October 2008 Issue Print E-mail
User Rating: / 2
PoorBest 
Written by Administrator   
Tuesday, 30 September 2008 19:00
October 2008 cover

FEATURES

  • Medical Electronics Assembly
    ‘Checking Up’ on Medical Electronics
    Medical electronics assembly demands a different set of criteria than do commercial PCBs. The US FDA requires specific documentation, especially for verification of certain processes. Today’s medical electronics assembly also requires special testing, avoiding obsolete components and a detailed evaluation of a Pb-free product, as a looming EU RoHS Directive is expected to include medical electronics.
    By Zulki Khan

  • Cover Story
    Solder Ball Attachment Using Laser Soldering
    Reballing BGAs due to rework and conversion from RoHS-compliant solders to SnPb (or vice-versa) typically requires subjecting the component to additional reflow cycles beyond component manufacturer recommendations. Laser attachment or laser reballing in an oxygen-free bath eliminates two additional temperature excursions and provides improved component reliability by facilitating the use of standard assembly reflow temperatures without mixed alloys.
    By Joshua Muonio and Richard Stadem

  • Components
    Improving QFN Reliability
    The proper amount of solder is needed to ground the bottom of a QFN package and simultaneously create a toe fillet. Too much solder on the ground plane can cause parts to float; too little means insufficient grounding. This article focuses on the toe fillet and bottom connection, which create a kind of two-pronged connector, providing electrical continuity from both points.
    By Joseph G. Ameen and Gilson V. Geralde

FIRST PERSON

MONEY MATTERS

TECH TALK

DEPARTMENTS

Industry News
Market Watch
Product Spotlight
Ad Index
Assembly Insider

On the cover: A laser reballing process can cut two temperature excursions. (Photos courtesy General Dynamics)

Last Updated on Friday, 31 October 2008 06:30
 

Columns

Eastern-US: China’s New Competitor?

Parity emerges among EMS Factories from Asia, Mexico and the US.

For the first time in years we see parity in the Eastern US among EMS factories from Asia, Mexico and the US. This EMS market condition will permit American OEMs (the EMS industry refers to OEMs as customers) to have more EMS pathways to choose from. Now more than ever, such EMS assignments will require deeper investigation relating to the OEMs’ evaluation of manufacturing strategies.

Read more...
 
The Human Touch

For those who count on the electronics industry for big feats, it’s been a remarkable couple of years.

Read more...
 

Features

Advances in Concentration Monitoring and Closed-Loop Control

Contaminated bath water skews refractive index results. New technology can accurately measure aqueous cleaning agent concentration.

Read more...
 
Circuits Disassembly: Materials Characterization and Failure Analysis

A systematic approach to nonconventional methods of encapsulant removal.

Read more...
 

Search

Search

Login

CB Login

Language

Language

English French German Italian Portuguese Russian Spanish
 

Products

Panasonic Debuts PanaCIM Maintenance with Augmented Reality
PanaCIM Maintenance with Augmented Reality software provides instant communication and information to factory technicians -- when and where it is needed -- so they can respond to factory needs more...