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Effects of Reflow Profile and Thermal Conditioning on Intermetallic Compound Thickness for SnAgCu Soldered Joints

Technical Library | 2010-04-29 21:40:37.0

The purpose of this paper is to investigate the effects of reflow time, reflow peak temperature, thermal shock and thermal aging on the intermetallic compound (IMC) thickness for Sn3.0Ag0.5Cu (SAC305) soldered joints.

Flex (Flextronics International)

Gold Embrittlement In Lead-Free Solder.

Technical Library | 2014-08-07 15:13:44.0

Gold embrittlement in SnPb solder is a well-known failure mechanism in electronic assembly. To avoid this issue, prior studies have indicated a maximum gold content of three weight percent. This study attempts to provide similar guidance for Pb-free (SAC305) solder. Standard surface mount devices were assembled with SnPb and SAC305 solder onto printed boards with various thicknesses of gold plating. The gold plating included electroless nickel immersion gold (ENIG) and electrolytic gold of 15, 25, 35, and 50 microinches over nickel. These gold thicknesses resulted in weight percentages between 0.4 to 7.0 weight percent.

DfR Solutions

Pad Cratering Susceptibility Testing with Acoustic Emission

Technical Library | 2015-08-13 15:52:40.0

Pad cratering has become more prevalent with the switch to lead free solders and lead free compatible laminates. This mainly is due to the use of higher reflow temperature, stiffer Pb-free solder alloys, and the more brittle Pb-free compatible laminates. However, pad cratering is difficult to detect by monitoring electric resistance since pad cratering initiates before an electrical failure occurs. Several methods have been developed to evaluate laminate materials' resistance to pad cratering. Pad-solder level tests include ball shear, ball pull and pin pull. The detailed methods for ball shear, ball pull, and pin pull testing are documented in an industry standard IPC-9708. Bansal, et al. proposed to use acoustic emission (AE) sensors to detect pad cratering during four-point bend test. Currently there is an industry-working group working on test guidelines for acoustic emission measurement during mechanical testing.

Agilent Technologies, Inc.

A Novel Epoxy Flux On Solder Paste For Assembling Thermally Warped POP

Technical Library | 2017-08-17 12:23:27.0

A novel epoxy flux EF-A was developed with good compatibility with no-clean solder pastes, and imparts high reliability for BGA assembly at a low cost. This compatibility with solder pastes is achieved by a well-engineered miscibility between epoxy and no-clean solder paste flux systems, and is further assured with the introduction of a venting channel. The compatibility enables a single bonding step for BGAs or CSPs, which exhibit high thermal warpage, to form a high-reliability assembly. Requirements in drop test, thermal cycling test (TCT), and SIR are all met by this epoxy flux, EF-A. The high viscosity stability at ambient temperature is another critical element in building a robust and userfriendly epoxy flux system. EF-A can be deposited with dipping, dispensing, and jetting. Its 75°C Tg facilitates good reworkability and minimizes the adverse impact of unfilled underfill material on TCT of BGA assemblies.

Indium Corporation

The Morphology Evolution and Voiding of Solder Joints on QFN Central Pads with a Ni/Au Finish

Technical Library | 2012-10-18 21:58:51.0

First published in the 2012 IPC APEX EXPO technical conference proceedings. In this paper, we report on a comprehensive study regarding the morphology evolution and voiding of SnAgCu solder joints on the central pad of two different packages – QFN and an Agilent package called TOPS – on PCBs with a Ni/Au surface finish.

Agilent Technologies, Inc.

Effect of Gold Content on the Microstructural Evolution of SAC305 Solder Joints Under Isothermal Aging

Technical Library | 2013-08-29 19:52:43.0

Au over Ni on Cu is a widely used printed circuit board (PCB) surface finish, under bump metallization (UBM), and component lead metallization. It is generally accepted that less than 3 wt.% Au in Sn-Pb solder joints inhibits formation of detrimental intermetallic compounds (IMC). However, the critical limit for Au content in Pb-free solder joints is not well established. Three surface-mount package platforms, one with a matte Sn surface finish and the others with Ni/Au finish, were soldered to Ni/Au-finished PCB using Sn-3.0Ag 0.5Cu (SAC305) solder, in a realistic manufacturing setting. The assembled boards were divided into three groups: one without any thermal treatment, one subjected to isothermal aging at 125°C for 30 days, and the third group aged at 125°C for 56 days...

Agilent Technologies, Inc.

Effect of Reflow Profile on SnPb and SnAgCu Solder Joint Shear Force

Technical Library | 2007-03-08 19:31:10.0

Reflow profile has significant impact on solder joint performance because it influences wetting and microstructure of the solder joint. The degree of wetting, the microstructure (in particular the intermetallic layer), and the inherent strength of the solder all factor into the reliability of the solder joint. This paper presents experimental results on the effect of reflow profile on both 63%Sn 37%Pb (SnPb) and 96.5%Sn 3.0%Ag 0.5%Cu (SAC 305) solder joint shear force.

Henkel Electronic Materials

Drop Impact Reliability of Edge-bonded Lead-free Chipscale Packages

Technical Library | 2010-03-30 21:51:23.0

This paper presents the drop test reliability results for edge-bonded 0.5mm pitch lead-free chip scale packages (CSPs) on a standard JEDEC drop reliability test board.

Flex (Flextronics International)

Broadband Printing - A Paradigm

Technical Library | 2008-12-03 19:39:00.0

This paper presents the analysis from a recent printing study employing a test vehicle that includes components such as 01005s to QFPs. In a recent publication, part of this study was presented focusing on 01005 printing only. This printing process was determined to be suitable for 01005s assembly and also analyzed based on statistical capability. The current paper will present the results from additional detailed analysis to determine if this process has the capability to provide sufficient solder paste deposits for larger components located on the same test board. In the future, the SMT industry may always look towards “Broadband Printing” as an alternative to dual stencil or stepped stencil printing technologies in order to meet the needs of both small and large components.

Speedline Technologies, Inc.

Use lead-free alloy wire during rework for Leaded Process

Electronics Forum | Wed Nov 08 19:49:41 EST 2006 | davef

Dr. Brian Toleno wrote that section of the posting that I pasted onto the forum. Try: * �Lead-free Soldering Backward Compatibility�, Pan, et al., IPC/JEDEC Pb-free Conference, San Jose, 2006 * Checking with http://www.ipc.org * Contacting Jianbia

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