{"id":15604,"date":"2017-05-23T15:55:41","date_gmt":"2017-05-23T07:55:41","guid":{"rendered":"http:\/\/www.seeedstudio.com\/blog\/?p=15604"},"modified":"2020-03-26T14:40:15","modified_gmt":"2020-03-26T06:40:15","slug":"solder-mask-design","status":"publish","type":"post","link":"https:\/\/www.seeedstudio.com\/blog\/2017\/05\/23\/solder-mask-design\/","title":{"rendered":"Solder Mask Design – PCB DFM Part 6"},"content":{"rendered":"

6.1 Solder Mask Design for Copper Traces<\/h2>\n[50] Generally, solder mask will cover copper traces, but in special cases, traces can be exposed according to\nthe specific requirements.\n

6.2 Solder Mask Design for Holes<\/h2>\n6.2.1 Via Holes<\/strong>\n[51] Via holes should have solder mask openings on both sides of the board centered about the hole, as shown\nin Figure 33. The required diameter of the opening should be D + 5mil where D is the diameter of the plated\nhole.\n\n\"plated\nFigure 33: Solder Mask opening for via holes.\n\n6.2.2 Alignment Holes<\/strong>\n[52] For metallic rivet holes, the solder mask opening should be centered about the rivet hole with a diameter +\n6mil of the plated pad, on both sides.\n\n\"Solder\nFigure 34: Metallic rivet hole solder mask opening.\n[53] For non-plated rivet holes, the solder mask opening should be greater than the clearance area for the screw\nhead.\n\n\"Clearance\nFigure 35: Non-metallic rivet hole solder mask opening.\n[54] The solder mask openings for Type A wave soldered holes should satisfy:\n\n\"Solder\n\nFigure 36: Type A mechanical hole solder mask opening.\n\n6.2.3 Positioning Holes<\/strong>\n[55] The solder mask opening on the front and back sides of non-plated holes should be D +10mil, concentric\nabout the hole, where D is the diameter of the non-plated hole.\n\n\"Solder\nFigure 37: Solder mask opening for non-plated mechanical holes.\n\n6.2.4 Buried and Plugged Vias<\/strong>\n[56] Internal vias (buried vias) do not require solder mask openings on either side of the board.\n[57] For PCBs requiring wave soldering or if the board has BGA (or CSP) with a pitch smaller than 1.00mm,\nthe BGA via hole should be plugged.\n[58] If an in circuit testing (ICT) point is added under the BGA, it is recommended to lead out the testing pad\nfrom the via hole as shown in figure 38. The diameter of the test pads should be 32mil; solder mask opening is\n40mil.\n\n\"BGA\n\nFigure 38: BGA Testing pad.\n[59] If the PCB does not require wave soldering, and the pitch of BGA components is greater that 1.00mm,\nthen there is no need for plugged vias. The BGA via itself can be used as a test point. The top side solder\nmask opening should be 5mil bigger than the diameter of the hole. The bottom side testing pad should be\n32mil with a solder mask opening of 40mil.\n

6.3 Solder Pad Solder Mask Design<\/h2>\n[60] Solder mask design for copper pads should follow figure 39.\n\n\"Solder\n\nFigure 39: Solder mask openings for copper pads\n[61] Since PCB manufacturers have limited precision and limits on the minimum width of solder mask\nopenings, solder mask openings should be at least 6mil bigger than pad size (3mil each side), with a minimum\nsolder mask bridge width of 3mil. There must be solder mask separating pads and holes to prevent solder\nbridges from forming and causing short circuits.\n\n\"solder\n\nFigure 40: Solder mask openings and material widths for various copper pads.\nTable 7: Recommended minimum solder mask material width between pads.\n\n\"solder\n\n[62] Groups of SMD pads less than 0.5mm (20mil) apart or less than 10mil between the pad edges do not need\nsolder mask to separate them and can be opened as a group. See figure 41.\n\n\"group\n\nFigure 41: Solder mask openings for fine pitch SMD components\n\n[63] Solder mask openings are recommended for heatsink contacts.\n

6.4 Gold-Finger Solder Mask Design<\/h2>\n[64] The copper pads of gold-finger connectors should open up the solder mask together. The top of the pads\n(where the trace is connected) should be opened flush with the solder mask material, and the bottom end\nsolder mask opening should close beyond the edge of the board, as shown in figure 42.\n\n\"Solder\n\nFigure 42: Solder mask opening for a gold-finger\n\nSeeed Studio Fusion\u00a0prototype PCB manufacturing<\/a> service offers 6 kinds of colors incluing green, blue, red, white, black, yellow for free, and Fusion Advanced PCB<\/a> service even support purple and matt green color!\n\nMore Chapters:<\/strong>\n1.\u00a0Brief Introduction<\/a>\n2.\u00a0Seeed Fusion PCB Specification<\/a>\n3.\u00a0Panelization and Bridge Design<\/a>\n4.\u00a0Component Layout Considerations<\/a>\n5.\u00a0PCB Hole design<\/a>\n6.\u00a0Solder Mask Design<\/a>\n7.\u00a0Copper Trace Design<\/a>\n8.\u00a0Silkscreen Design<\/a>\n9.\u00a0PCB Lamination Structure<\/a>\n10.\u00a0PCB Dimensions Specification<\/a>\n11.\u00a0Fiducial Mark Design<\/a>\n12.\u00a0Surface Treatment<\/a>\n13.\u00a0Files for Manufacture Requirements<\/a>\n14.\u00a0Appendix<\/a>\n

<\/p>\n\n\n

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<\/div>","protected":false},"excerpt":{"rendered":"

6.1 Solder Mask Design for Copper Traces [50] Generally, solder mask will cover copper traces,<\/p>\n","protected":false},"author":40,"featured_media":15614,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"iawp_total_views":0,"footnotes":""},"categories":[1],"tags":[649,4,648],"class_list":["post-15604","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-dfm-pcb","tag-pcb","tag-pcb-dfm"],"yoast_head":"\nSolder Mask Design - 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