DuPont

Round Robin of High Frequency Test Methods by IPC-D24C Task Group

Jun 29, 2017 | Glenn Oliver, Jonathan Weldon - DuPont, Chudy Nwachukwu - Isola, John Coonrod - Rogers Corporation, John Andresakis - Park Electrochemical, David L. Wynants, Sr. - Taconic Advanced Dielectric Division

Currently there is no industry standard test method for measuring dielectric properties of circuit board materials at frequencies greater than about 10 GHz. Various materials vendors and test labs take different approaches to determine these properties. It is common for these different approaches to yield varying values of key properties like permittivity and loss tangent. The D-24C Task Group of IPC has developed this round robin program to assess these various methods from the "bottom up" to determine if standardized methods can be agreed upon to provide the industry with more accurate and valid characteristics of dielectrics used in high-frequency and high-speed applications....

Advances in Conductive Inks across Multiple Applications and Deposition Platforms

Dec 27, 2012 | Scott E. Gordon, Jay R. Dorfman, Daniel Kirk, Kerry Adams

Printed Electronics is generally defined as the patterning of electronic materials, in solution form, onto flexible substrates, omitting any use of the photolithography, etching, and plating steps commonly found within the Printed Circuit Board (PCB) industry. The origins of printed electronics go back to the 1960s, and close variants of several original applications and market segments remain active today. Through the 1980s and 1990s Printed Electronic applications based on Membrane Touch Switch and Electroluminescent lighting technologies became common, and the screen printed electronic materials used then have formed the building blocks for many of the current and emerging technologies and applications... First published in the 2012 IPC APEX EXPO technical conference proceedings....

Thick Film Polymer Resistors Embedded in Printed Circuit Boards

Apr 15, 2010 | Lynne Dellis, M S Chan, Tom Dueber, Shane Fang, John Summers; DuPont Electronic Technologies

The high level of current interest in embedded passives in printed circuit boards is driven by the tremendous pressure to pack more circuitry into smaller spaces. However, adoption has been limited due to design, prototyping and infrastructure issues, as well as the stability and tolerances necessary for widespread replacement of discretes. The focus of this work has been to develop a polymer thick film resistor technology to incorporate reliable organic resistors inside printed wiring boards using standard PWB processing....

Managing the transition on a global scale -- changing the cleaning agent means changes to equipment, processes, process control specifications and standards.

May 09, 1999 | William G. Kenyon, Sr. Research Associate

The production of electronics began with hand soldering, followed by manual cleaning, which reached its peak during the NASA program. Each step in the process tended to be considered on a stand alone basis, without thought being given to the preceding and following steps. Since each step had its own set of specifications, this led to a "patchwork" approach to overall quality....