{"id":306,"date":"2010-08-23T14:13:39","date_gmt":"2010-08-23T06:13:39","guid":{"rendered":"\/\/m.letratesoro.com\/2010\/08\/ipc-jedec-j-std-033-msl-bake-condition\/"},"modified":"2024-08-05T18:51:50","modified_gmt":"2024-08-05T10:51:50","slug":"ipc-jedec-j-std-033-msl-bake-condition","status":"publish","type":"post","link":"\/\/m.letratesoro.com\/2010\/08\/ipc-jedec-j-std-033-msl-bake-condition\/","title":{"rendered":"IPC-JEDEC-J-STD-033 \u6fd5\u654f\u96f6\u4ef6\u7684\u70d8\u70e4\u689d\u4ef6"},"content":{"rendered":"
\u4e4b\u524d\u5de5\u4f5c\u718a\u66fe\u7d93\u63d0\u904e\u4e00\u822c\u7684IC\u5c01\u88dd\u96f6\u4ef6\u90fd\u9700\u8981\u6839\u64daMSL\u6a19\u6e96\uff0c\u4f86\u7ba1\u63a7\u96f6\u4ef6\u66b4\u9732\u65bc\u74b0\u5883\u6fd5\u5ea6\u7684\u6642\u9593\uff0c\u4ee5\u78ba\u4fdd\u96f6\u4ef6\u4e0d\u6703\u56e0\u70ba\u904e\u5ea6\u5438\u6fd5\u800c\u5728\u904eSMT<\/a>\u56de\u710a\u7210\u6642\u767c\u751fpopcorn(\u7206\u7c73\u82b1)<\/a>\u6216de-lamination(\u5206\u5c64)\u7684\u5f8c\u679c\u3002\u672c\u6587\u5de5\u4f5c\u718a\u8981\u518d\u9032\u4e00\u6b65\u63a2\u8a0e\uff0c\u5982\u679cMSL\u96f6\u4ef6\u66b4\u9732\u65bc\u5927\u6c23\u6fd5\u5ea6\u8d85\u904e\u898f\u7bc4\u6642\u9593\u8a72\u5982\u4f55\u8655\u7406\uff1f<\/span><\/p>\n \u5176\u5be6\uff0c\u8aaa\u7a7f\u4e86\u96f6\u4ef6\u5438\u6fd5\u5f8c\u8655\u7406\u65b9\u6cd5\u53ea\u6709\u4e00\u7a2e\uff0c\u5c31\u662f\u300c\u70d8\u70e4\u300d\uff0c\u70d8\u70e4\u53ef\u4ee5\u53bb\u9664\u6fd5\u6c23\uff0c\u5c31\u50cf\u6211\u5011\u4f7f\u7528\u6d17\u7897\u7684\u70d8\u70e4\u6a5f\u6216\u662f\u6d17\u8863\u6a5f\u7684\u70d8\u70e4\u6548\u679c\u4e00\u6a23\uff0c\u554f\u984c\u662f\u8a72\u4f7f\u7528\u591a\u5c11\u7684\u6eab\u5ea6\u8207\u591a\u5c11\u6642\u9593\uff0c\u624d\u53ef\u4ee5\u5b89\u5168\u4e14\u4e0d\u50b7\u5bb3\u5230MSL\u96f6\u4ef6\uff0c\u6216\u662f\u53ef\u4ee5\u7528\u6700\u5c0f\u7684\u50b7\u5bb3\uff0c\u53c8\u53ef\u4ee5\u7528\u6700\u77ed\u7684\u6642\u9593\u9054\u5230\u53bb\u9664\u6fd5\u6c23\u7684\u76ee\u7684\uff1f<\/span><\/p>\n <\/p>\n \u5c31\u5982\u540c\u5de5\u4f5c\u718a\u4e4b\u524d\u8aaa\u904e\u7684\uff0c\u4e0d\u540c\u7684\u96f6\u4ef6\u5c01\u88dd\u6703\u7522\u751f\u4e0d\u540c\u7684MSL\u7b49\u7d1a\uff0c\u7576\u6fd5\u6c23\u9032\u5165\u96f6\u4ef6\u8d8a\u591a\uff0c\u96f6\u4ef6\u56e0\u6eab\u5ea6\u800c\u81a8\u8139\u525d\u96e2\u7684\u98a8\u96aa\u5c31\u8d8a\u9ad8\uff0c\u57fa\u672c\u4e0a\u6fd5\u5ea6\u654f\u611f\u7684\u96f6\u4ef6<\/span><\/strong>\u5728\u51fa\u5ee0\u524d\u90fd\u6703\u7d93\u904e\u4e00\u5b9a\u6642\u9593\u53ca\u6eab\u5ea6\u7684\u70d8\u70e4\uff0c\u7136\u5f8c\u9023\u540c\u4e7e\u71e5\u5291<\/strong>(desiccant)<\/span>\u4e00\u8d77\u52a0\u5165\u771f\u7a7a\u5305\u88dd<\/span><\/strong>\u4e2d\u4f86\u9054\u5230\u6700\u4f4e\u7684\u6fd5\u6c23\u5165\u4fb5\u53ef\u80fd\u3002<\/span><\/p>\n \u6709\u8cac\u4efb\u7684\u96f6\u4ef6\u4e5f\u90fd\u6703\u4f9d\u64daJ-STD-020\u6a19\u6e96<\/a>\u4f86\u5ba3\u544a\u5176\u96f6\u4ef6\u7b26\u5408\u4f55\u7a2e\u300c\u6fd5\u654f\u7b49\u7d1a\uff08MSL\uff09\u300d\u3002\u800cEMS\u53caSMT\u5de5\u5ee0\u5247\u5fc5\u9808\u4f9d\u64da\u53e6\u4e00\u4efdIPC-J-STD-033\u6a19\u6e96\u4f86\u64cd\u4f5c\u53ca\u70d8\u70e4\u6fd5\u654f\u96f6\u4ef6\u3002<\/span><\/p>\n <\/p>\n \u8868\u4e00\u4e2d\u6709\u5b9a\u7fa9\u4e86\u4e0d\u540c\u7684MSL\u7b49\u7d1a\u9700\u63a1\u7528\u4e0d\u540c\u7684\u70d8\u70e4\u689d\u4ef6\uff0c\u5c0d\u65bc\u540c\u4e00\u7a2eMSL\u7b49\u7d1a\u7684\u96f6\u4ef6\u4e5f\u63d0\u4f9b\u5e7e\u7a2e\u4e0d\u540c\u7684\u70d8\u70e4\u689d\u4ef6\uff0c\u53ef\u4ee5\u8996\u4f7f\u7528\u8005\u9700\u8981\u63a1\u7528\u3002<\/span><\/p>\n \uff082021\/07\/25\u66f4\u65b0\u8868\u683c\u5167\u5bb9\u5df2\u4fee\u6b63\u540c-033B1\uff0c\u65b0\u589elevel2\uff09<\/span><\/p>\n Table 1. IPC\/JEDEC J-STD-033 Bake Conditions <\/span>for Drying SMD’s at the User Site<\/span><\/p>\n Packageg Body Level Bake @ 125\u00b0C Bake @ 90\u00b0C\/\u22665%RH<\/span> Bake @ 40\u00b0C\/ \u22665%RH Exceeding Floor Life by >72h Exceeding Floor Life by \u2266 72 h Exceeding Floor Life by >72 Exceeding Floor Life by \u2266 72 h Exceeding Floor Life by >72 Exceeding Floor Life by \u2266 72 h Thickness 2<\/span><\/span><\/p>\n<\/td>\n 5 <\/span><\/span>H<\/span><\/p>\n<\/td>\n 3 H<\/span><\/span><\/p>\n<\/td>\n 17 H<\/span><\/span><\/p>\n<\/td>\n 11 H<\/span><\/span><\/p>\n<\/td>\n 8 D<\/span><\/span><\/p>\n<\/td>\n 5 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 2a<\/span><\/span><\/p>\n<\/td>\n 7 <\/span><\/span>H<\/span><\/p>\n<\/td>\n 5 H<\/span><\/span><\/p>\n<\/td>\n 23 H<\/span><\/span><\/p>\n<\/td>\n 13 H<\/span><\/span><\/p>\n<\/td>\n 9 D<\/span><\/span><\/p>\n<\/td>\n 7 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 3<\/span><\/span><\/p>\n<\/td>\n 9 H<\/span><\/span><\/p>\n<\/td>\n 7 H<\/span><\/span><\/p>\n<\/td>\n 33 H<\/span><\/span><\/p>\n<\/td>\n 23 H<\/span><\/span><\/p>\n<\/td>\n 13 D<\/span><\/span><\/p>\n<\/td>\n 9 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 4<\/span><\/span><\/p>\n<\/td>\n 11 H<\/span><\/span><\/p>\n<\/td>\n 7 H <\/span><\/span><\/p>\n<\/td>\n 37 H<\/span><\/span><\/p>\n<\/td>\n 23 H<\/span><\/span><\/p>\n<\/td>\n 15 D<\/span><\/span><\/p>\n<\/td>\n 9 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5<\/span><\/span><\/p>\n<\/td>\n 