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SMTAI 2009 Call For Papers Reminder

Industry News | 2009-01-23 19:18:23.0

You are invited to submit a paper to the electronic industry's premier forum on the manufacture of electronic products utilizing surface mount and related technologies.

Surface Mount Technology Association (SMTA)

Seven IPC APEX EXPO™ Technical Conference Sessions Go Global - Live From Las Vegas

Industry News | 2011-01-20 13:45:14.0

IPC will introduce a cyber conference at IPC APEX EXPO in Las Vegas in 2011. The IPC APEX EXPO Cyber Conference will feature live broadcasts and post-show archives of seven of the show's thirty-five technical conference sessions on April 12–14, 2011.

Association Connecting Electronics Industries (IPC)

2003 Designers Learning Symposiums Take Shape

Industry News | 2003-09-11 16:50:12.0

The printed circuit board industry is an ever-changing marketplace. The technologies of today certainly aren�t standing still, and neither should today�s PCB designer

Association Connecting Electronics Industries (IPC)

Innovative Technology Center at IPC APEX EXPO Highlights Leading Edge Technologies.

Industry News | 2010-03-27 19:26:29.0

BANNOCKBURN, Ill., USA, - IPC - Association Connecting Electronics Industries® announces the products that will be featured in the Innovative Technology Center (ITC) at IPC APEX EXPO™, April 6–8, 2010, in Las Vegas. Assessed by an IPC Review Board of industry experts, the products were selected based on their representation of a new or emerging technology of significant value and relevance to the electronics manufacturing industry.

Association Connecting Electronics Industries (IPC)

COTS Cooling

Technical Library | 2019-05-31 14:15:01.0

ACI Technologies (ACI) is working on a project where one of the challenges is removing a large quantity of heat from audio amplifier circuits. This challenge is further complicated in that the heat generating circuits are located in a rack mounted box that needs to be shielded from electro-magnetic interference (EMI). Mechanically, this means that there cannot be open passages into the rack mounted box. We will first review the basic types of cooling available as commercial off-the-shelf (COTS) systems for the electronics industry, then discuss the pros and cons of each for different applications, and finally reveal the criteria and solution for the ACI project.

ACI Technologies, Inc.

Pad Cratering

Technical Library | 2020-05-08 18:22:31.0

A customer contacted the Helpline to perform analysis on a lead-free assembly which exhibited intermittent functionality. The lead-free assembly exhibiting intermittent functionality when pressure was applied to the ball grid array (BGA) packages. Industrial adaptation of a Restriction of Hazardous Substances (RoHS) compliant solder standard has created a new host of failure modes observed in lead-free assemblies. Pad cratering occurs when fractures propagate along the epoxy resin layer on the underside of the BGA connecting pads. While originating from process, design, and end use conditions, it is the combination of a rigid lead-free solder with inflexible printed circuit board (PCB) laminates that has advanced the prevalence of this condition. Pad cratering is simply the result of mechanical stress exceeding material limitations.

ACI Technologies, Inc.

BGA Placement on Rework Station

Technical Library | 2019-06-12 10:33:58.0

The success of ball grid array (BGA) placement on electronic assemblies is as much a matter of proper preparation and planning, as it is technique. In some designs, it is more appropriate to apply BGAs using a rework station that isolates the placement of the device, without subjecting the entire assembly to thermal reflow. This is especially beneficial in board constructions where the number of BGAs is limited, and the application of the solder paste is difficult, due to small pitch features that stretch the limitation of the stencil construction. Another application for rework stations, involves very large and thermally conductive BGAs, which will not uniformly reflow with other components on the assembly, and may require special process parameters for their proper placement. The most common use of BGA rework stations are for assemblies requiring BGA removal and replacements due to failures in the initial assembly stage.

ACI Technologies, Inc.

Die Attach Dispensing Methods

Technical Library | 2019-05-21 17:20:36.0

Die attach material selection and process implementation play crucial roles in any microelectronic assembly. The chosen attach methods ultimately affect die stress, functionality, thermal management, and reliability of the assembly. Die attach applications are designed to optimize mechanical attachment of the die to the substrate, to create a thermal path from the die to the substrate, and to create an electrical path for a ground plane connection. Some of the more commonly used die attach materials in the microelectronics industry today are epoxies,polyimides, thermoplastics, silicones, solders, and special low outgassing, low stress, anisotropic adhesives.

ACI Technologies, Inc.

Pad Cratering

Technical Library | 2020-05-08 18:22:31.0

A customer contacted the Helpline to perform analysis on a lead-free assembly which exhibited intermittent functionality. The lead-free assembly exhibiting intermittent functionality when pressure was applied to the ball grid array (BGA) packages. Industrial adaptation of a Restriction of Hazardous Substances (RoHS) compliant solder standard has created a new host of failure modes observed in lead-free assemblies. Pad cratering occurs when fractures propagate along the epoxy resin layer on the underside of the BGA connecting pads. While originating from process, design, and end use conditions, it is the combination of a rigid lead-free solder with inflexible printed circuit board (PCB) laminates that has advanced the prevalence of this condition. Pad cratering is simply the result of mechanical stress exceeding material limitations.

ACI Technologies, Inc.

Flip Chip Rework

Technical Library | 2019-05-21 17:34:08.0

Flip chip components have been gaining popularity in the electronics industry since their introduction in the 1960s. Advances in attach methods and adhesives, as well as the drive for smaller and faster electronic devices made the technology take off. The basic premise of the flip chip is that the chip (semiconductor device) is mounted flipped from the traditional position. The traditional method of mounting a die is to mount it on a lead frame with the circuit and bond pads face up. The bond pads then receive a bond wire which then connects to the proper lead on the lead frame. Flip chips are mounted face down onto a substrate using small bumps on the bond pads to make direct electrical connection to their respective pads on the substrate. Stay tuned for more information on attachment techniques next month. This article will focus on how to rework flip chips.

ACI Technologies, Inc.


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