![\"Step-up](\"\/\/m.letratesoro.com\/wp-content\/uploads\/2010\/07\/stepupstencil02s.jpg\" "\\"Step-up")
<\/p>\n<\/p>\n
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SMT\u7684\u968e\u68af\u5f0f\u92fc\u677f\u662f\u5728\u540c\u4e00\u7247\u92fc\u677f(stencil)\u4e2d\u70ba\u4e86\u53ef\u4ee5\u5c40\u90e8\u589e\u52a0\u6216\u6e1b\u5c11\u932b\u818f\u91cf\u800c\u5728\u92fc\u677f\u7684\u5c45\u90e8\u4f4d\u7f6e\u589e\u52a0\u6216\u6253\u8584\u92fc\u677f\u539a\u5ea6\u7684\u4e00\u7a2e\u92fc\u677f\uff0c\u6709\u5225\u65bc\u4e00\u822c\u92fc\u677f\u4e0a\u7684\u6240\u6709\u4f4d\u7f6e\u90fd\u662f\u540c\u4e00\u539a\u5ea6\u3002\u968e\u68af\u5f0f\u92fc\u677f\u57fa\u672c\u4e0a\u4f7f\u7528\u9700\u6c42\u6700\u539a\u7684\u92fc\u7247\uff0c\u7136\u5f8c\u7528\u9433\u5c04\u6383\u6389\u591a\u9918\u7684\u90e8\u5206\uff0c\u6bd4\u5982\u8aaa\u4e00\u72470.12mm\u539a\u5ea6\u7684\u92fc\u677f\uff0c\u4e0a\u9762\u6709\u5c40\u90e8\u52a0\u539a\u52300.15mm\u7684\u968e\u68af\u92fc\u677f\uff0c\u5c31\u75280.15mm\u539a\u5ea6\u7684\u92fc\u7247\u4f86\u52a0\u5de5\u8655\u7406\u3002<\/font><\/p>\n 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\u7576\u7136\uff0c\u9019\u7a2e\u7279\u6b8a\u92fc\u677f\u7684\u50f9\u9322\u6703\u8f03\u4e00\u822c\u7684\u92fc\u677f\u8cb4\u4e0a10\uff05\u5de6\u53f3\uff0c\u56e0\u70ba\u9019\u7a2e\u7279\u6b8a\u92fc\u677f\u5fc5\u9808\u4f7f\u7528\u8f03\u539a\u7684\u92fc\u677f\uff0c\u7136\u5f8c\u5229\u7528\u96f7\u5c04\u7684\u65b9\u5f0f\u53bb\u9664\u6389\u9700\u8981\u8b8a\u8584\u7684\u90e8\u4efd\uff0c\u6240\u4ee5 STEP-DOWN \u61c9\u8a72\u6703\u6bd4 STEP-UP \u4f86\u5f97\u5bb9\u6613\u88fd\u4f5c\u3002\u6240\u4ee5\uff0c\u5982\u679c\u53ea\u662f\u55ae\u7d14\u7684\u60f3\u8981\u589e\u52a0\u932b\u818f\u91cf\uff0c\u53ef\u4ee5\u5148\u8a66\u770b\u770b\u589e\u52a0\u92fc\u677f\u7684\u958b\u53e3(APERTURE)\u4ee5\u964d\u4f4e\u6210\u672c\u3002<\/font><\/p>\n \u53e6\u5916\u5fc5\u9808\u63d0\u9192\u7684\uff0c\u9019\u7a2e\u7279\u6b8a\u92fc\u677f\u6703\u6709\u4ee5\u4e0b\u7684\u9650\u5236\uff1a<\/font><\/p>\n \u5f8c\u8a18\uff1a<\/strong><\/font><\/p>\n 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<\/font>![\"smallchipsize01\"](\"\/\/m.letratesoro.com\/wp-content\/uploads\/2010\/07\/smallchipsize01.jpg\" "\\"smallchipsize01\\"")
