Clarification on 4-Layer PCB Stackup and Inner Layer Residual Copper Ratio

Engineer asked May 28,2025
0

Hi,

I’m looking to obtain the detailed layer stackup for a 4-layer PCB. I reviewed the information on your website (https://www.pcbway.com/multi-layer-laminated-structure.html), which shows three different stackup options depending on the inner layer residual copper ratio.

However, I couldn’t find an option to specify the residual copper ratio during the PCB quoting process.

Could you please confirm which stackup will be used by default, or how I can select the appropriate one? I need this information to set up an HFSS simulation for CPW design.

Thank you,

  • Your Answer(1)
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    '; html += '' + msgList[item].EnAddTime + ''; html += '' + (msgList[item].ReplyList ? msgList[item].ReplyList.length : 0) + ' ' + $('#JsA1').val() + ''; html += '
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    '; if (ReplyList[reply].ReplyCommentId > 0 && ReplyList[reply].ReplyCommentId != msgList[item].Id) { html += '
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    • '; } $('#commentload').hide(); $('#comment_ul').append(html); } } $('#commentload').hide(); }, error: function (xhr, status, error) { $('#commentload').hide(); } }); }, //保存数据 fn_save_msg: function (level, id) { var msg = $('#msg-' + id).val(); var msgpic = commentObj.getPicImgArr(id); if (msg && msg.length > 10000) { $('#msg-' + id).addClass('form-error'); return false; } else if (msg && msg.length > 0) { //msg = commentObj.convertToHTMLFn(msg); } if ((msg && msg.length > 0) || msgpic.length > 4) { $('body').addClass('global-loading'); $.ajax({ url: commentObj.fn_save_comment_url(), //dataType: 'jsonp', type: 'POST', data: { msg: msg, replyid: id, objid: commentObj.obj_id, msgpic: msgpic, objtype: commentObj.obj_type, isproject: commentObj.is_project }, crossDomain: true, xhrFields: { withCredentials: true }, success: function (res) { if (res.result) { //if (ispage > 0) { // window.location.reload(); // return; //} //js加载，不刷新页面，增强体验 $('#msg-' + id).val(""); if (level == 1) { $('.js-add-comment .js-words').css({ 'color': '#999' }).text(0); } else { $('#msg-' + id).next().find('.js-words').css({ 'color': '#999' }).text(0); } if (level == 1) { $('#js-views-example' + id).html(""); //第一级留言（直接回复文章） var objtype = parseInt($('#hidobjtype').val()); var html = '
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    '; if (level == 3) { //第三级留言（回复第二级留言） commentObj.fn_add_reply(3, id); $('#div-three-' + id).parent('div').append(html); } else { commentObj.fn_add_reply(2, id); $('#div-two-' + id).show().children('div').append(html); } commentObj.fn_up_msg_cnt(1); commentObj.fn_up_level_msg_cnt(level, res.msg.Id, 1); } commentObj.fn_uploader(id); $('#error-tips').hide(); $('#msg-' + id).removeClass('form-error'); $('#error-tips-img' + id).hide(); $('#error-tips-img-size' + id).hide(); $('#error-tips-img-type' + id).hide(); } else if (res.msg == "nologin") { //弹出登录框 layerLogin(); } else { layer.alert("error"); } $('body').removeClass('global-loading'); }, error: function (xhr, status, error) { if (xhr.status == 403) { layer.alert("Amazon Firewall Warning: 403 Forbidden - Content may contain sensitive or dangerous words."); } $('body').removeClass('global-loading'); } }); } else { $('#msg-' + id).addClass('form-error'); if (!$('#msg-' + id).hasClass('js-mention')) $('#error-tips').show().Shake(4, 10); return false; } }, //上传文件 fn_uploader: function (id) { /*上传文件开始*/ var uploader = WebUploader.create({ // 选完文件后，是否自动上传。 auto: true, // swf文件路径 swf: '/img/js/jqueryplus/webuploader-0.1.5/Uploader.swf', // 文件接收服务端。 server: '/Common/UpFile', // 选择文件的按钮。可选。 // 内部根据当前运行是创建，可能是input元素，也可能是flash. pick: { id: '#msgFile' + id, multiple: false }, fileVal: 'FileData', fileNumLimit: 5, fileSingleSizeLimit: '2097152',//'10485760',5242880,2097152 accept: { title: 'File', extensions: 'bmp,png,gif,jpg,jpeg', mimeTypes: 'image/*' }, 'formData': { 'uptype': "blogfile", 'key': "", 'checkcode': "", "getjson": true }, }); uploader.on('beforeFileQueued', function (file) { $('#error-tips').hide(); $('#msg-' + id).removeClass('form-error'); $('#error-tips-img' + id).hide(); $('#error-tips-img-type' + id).hide() $('#error-tips-img-size' + id).hide() }); uploader.on('uploadStart', function (file, percentage) { if (logintype != 1) { layerLogin(); return; } $("#progress-box" + id).show(); }); uploader.on('uploadProgress', function (file, percentage) { $('.progress').attr('data-percent', parseInt(percentage * 80)) }); uploader.on('uploadSuccess', function (file, data) { if (data.state === "SUCCESS") { var tempImg = '
    '; tempImg += ''; tempImg += '
    '; tempImg += '
    '; $('#js-views-example' + id).show().append(tempImg) } $('.progress').attr('data-percent', parseInt(0)) $("#progress-box" + id).hide(); // 上传图预览 $(document).on('click', '.js-views-example .del-pic', function () { var fileid = $(this)[0].id; var file = uploader.getFile(fileid) if (file) { uploader.removeFile(file, true); // 删除文件 } $(this).parent().remove(); $('#error-tips').hide(); $('#msg-' + id).removeClass('form-error'); $('#error-tips-img' + id).hide(); $('#error-tips-img-size' + id).hide(); $('#error-tips-img-type' + id).hide(); }) }); uploader.on('error', function (str) { if (str == "Q_EXCEED_NUM_LIMIT") { $('#error-tips-img' + id).show().Shake(4, 10); } else if (str == "Q_TYPE_DENIED") { $('#error-tips-img-type' + id).show().Shake(4, 10); } else if (str == "F_EXCEED_SIZE") { $('#error-tips-img-size' + id).show().Shake(4, 10); } setTimeout(function () { $('#error-tips-img' + id).hide(); $('#error-tips-img-size' + id).hide(); $('#error-tips-img-type' + id).hide(); }, 3000); }); /*上传文件结束*/ }, // 文本域转html convertToHTMLFn: function (text) { return text.replace(/\n/g, '
    ').replace(/ /g, ' '); }, getPicImgArr: function (id) { var imgpicarr = []; $("img[name='pig-img" + id + "']").each(function (i, e) { imgpicarr.push(e.src); }) return imgpicarr.length > 0 ? imgpicarr.join(',') : ""; } } commentObj.fn_init(); -->
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