12 H<\/span><\/span><\/p>\n<\/td>\n 7 H<\/span><\/span><\/p>\n<\/td>\n 41 H<\/span><\/span><\/p>\n<\/td>\n 24 H<\/span><\/span><\/p>\n<\/td>\n 17 D<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5a<\/span><\/span><\/p>\n<\/td>\n 16 H<\/span><\/span><\/p>\n<\/td>\n 10 H<\/span><\/span><\/p>\n<\/td>\n 54 H<\/span><\/span><\/p>\n<\/td>\n 24 H<\/span><\/span><\/p>\n<\/td>\n 22 D<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n Thickness 2<\/span><\/span><\/p>\n<\/td>\n 18 H<\/span><\/span><\/p>\n<\/td>\n 15 H<\/span><\/span><\/p>\n<\/td>\n 63 H<\/span><\/span><\/p>\n<\/td>\n 2 D<\/span><\/span><\/p>\n<\/td>\n 25 D<\/span><\/span><\/p>\n<\/td>\n 20 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 2a<\/span><\/span><\/p>\n<\/td>\n 21 H<\/span><\/span><\/p>\n<\/td>\n 16 H<\/span><\/span><\/p>\n<\/td>\n 3 D<\/span><\/span><\/p>\n<\/td>\n 2 D<\/span><\/span><\/p>\n<\/td>\n 29 D<\/span><\/span><\/p>\n<\/td>\n 22 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 3<\/span><\/span><\/p>\n<\/td>\n 27 H<\/span><\/span><\/p>\n<\/td>\n 17 H<\/span><\/span><\/p>\n<\/td>\n 4 D <\/span><\/span><\/p>\n<\/td>\n 2 D<\/span><\/span><\/p>\n<\/td>\n 37 D<\/span><\/span><\/p>\n<\/td>\n 23 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 4<\/span><\/span><\/p>\n<\/td>\n 34 H<\/span><\/span><\/p>\n<\/td>\n 20 H<\/span><\/span><\/p>\n<\/td>\n 5 D<\/span><\/span><\/p>\n<\/td>\n 3 D<\/span><\/span><\/p>\n<\/td>\n 47 D<\/span><\/span><\/p>\n<\/td>\n 28 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5<\/span><\/span><\/p>\n<\/td>\n 40 H<\/span><\/span><\/p>\n<\/td>\n 25 H<\/span><\/span><\/p>\n<\/td>\n 6 D<\/span><\/span><\/p>\n<\/td>\n 4 D<\/span><\/span><\/p>\n<\/td>\n 57 D<\/span><\/span><\/p>\n<\/td>\n 35 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5a<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 40 H<\/span><\/span><\/p>\n<\/td>\n 8 D<\/span><\/span><\/p>\n<\/td>\n 6 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 56 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n Thickness 2<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 7 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 2a<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 7 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 3<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 8 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 4<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n 5a<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 48 H<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 10 