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Specialty materials for SMT Assembly. Solder Paste, Spheres, Tac Fluxes, Flip Chip Fluxes, Solder wi
Electronics Forum | Fri Aug 13 16:54:20 EDT 2004 | davef
If the terminations on your components are not barrier plated, you must be very careful about the amount of time you stay above liquidous. As you'd expect, longer is not better. The longer you stay at liquidous, the more of the component terminatio
Electronics Forum | Tue Aug 30 09:24:08 EDT 2005 | Slaine
we manufacture a range of ceramic parts that have silver termination,there is already a small leaching problem (absorption of the termination by the solder in liquid form)with Sn62 that we live with, having to implement unleaded solder they are norma
Industry News | 2018-10-18 08:46:25.0
"Lead-Free" Semiconductor Industry
Industry News | 2002-12-03 15:00:11.0
Practical Components adds new formulations
Technical Library | 2023-08-04 15:27:30.0
A designed experiment evaluated the influence of several variables on appearance and strength of Pb-free solder joints. Components, with leads finished with nickel-palladium-gold (NiPdAu), were used from Texas Instruments (TI) and two other integrated circuit suppliers. Pb-free solder paste used was tin-silver-copper (SnAgCu) alloy. Variables were printed wiring board (PWB) pad size/stencil aperture (the pad finish was consistent; electrolysis Ni/immersion Au), reflow atmosphere, reflow temperature, Pd thickness in the NiPdAu finish, and thermal aging. Height of solder wetting to component lead sides was measured for both ceramic plate and PWB soldering. A third response was solder joint strength; a "lead pull" test determined the maximum force needed to pull the component lead from the PWB. This paper presents a statistical analysis of the designed experiment. Reflow atmosphere and pad size/stencil aperture have the greatest contribution to the height of lead side wetting. Reflow temperature, palladium thickness, and preconditioning had very little impact on side-wetting height. For lead pull, variance in the data was relatively small and the factors tested had little impact.
Technical Library | 2012-12-13 21:20:05.0
First published in the 2012 IPC APEX EXPO technical conference proceedings. We investigated the micro-void formation of solder joints after reliability tests such as preconditioning (precon) and thermal cycle (TC) by varying the thickness of Palladium (Pd) in Electroless Nickel / Electroless Palladium / Immersion Gold (ENEPIG) surface finish. We used lead-free solder of Sn-1.2Ag-0.5Cu-Ni (LF35). We found multiple micro-voids of less than 10 µm line up within or above the intermetallic compound (IMC) layer. The number of micro-voids increased with the palladium (Pd) layer thickness. Our results revealed that the micro-void formation should be related to (Pd, Ni)Sn4 phase resulted from thick Pd layer. We propose that micro-voids may form due to either entrapping of volatile gas by (Pd, Ni)Sn4 or creeping of (Pd, Ni)Sn4.
Influence of Pd Thickness on Micro Void Formation of Solder Joints in ENEPIG Surface Finish SMTnet Express December 13, 2012, Subscribers: 26067, Members: Companies: 9068, Users: 34058 Influence of Pd Thickness on Micro Void Formation of Solder
SMTnet Express, March 10, 2016, Subscribers: 24,118, Companies: 14,735, Users: 39,803 Acceptance Testing Of Low-Ag Reflow Solder Alloys Kris Troxel, Aileen Allen, Elizabeth Elias Benedetto, Rahul Joshi; HP Inc. Since the implementation
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2018/07/leadfree.pdf
Procured specially prepared components with no lead metalization. Either tin, palladium silver or nickel. ♦ For BGAs, removed tin/lead balls and re-balled with tin/silver balls. ♦
Surface Mount Technology Association (SMTA) | https://www.smta.org/knowledge/journal.cfm
Suthakaran, Russell Brush, Doug Perovic Abstract 31-1 Influence of Electroless Pd Plating Film Thickness on Solder Joint Relibility of ENEPIG Yoshinori Ejiri, Takehisa Sakurai, Yoshinori Arayama, Yoshiaki