<\/font><\/a> <\/font><\/font><\/a><\/p>\n\u4ec0\u9ebc\u662fSMT\u968e\u68af\u92fc\u677f\uff1f<\/font><\/h2>\n
\u4ec0\u9ebc\u662f\u4e0a\u92fc\u677f(Step-up stencil)\u53ca\u4e0b\u92fc\u677f(Step-down stencil)\u968e\u68af\u92fc\u677f\uff1f<\/font><\/h2>\n
\u968e\u68af\u92fc\u677f\u57fa\u672c\u4e0a\u5206\u6210\u5169\u7a2e\u985e\u578b\uff0c\u5206\u5225\u70ba\u4e0a\u92fc\u677f(Step-up stencil)<\/span><\/strong>\u53c8\u7a31\u70ba\u300c\u5c40\u90e8\u52a0\u539a\u300d\u92fc\u677f<\/span><\/strong>\u53ca \u4e0b\u92fc\u677f(Step-down stencil)<\/span><\/strong>\u53c8\u7a31\u70ba\u300c\u5c40\u90e8\u6253\u8584\u300d\u92fc\u677f<\/span><\/strong>\u3002\u9019\u5169\u7a2e\u7279\u6b8a\u92fc\u677f\u53ef\u4ee5\u85c9\u7531\u5728\u92fc\u677f\u4e0a\u5c40\u90e8\u589e\u52a0\u539a\u5ea6(step-up)\u4f86\u5c40\u90e8\u589e\u52a0PCB\u4e0a\u90e8\u5206\u4f4d\u7f6e\u7684\u932b\u818f\u5370\u5237\u91cf\uff0c\u6bd4\u5982\u8aaaUSB\u3001\u8033\u6a5f\u5ea7\u7b49IO\u9023\u63a5\u5668\uff0c\u6216\u662f\u6a21\u7d44\u3001\u5fae\u52d5\u958b\u95dc\u3001\u8b8a\u58d3\u5668\u7b49\u5927\u578b\u96f6\u4ef6\u9700\u8981\u7279\u5225\u589e\u52a0\u932b\u818f\u91cf\uff0c\u4e5f\u53ef\u4ee5\u6709\u6548\u514b\u670d\u4e00\u4e9b\u96f6\u4ef6\u8173\u4f4d\u4e0d\u5920\u5e73\u6574(coplanarity)\u7684\u554f\u984c\uff1b\u6216\u662f\u5c40\u90e8\u7684\u964d\u4f4e\u92fc\u677f\u539a\u5ea6(step-down)\u800c\u6e1b\u5c11\u932b\u818f\u91cf\uff0c\u6bd4\u5982\u91dd\u5c0d\u4e00\u4e9b\u7d30\u9593\u8173(fine-pitch)\u96f6\u4ef6\uff0c\u4e0d\u80fd\u5370\u5237\u592a\u591a\u932b\u818f\uff0c\u5426\u5247\u5bb9\u6613\u77ed\u8def\u3002<\/font><\/p>\n\u968e\u68af\u5f0f\u92fc\u677f\u7684\u4f7f\u7528\u9650\u5236<\/font><\/font><\/h2>\n
<\/font><\/p>\n\n
