Circuit World: Volume 21 Issue 4

Microstructure of Conductive Anodic Filaments Formed during Accelerated Testing of Printed Wiring Boards

W.J. Ready, S.R. Stock, G.B. Freeman, L.L., L.J. Turbini

Under certain environmental conditions, printed wiring boards (PWBs) respond to applied voltages by developing sub‐surface deposits of copper salts extending from anode to cathode…

A Model of the Solder Flux Reaction; Reactions at the Metal/ Metal Oxide/Electrolyte Solution Interface

M. Nasta, H.C. Peebles

A good solder flux must simultaneously perform a number of important functions. It must promote thermal transfer to the area of the solder joint, enhance wetting of the solder on…

Low Cost Solder Bumped Flip Chip MCM‐L Demonstration

M. Kelly, J. Lau

A low cost multichip module employing solder bumped flip chips mounted on an organic substrate was demonstrated. This functional prototype was used to help assess the preliminary…

Some Fundamental Aspects of UV Laser Direct Imaging

J.H. Choi

Photoresist imaging traditionally uses silver halide or diazo based phototools for contact exposure to an actinic UV light source. By contrast, laser direct imaging uses digital…

Weak Organic Acids and Surface Insulation Resistance

J.E. Sohn, U. Ray

Weak organic acids (WOAs) are commonly used as activators in no‐clean fluxes. Surface insulation resistance (SIR) was determined as a function of WOA type and residue level…

Heat Conductive Wire Matrix Board for Light Emitting Diode (LED) Dot Matrix Display

S. Asai, H. Sawa, K. Kato

A wire matrix has been developed for mounting LED dot matrix displays whereby insulated wires are ‘woven’ to produce a matrix that is fixed on an aluminium board with epoxy…

IPC Printed Circuits Expo/38th annual meeting: San Diego, 29 April‐4 May 1995

Brian N. Ellis

This event is not just one event but a whole series of them running more or less concurrently. The main parts consist of meetings of the various IPC Technical Committees and their…

Irlandus Circuits Ltd, Craigavon, N. Ireland

Doug Popkiss

Situated on the southern shore of Lough Neagh, the largest freshwater lake in the British Isles, is the new city of Craigavon, home of PCB manufacturer, Irlandus Circuits. By way…

PCIF News

Formed by Andrew Hall following interest at the Fabricators' Group Meeting in the November 1994 PCIF Senior Management Session, the Bare Board Test Working Group is the latest…

International institute news

As reported in the last issue of Circuit World, the Association has started the year with a major push to support those members involved in the export market.

Industry news

Orbotech SA, Brussels, has announced the appointment of Kevin Smith as Sales Executive for its UK office. Mr Smith joints Orbotech with several years' experience in the…

New products

Probot's new Super Six‐D double‐sided bare board moving probe tester utilises four moving probes for prototype and low‐volume testing of very dense fine‐line SMT and MCM products…