Technical Library: mixing sn100 with sac305 (Page 1 of 1)

Reliability of Reworked QFNs

Technical Library | 2014-09-11 11:43:48.0

In this DOD study the reliability of reworked QFNs is studied with the outcome being that a stay in place stencil does not impact the reliability of a QFN reworked using this technique

BEST Inc.

Creating Solder Joint Reliability with SnCu Based Solders Some Practical Experiences

Technical Library | 2009-01-15 00:42:58.0

Tin-silver-copper has received much publicity in recent years as the lead-free solder of choice. SAC305 was endorsed by the IPC Solder Value Product Council in the United States as the preferred option for SMT assembly; most assemblers have transitioned to this alloy for their solder paste requirements. The SAC305 alloy due to its 3.0% content of silver is expensive when compared to traditional 63/37 for this reason many wave assemblers are opting for less costly options such as tin-copper based solders for their wave, selective and dip tinning operations.

Kester

Thermal Shock and Drop Test Performance of Lead-free Assemblies with No-Underfill and Corner-Underfill

Technical Library | 2014-01-02 15:56:55.0

With ROHS compliance the transition to lead-free is inevitable. Several lead-free alloys are available in the market and its reliability has been the main concern. The results from this experimental research aims at making a comparison of different lead-free alloy combinations. Thermal shock and drop tests are a part of this experimental study.

Jet Propulsion Laboratory

Miniaturization with Help of Reduced Component to Component Spacing

Technical Library | 2015-03-12 18:26:16.0

Miniaturization and the integration of a growing number of functions in portable electronic devices require an extremely high packaging density for the active and passive components. There are many ways to increase the packaging density and a few examples would be to stack them with Package on Package (PoP), fine pitch CSP's, 01005 and last but not least reduced component to component spacing for active and passive components (...)This paper will discuss different layouts, assembly and material selections to reduce component to component spacing down to 100-125um (4-5mil) from today’s mainstream of 150-200um (6-8mil) component to component spacing.

Flex (Flextronics International)

Jetting of Isotropic Conductive Adhesives with Silver Coated Polymer Particles

Technical Library | 2018-12-26 10:31:05.0

The development of novel interconnection materials for production of electronics is of considerable interest to fulfill increasing demands on interconnect reliability in increasingly demanding environments with respect to temperature extremes, mechanical stresses and/or production limitations. Adhesives are playing an increasingly significant role in the continuously evolving electronics industry. (...)Specific applications will be presented that highlight the feasibility of the technology with respect to conductivity, structural reliability and lifetime standards. The deposition of the novel ICA has been performed using a jet printing technology to ensure both precise and accurate positioning, size and volume delivery.

Mycronic Technologies AB

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.

Voiding Performance with Solder Pastes Containing Modified SAC Alloys for Automotive Applications in Bottom Terminated Component Assemblies

Technical Library | 2019-07-24 23:55:32.0

Voiding is a key concern for components with thermal planes because interruptions in Z-axis continuity of the solder joint will hinder thermal transfer. When assembling components with solder paste, there is a high propensity for voiding due to the confined nature of the solder paste deposits under the component. Once reflowed, many factors contribute to the amount of voiding in a solder joint such as the reflow profile, designs of the component, board and stencil, and material factors. This study will focus on the solder paste alloy and flux combination as well as profile and board surface finishes.

Indium Corporation

Cold Ball Pull Test Efficiency for the PCB Pad Cratering Validation with the Ultra Low Loss Dielectric Material

Technical Library | 2019-05-08 21:52:28.0

Cold ball pull testing is used to validate the resistance of PCB pad cratering for the different ultra-low loss dielectrics materials (Dk=3~4.2 and Df

iNEMI (International Electronics Manufacturing Initiative)

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