D<\/span><\/span><\/p>\n<\/td>\n 79 D<\/span><\/span><\/p>\n<\/td>\n 67 D<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n BGA package >17mm x17mm or any stacked die package (See Note2)<\/span><\/p>\n<\/td>\n \n<\/td>\n 96 H<\/span><\/span><\/p>\n<\/td>\n As above per package thickness and moisture level<\/span><\/span><\/p>\n<\/td>\n N\/A<\/span><\/span><\/p>\n<\/td>\n As above per package thickness and moisture level<\/span><\/span><\/p>\n<\/td>\n N\/A<\/span><\/span><\/p>\n<\/td>\n As above per package thickness and moisture level<\/span><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <\/p>\n \n \u8868\u4e8c\u4e2d\u6709\u5b9a\u7fa9\u6fd5\u654f\u96f6\u4ef6\u5728\u5176\u88fd\u9020\u5de5\u5ee0\u51fa\u5ee0\u6642\uff0c\u9700\u91dd\u5c0d\u4e0d\u540cMSL\u7b49\u7d1a\u7684\u96f6\u4ef6\uff0c\u63a1\u7528\u4e0d\u540c\u7684\u70d8\u70e4\u689d\u4ef6\uff0c\u9019\u88e1\u5c0d\u65bc\u540c\u4e00\u7a2eMSL\u7b49\u7d1a\u7684\u96f6\u4ef6\u63d0\u4f9b\u4e86\u5169\u7a2e\u70d8\u70e4\u689d\u4ef6\uff0c\u53ef\u4ee5\u8996\u4f7f\u7528\u8005\u9700\u8981\u63a1\u7528\u3002<\/span><\/p>\n \uff082021\/07\/25\u66f4\u65b0\u8868\u683c\u5167\u5bb9\u5df2\u4fee\u6b63\u540c-033B1\uff0c\u65b0\u589elevel2\uff09<\/span><\/p>\n <\/p>\n Table 2. IPC\/JEDEC J-STD-033 Bake Conditions Prior <\/span><\/b>to Dry Packing SMD’s at the Manufacturer’s Site<\/span><\/b><\/span><\/p>\n\u4e0b\u9762\u7684\u3010\u8868\u4e00\u3011\uff0c\u70ba IPC\/JEDEC J-STD-033 \u91dd\u5c0d\u4f7f\u7528\u8005\u7aef\u4f7f\u7528\u3010\u6fd5\u654f\u96f6\u4ef6\u3011\u6642\u7684\u70d8\u70e4\u689d\u4ef6\u3002<\/span><\/h4>\n
\n\n
\n \n
\n\u5c01\u88dd\u96f6\u4ef6\u7684\u539a\u5ea6<\/strong><\/span><\/p>\n<\/td>\n\n
\n\u6fd5\u654f\u7b49\u7d1a<\/strong><\/span><\/p>\n<\/td>\n\n
\n\u70d8\u70e4125\u00b0C<\/span><\/strong><\/p>\n<\/td>\n\n
\n\u70d8\u70e490\u00b0C\/\u22665%RH<\/span><\/span><\/strong><\/p>\n<\/td>\n\n
\n<\/strong><\/span>\u70d8\u70e440\u00b0C\/ \u22665%RH<\/strong><\/span> <\/span><\/p>\n<\/td>\n<\/tr>\n\n \n
\n\u8eca\u9593\u58fd\u547d >72h<\/span><\/span><\/span><\/p>\n<\/td>\n\n
\n\u8eca\u9593\u58fd\u547d \u2266 72 h<\/span><\/p>\n<\/td>\n\n
\n\u8eca\u9593\u58fd\u547d >72h<\/span><\/span><\/p>\n<\/td>\n\n
\n\u8eca\u9593\u58fd\u547d \u2266 72 h<\/span><\/p>\n<\/td>\n\n
\n\u8eca\u9593\u58fd\u547d >72h<\/span><\/span><\/p>\n<\/td>\n\n
\n\u8eca\u9593\u58fd\u547d \u2266 72 h<\/span><\/p>\n<\/td>\n<\/tr>\n\n \n
\n\u22661.4 mm<\/span><\/p>\n<\/td>\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\n> 1.4mm
\n<\/span>\u2266<\/span> 2.0mm<\/span><\/p>\n<\/td>\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\n> 2.0mm
