18 discolored enig finish results

PCB Assembly Technology Roadmap | Imagineering

Imagineering, Inc. | https://www.pcbnet.com/capabilities/assembly/technology-roadmap/

• Inner Layer - 10 oz • Inner Layer - 16 oz Buried/Blind Via 10+N+10 (HDI) Plasma Desmear Yes Outline Tolerance +/-.004 Surface Finish • HASL • ENIG • Immersion Silver • OSP (ENTEK) • Carbon • Immersion Tin • Electrolyic Gold • ENEPIG • ENIPIG Impeadance Control

Imagineering, Inc.

PCB Fabrication Technology Roadmap | Imagineering

Imagineering, Inc. | https://www.pcbnet.com/capabilities/fabrication/technology-roadmap/

• Inner Layer - 10 oz • Inner Layer - 16 oz Buried/Blind Via 10+N+10 (HDI) Plasma Desmear Yes Outline Tolerance +/-.004 Surface Finish • HASL • ENIG • Immersion Silver • OSP (ENTEK) • Carbon • Immersion Tin • Electrolyic Gold • ENEPIG • ENIPIG Impeadance Control

Imagineering, Inc.

. Original circuits were HASL, new products have ENIG Question: •  Will this create any gold embrittlement with the use of ENIG? 2 Question #1 •  From IPC 6012 Table 3-2 Final Finish and Coating Requirements, the parameters for ENIG coating is as shown

| https://www.eptac.com/wp-content/uploads/2016/08/eptac_08_17_16.pdf

. Original circuits were HASL, new products have ENIG Question: •  Will this create any gold embrittlement with the use of ENIG? 2 Question #1 •  From IPC 6012 Table 3-2 Final Finish and Coating Requirements, the parameters for ENIG coating is as shown

| https://www.eptac.com/wp-content/uploads/2021/11/eptac_08_17_16.pdf

 Time above liquidus, 60 – 90 sec and 90 to 120 seconds  Board finish, ENIG and OSP 25 Initial Results  Lower peak temp and shorter TAL did not result in acceptable solder joints 26 Results

| https://www.eptac.com/wp-content/uploads/2021/11/webinar_eptac_12_17_08.pdf

Beyond the Surface: A Peek into How PCBs Are Made

Imagineering, Inc. | https://www.pcbnet.com/blog/how-pcbs-are-made/

. Common types of surface finishes are: HASL (Hot Air Solder Leveling): A cost-effective finish that enhances solderability and protects copper. ENIG

Imagineering, Inc.

Understanding the PCB Fabrication Process: From Design to Delivery

Imagineering, Inc. | https://www.pcbnet.com/blog/understanding-the-pcb-fabrication-process-from-design-to-delivery/

. For example, electroless nickel immersion gold (ENIG) is a common surface finish due to its long shelf life and RoHS compliance . However, it’s more expensive than other options

Imagineering, Inc.

” in ENIG and ENEPIG by using “Reduction Assisted Immersion Gold” in place of “Standard Immersion Gold” *George Milad, Jon Bengston and Albin Gruenwald, Uyemura International Corporation Inspection Technologies Refreshment Break Lunch Break Refreshment Break Day One Concludes Women's Leadership Program

40731 | https://www.smta.org/smtai/SMTAI-2019-Technical-Program.pdf?v=200609010628

Surface Mount Technology Association (SMTA)

40731

” in ENIG and ENEPIG by using “Reduction Assisted Immersion Gold” in place of “Standard Immersion Gold” *George Milad, Jon Bengston and Albin Gruenwald, Uyemura International Corporation Inspection Technologies Refreshment Break Lunch Break Refreshment Break Day One Concludes Women's Leadership Program

40731 | https://www.smta.org/smtai/SMTAI-2019-Technical-Program.pdf?v=200622100619

Surface Mount Technology Association (SMTA)

40731

Journal of SMT Articles

Surface Mount Technology Association (SMTA) | https://www.smta.org/knowledge/journal.cfm

ELECTRONICS ASSEMBLY Alan Rae Abstract 18-2 RELIABILITY ANALYSIS OF SOME CERAMIC LEAD-FREE SOLDER ATTACHMENTS Olli Salmela et al. Abstract 18-2 FLEXURAL STRENGTH OF BGA SOLDER JOINTS WITH ENIG SUBSTRATE FINISH USING 4-POINT BEND TEST Anurag Bansal, Sam Yoon

Surface Mount Technology Association (SMTA)