\u540c\u4e00\u7247\u92fc\u677f\u7684\u9ad8\u5ea6\u5dee\u5efa\u8b70\u57280.03mm\u4ee5\u5167\uff0c\u4e5f\u5c31\u662f\u8aaa\u5982\u679c\u92fc\u677f\u70ba0.15mm\u7684\u539a\u5ea6\uff0c\u90a3\u9ebc STEP-UP\u7684\u92fc\u677f\u539a\u5ea6\u5c31\u4e0d\u61c9\u8a72\u8d85\u904e 0.18mm\uff0c\u7576\u7136\u4f60\u4e5f\u53ef\u4ee5\u4f9d\u9700\u8981\u589e\u52a0\u66f4\u9ad8\u7684\u539a\u5ea6\uff0c\u4f46\u540c\u4e00\u7247\u92fc\u677f\u7684\u539a\u5ea6\u8b8a\u5316\u8d8a\u5927\uff0c\u539a\u8584\u4e4b\u9593\u7684\u932b\u818f\u63a7\u5236\u91cf\u5c31\u8d8a\u5bb9\u6613\u51fa\u554f\u984c\uff0c\u6240\u4ee5\u539a\u5ea6\u7684\u589e\u52a0\u5fc5\u9808\u91cf\u529b\u800c\u70ba\uff0c\u4e4b\u6240\u4ee5\u9019\u6a23\u5efa\u8b70\u662f\u56e0\u70ba\u73fe\u5728\u7684PCB\u8a2d\u8a08\u7d93\u5e38\u662f\u5927\u5c0f\u96f6\u4ef6\u6df7\u642d\uff0c\u7576\u4f60\u70ba\u5927\u96f6\u4ef6\u589e\u52a0\u932b\u818f\u91cf\u6642\uff0c\u65c1\u908a\u7684\u5c0f\u96f6\u4ef6\u4e5f\u6703\u56e0\u6b21\u589e\u52a0\u932b\u91cf\u800c\u9020\u6210\u5176\u4ed6\u554f\u984c\uff0c\u4e5f\u5c31\u662f\u7576\u4f60\u60f3\u589e\u52a0\u66f4\u9ad8\u7684\u5c40\u90e8\u92fc\u677f\u539a\u5ea6\u8981\u8003\u616e\u65c1\u908a\u662f\u5426\u6709\u5c0f\u96f6\u4ef6\u3002
\u800c STEP-DOWN \u92fc\u677f\u7684\u539a\u5ea6\u4e00\u822c\u5efa\u8b70\u4e0d\u61c9\u5c0f\u65bc 0.12mm\u3002\u56e0\u70ba\u522e\u5200\u5728\u5370\u5237\u6642\uff0c\u4e0d\u592a\u5bb9\u6613\u96a8\u6642\u63a7\u5236\u8b8a\u63db\u5176\u9ad8\u5ea6\uff0c\u4ee5\u914d\u5408\u92fc\u677f\u7684\u9ad8\u5ea6\u5dee\uff0c\u5982\u679c\u9ad8\u5ea6\u5dee\u8b8a\u5316\u592a\u5927\uff0c\u5bb9\u6613\u51fa\u73fe\u522e\u5200\u58d3\u529b\u904e\u5927\u6216\u662f\u904e\u5c0f\u7684\u554f\u984c\uff0c\u800c\u7522\u751f\u932b\u818f\u91cf\u904e\u591a\u6216\u662f\u904e\u5c11\uff0c\u751a\u81f3\u8b8a\u5f62\u7684\u7f3a\u5931\u3002 <\/font><\/div>\n<\/li>\n<\/ul>\n\n
\u5728\u522e\u5200\u522e\u904e STEP-UP \u6216\u662f STEP-DOWN \u7684\u92fc\u677f\u5340\u57df\uff0c\u92fc\u677f\u7684\u539a\u5ea6\u6700\u597d\u53ef\u4ee5\u540c\u6642\u52a0\u539a\u6216\u662f\u8b8a\u8584\uff0c\u56e0\u70ba\u522e\u5200\u78b0\u5230 STEP-UP \u7684\u5340\u57df\u6703\u7a81\u7136\u88ab\u6490\u8d77\u4f86\uff0c\u5982\u679c\u540c\u4e00\u76f4\u7dda\u4e0a\u7684\u90e8\u4efd\u92fc\u677f\u539a\u5ea6\u672a\u8ddf\u8457\u52a0\u9ad8\uff0c\u5c31\u5bb9\u6613\u51fa\u73fe\u932b\u818f\u91cf\u4e0d\u5747\u52fb\u7684\u73fe\u8c61\u3002\u9019\u95dc\u4fc2\u5230\u96fb\u8def\u677f\u96f6\u4ef6\u64fa\u653e(LAYOUT)\u7684\u8a2d\u8a08\uff0c\u5fc5\u9808\u8981\u6c42\u96fb\u8def\u677f\u7684CAD\u5de5\u7a0b\u5e2b\u914d\u5408\uff0c\u628a\u9700\u8981\u8f03\u591a\u932b\u91cf\u6216\u662f\u8f03\u5c11\u932b\u91cf\u7684\u96f6\u4ef6\u64fa\u653e\u5728\u540c\u4e00\u76f4\u7dda\u5340\u57df\uff0c\u5982\u6b64\u522e\u5200\u522e\u904e\u53bb\u7684\u6642\u5019\uff0c\u624d\u53ef\u4ee5\u540c\u6642\u589e\u52a0\u6216\u6642\u6e1b\u5c11\u932b\u818f\u91cf\u3002\u7576\u7136\u73fe\u5be6\u4e0a\u5927\u90e8\u5206\u7684 STEP-UP \u92fc\u677f\u90fd\u4e0d\u6703\u6574\u500b\u52a0\u539a\uff0c\u901a\u5e38\u90fd\u53ea\u6709\u9700\u8981\u7684\u5c40\u90e8\u5340\u57df\u52a0\u539a\u800c\u5df2\uff0c\u6240\u4ee5\u4f7f\u7528\u5c1a\u8981\u66f4\u5c0f\u5fc3\u3002 <\/font><\/div>\n<\/li>\n<\/ul>\n\n
\u5728\u92fc\u677f\u7684 STEP-UP \u6216\u662f STEP-DOWN \u908a\u7de3\uff0c\u9700\u81f3\u5c11\u61c9\u8a72\u4fdd\u7559 3\uff5e5mm \u7684\u7a7a\u9593\uff0c\u5176\u5f8c\u624d\u53ef\u4ee5\u518d\u64fa\u653e\u5176\u4ed6\u7684\u5c0f\u96f6\u4ef6(\u932b\u818f\u91cf\u5c11)\u6216\u662f\u5927\u96f6\u4ef6(\u932b\u818f\u91cf\u591a)\uff0c\u9019\u662f\u70ba\u4e86\u907f\u514d\u522e\u5200\u4f86\u4e0d\u53ca\u53cd\u61c9\u92fc\u677f\u539a\u5ea6\u7684\u8b8a\u5316\uff0c\u7522\u751f\u7121\u6cd5\u5c07\u932b\u818f\u5b8c\u5168\u7684\u522e\u5165\u5176\u958b\u53e3(APERTURE)\uff0c\u4e26\u9020\u6210\u932b\u818f\u91cf\u4e0d\u8db3\u7684\u73fe\u8c61\u767c\u751f\u3002 <\/font><\/div>\n<\/li>\n<\/ul>\n\n
\u4f7f\u7528\u9019\u7a2e STEP-UP \u6216\u662f STEP-DOWN \u92fc\u677f\u6642\uff0c\u522e\u5200\u7684\u901f\u5ea6\u5fc5\u9808\u8981\u9069\u7576\u964d\u4f4e\u624d\u80fd\u5f97\u5230\u8f03\u7cbe\u6e96\u7684\u932b\u818f\u91cf\uff0c\u9084\u8981\u63a7\u5236\u522e\u5200\u7684\u4e0b\u58d3\u529b\u3002<\/font> <\/font><\/div>\n<\/li>\n<\/ul>\n
\n
\u5408\u6210\u77f3\u904e\u7210\u6258\u76e4(Reflow carrier)<\/font><\/a>
\u8ff4\u6d41\u710a\u7684\u6eab\u5ea6\u66f2\u7dda Reflow Profile<\/font><\/a>
\u5c4f\u853d\u6846(Shielding frame)\u8a2d\u8a08\u8207\u751f\u7522\u6ce8\u610f\u4e8b\u9805<\/font><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"