\n<\/span>\u2266 <\/span>4.5mm<\/span><\/p>\n<\/td>\n\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n
\n\u5c0d\u5c01\u88dd\u5927\u65bc17mmx17mm\u7684BGA\uff0c\u57fa\u6750\u5167\u6c92\u6709\u963b\u64cb\u6fd5\u6c23\u64f4\u6563\u7684\u5167\u5c64\uff0c\u53ef\u4ee5\u4f9d\u64da\u8868\u683c\u4e2d\u7684\u539a\u5ea6\/\u6fd5\u654f\u7b49\u7d1a\u90e8\u5206\u4f86\u9078\u64c7\u70d8\u70e4\u6642\u9593\u3002<\/span><\/span><\/div>\n<\/li>\n
\n<\/strong>\u8868\u793aSMD\u5c01\u88dd\u66b4\u9732\u65bc\u8eca\u9593\u74b0\u5883\u8d85\u904e1\u500b\u5c0f\u6642\u4e0a\uff0c\u518d\u653e\u56de\u4e7e\u71e5\u7bb1\u6216\u662f\u4e7e\u71e5\u5305\u88dd\u5167\uff0c\u5982\u679c\u7b26\u5408\u300c\u77ed\u6642\u9593\u66b4\u9732\u300d\u689d\u4ef6\uff0c\u5247\u5176\u66b4\u9732\u8eca\u9593\u58fd\u547d\u53ef\u4ee5\u66ab\u505c\u8a08\u7b97\uff0c\u5426\u5247\u9700\u4f9d\u4e0a\u8868\u8981\u6c42\u70d8\u70e4\u3002<\/span><\/div>\n<\/li>\n
\n\u5982\u679cSMD\u5c01\u88dd\u50c5\u66dd\u9732\u5728\u4e0d\u8d85\u904e30\u2103\/60%RH\u4ee5\u4e0b\u74b0\u5883\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e7e\u71e5\u5305\u88dd\u6216\u4e7e\u71e5\u7bb1\u7d93\u7531\u5ba4\u6eab\u4f86\u4e7e\u71e5\u5373\u53ef\u3002\u5982\u679c\u6709\u4f7f\u7528\u4e7e\u71e5\u5305\u88dd\uff0c\u800c\u4e14\u7e3d\u66b4\u9732\u6642\u9593\u4e0d\u8d85\u904e30\u5206\u9418\uff0c\u5247\u539f\u4f86\u7684\u4e7e\u71e5\u5291\u53ef\u4ee5\u91cd\u65b0\u4f7f\u7528\u3002<\/span><\/span><\/div>\n<\/li>\n
\n\u8868\u793a\u7576\u6fd5\u654f\u96f6\u4ef6\u5f9e\u771f\u7a7a\u5305\u88dd(MBB\uff0cMoisture Barrier Bag)\u4e2d\u62ff\u51fa\uff0c\u958b\u59cb\u66b4\u9732\u65bc\u6eab\u5ea6\u4f4e\u65bc<\/span><\/strong>30\u00b0C\u4e14\u76f8\u5c0d\u6fd5\u5ea6\u5c0f\u65bc<\/span><\/strong>60%RH\u7684\u74b0\u5883\u4e0b\uff0c\u4e14\u66b4\u9732\u8eca\u9593\u6642\u9593\u572872\u5c0f\u6642\u5167\uff0c\u53ef\u4ee5\u4f9d\u64da\u4e0a\u8868\u7684\u6eab\u5ea6\u53ca\u6642\u9593\u8981\u6c42\uff0c\u7d93\u904e\u70d8\u70e4\u5f8c\u653e\u5165\u65b0\u7684\u4e7e\u71e5\u5291\u65bcMBB\u4e2d\uff0c\u5247\u5176\u4fdd\u5b58\u671f\u9650\u5c31\u53ef\u4ee5\u91cd\u65b0\u8a08\u7b97\u3002(\u5de5\u4f5c\u718a\u5099\u8a3b\uff1a\u8acb\u6ce8\u610f\u53ea\u6709MSL\u7684\u4fdd\u5b58\u671f\u9650\u91cd\u8a08\uff0c\u7522\u54c1\u7684\u88fd\u9020\u65e5\u671f\u53ca\u771f\u6b63\u58fd\u547d\u4e0d\u80fd\u91cd\u7b97<\/span>)<\/span><\/div>\n<\/li>\n<\/ul>\n\u4e0b\u9762\u7684\u8868\u3010\u4e8c\u3011\uff0c \u70ba IPC\/JEDEC J-STD-033 \u91dd\u5c0d\u96f6\u4ef6\u751f\u7522\u5ee0\u5546\u51fa\u5ee0\u96f6\u4ef6\u7684\u70d8\u70e4\u689d\u4ef6\u898f\u5b9a\u3002<\/span><\/h4>\n