) of the PCB material. Higher thermal preheat temperatures minimize the potential thermal distortion and shock to the PCB during the reflow process.</p> <h5>ESD Safe Work Areas</h5> <p>BGAs should be handled in ESD safe work areas in order to prevent damage to sensitive components from electrostatic discharges. These areas must be designed and maintained to prevent ESD damage.</p> <h5>Proper Handling and Storage of ESD Sensitive Devices and PCBs</h5> <p>The following practices should be adhered to when working with BGA components and PCB assemblies:</p> <p>PCBs should be handled at properly designated work areas only.</p> <p><img style="margin: 0px 0px 0px 10px; float: right;" src="https://cdn11.bigcommerce.com/s-lfvlkxkhv1/product_images/uploaded_images/proto3.jpg" alt="PROPER HANDLING AND STORAGE OF ESD SENSITIVE DEVICES AND PCBS" width="250" height="188" />Designated ESD safe work areas must be checked periodically to ensure their continued safety from ESD. The areas should be monitored for the following:</p> <ul> <li>Proper grounding methods.</li> <li>Static dissipation of work surfaces.</li> <li>Static dissipation of floor surfaces.</li> <li>Designated work areas must be kept free of static generating materials such as Styrofoam, vinyl, plastic, fabrics or any other static generating materials.</li> <li>Work areas must be kept clean and neat in order to prevent contamination of the work area.</li> <li>Circuit board assemblies should be handled by the edges. Avoid touching the circuits or components.<em><br /></em></li> <li>Components should be handled by the edges when possible. Avoid touching the component leads.</li> <li>When not being worked on, sensitive components and circuit boards must be enclosed in shielded bags or boxes. There are three types of ESD protective enclosure materials including: <br />Antistatic - Provides antistatic cushioning for electronic assemblies. <br />Static Shielding - Prevents static electricity from passing through the package. <br />Static Dissipative - An "over-package" that has enough conductivity to dissipate any static buildup.</li> <li>Whenever handling a circuit board assembly the operator must be properly grounded by one of the following:</li> <li>Wearing a wrist strap connected to earth ground.</li> <li>Wearing 2 heel grounders and have both feet on a static dissipative floor surface.</li> <li>Stacking of circuit boards and assemblies should be avoided to prevent physical damage. Special racks and trays are provided for handling.<em><br /></em></li> </ul> <h5>MSD CONTROL-PREPARATION OF AREA ARRAY DEVICES</h5> <p>All moisture sensitive devices should be handled as per IPC/JEDEC J-STD-020A and IPC JEDEC J-STD-033 standards.</p> <h5>ADJACENT COMPONENTS</h5> <p>Areas near the area array device being reworked require their temperature to be controlled and limited to less than 150ºC or to the manufacturer's specifications paying special attention to "heat sensitive" devices such as connectors, components with a plastic housing or similar lower melt temperature components. Other components such as crystals, cameras and glass diodes will also need to be protected from too high a heat source during the BGA removal process. Heat shielding may be required in some cases to prevent component damage. Other methods may need to be employed in order to prevent underfills from "squirting out" solder, conformal coatings may need to be first removed so they do not push solder joints around during reflow and mirrored BGA locations may need to be protected from higher temperatures to minimize the impact in the reworked area.</p> </div> </div> </div> </div>  </div> </div> </div> </div> </div> <div id="modal" class="modal" data-reveal data-prevent-quick-search-close> <a href="#" class="modal-close" aria-label="Close" role="button"> <span aria-hidden="true">×</span> </a> <div class="modal-content"></div> <div class="loadingOverlay"></div> </div> </div> <footer class="footer-top"> <div class="container"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-3 col-lg-3"> <div class="tips margin-b-30"> <div class="underline_heading"> <h3>Soldering Tips</h3> </div> <amp-iframe sandbox="allow-scripts allow-same-origin" width="200" height="100" src="https://www.youtube.com/embed/CGnt2vCAjfQ" 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//}); Swal.fire( 'Thank you', 'BEST will be supplying your request shortly!', 'success' ).then((result) => { location.reload(); }) // setTimeout(function(){ // location.reload(); // },2000); } } }); } }); }); </script>  <script src="https://apps.elfsight.com/p/platform.js" defer></script> <div class="elfsight-app-c1f02ee5-ea7f-4df9-8d38-5e42e91b119e"></div> <script> // document.getElementById('form_download').setAttribute("download", "Best Credit Application.pdf"); // document.getElementById("myH1").setAttribute("class", "democlass"); // $('#form_download').attr('download'); $("#form_download").click(function(){ fetch("https://store-lfvlkxkhv1.mybigcommerce.com/content/Best%20Credit%20Application.pdf", { method: 'GET' }).then(resp => resp.blob()) .then(blob => { const url = window.URL.createObjectURL(blob); const a = document.createElement('a'); a.style.display = 'none'; a.href = url; a.download = "Best Credit Application"; // the filename you want document.body.appendChild(a); a.click(); 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$(".navPages-item span").click(function(){ $(this).parent().find(".menu_dropdown").toggle(); $(this).parent().toggleClass("active_menu"); if($(this).parent().hasClass("active_menu")) { if($(this).parent().find(".menu_dropdown").attr("style") != '') { $(this).parent().find(".menu_dropdown").toggle(); } } if($(this).parent().find(".menu_dropdown").attr("style") == '') { $(this).find(".icon-visible").first().removeClass("fa-caret-down"); $(this).find(".icon-visible").first().addClass("fa-caret-up"); } else{ $(this).find(".icon-visible").first().removeClass("fa-caret-up"); $(this).find(".icon-visible").first().addClass("fa-caret-down"); } }); $(".submenu_dropdown_item span").click(function(){ $(this).parent().find(".submenu_menu_dropdown").first().toggle(); $(this).parent().find(".submenu_menu_dropdown").first().toggleClass("active_menu"); if($(this).parent().find(".submenu_menu_dropdown").first().hasClass("active_menu")) { $(this).parent().find(".submenu_menu_dropdown").first().attr("style", "display: block !important"); $(this).find(".icon-visible").first().removeClass("fa-caret-down"); $(this).find(".icon-visible").first().addClass("fa-caret-up"); } else{ $(this).parent().find(".submenu_menu_dropdown").first().attr("style", "display: none !important"); $(this).find(".icon-visible").first().removeClass("fa-caret-up"); $(this).find(".icon-visible").first().addClass("fa-caret-down"); } }); } $(".icon-visible").show(); },200); </script> </body> </html>

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