Technical Library: paul (Page 2 of 4)

Lead-free Wave Soldering of Simple to Highly Complex Boards. Process Optimization

Technical Library | 2008-01-10 19:24:48.0

This research takes an in-depth look at the challenges encountered in developing a lead free wave soldering process based on the specific products as well as on specific materials. It attempts to provide the reader with the information necessary to make educated decisions in selecting materials and controlling various process parameters in order to execute a rational implementation strategy for a reliable and robust lead free wave soldering process.

Vitronics Soltec

Selective Soldering Process

Technical Library | 2008-01-24 21:42:39.0

Although many through-hole components are being replaced by their surface mount (SMT) counterparts, printed circuit boards (PCBs) are still being designed with both types of components. Often, there are interconnect hardware, displays, or other components that cannot withstand the exposure to the high temperature involved in the wave soldering process. They are generally soldered by hand. The challenge is to determine the optimal method manufacturers can use to solder these boards populated with mixed technology.

Electronics Manufacturing Productivity Facility (EMPF)

Solder Paste Inspection Technologies: 2D-3D Correlation

Technical Library | 2008-05-28 18:41:53.0

This paper describes correlation between a true 2D area measurement (e.g. printer) and a height map generated area from a SPI system. In addition, this paper will explore the correlation between area/volume measurements and bridge detection between 2D/3D techniques. The ultimate goal is to arm the process engineers with information that can be used to make decision that will impact defects, cost, throughput and Return On Investment.

Speedline Technologies, Inc.

Flexible Termination - Reliability in Stringent Environments

Technical Library | 2009-05-21 13:41:05.0

Failure due to board flex cracks persists as the dominant failure mode in multi-layer ceramic capacitors (MLCC). (...) This paper is intended to show the impact of temperature cycling, high-temperature life tests, and multiple bend exposures to the MLCC with this flexible termination.

KEMET Electronics Corporation

Solder Preform Basics

Technical Library | 2009-12-14 20:27:54.0

Solder paste is the most recognized form of solder used in electronics assembly today. A surface mount application depends on solder paste to attach the components to the circuit board. However, solder paste may not be the only solution. This is especially true when working with through-hole components or very large devices that require more solder than can be supplied by printed solder paste. In fact, quite often a PCB involves mixed technology that requires more than one form of solder. Solder paste is used for the surface mount components and solder preforms are utilized to attach the leads on through-hole components, avoiding wave or selective soldering.

Indium Corporation

Ceramic to Plastic Packaging

Technical Library | 2010-04-15 22:06:32.0

As electronic products increase in functionality and complexity, there is an emphasis on affordability, miniaturization, and energy efficiency. The telecommunications, automotive, and commercial electronic markets are the leading drivers for these trends. These markets see high volume manufacturing with millions of units priced to the fraction of the cent. The choice of the packaging material for the electrical components for these markets can have a substantial effect on the cost of the final product. Therefore plastic encapsulated components are almost universally used in non-military applications over the conventional ceramic or metal electronic packages.

Electronics Manufacturing Productivity Facility (EMPF)

Reliability Challenges in Fabrication of Flexible Hybrid Electronics for Human Performance Monitors: A System Level Study

Technical Library | 2020-11-10 15:43:25.0

Flexible hybrid electronics (FHE) interface rigid electronic components with flexible sensors, circuits, and substrates. This paper reports the reliability improvement of a FHE Human Performance Monitor (HPM), designed to monitor electrocardiography (ECG) signals.

Stanford University

Dielectric Material Damage Vs. Conductive Anodic Filament Formation

Technical Library | 2021-07-27 14:57:18.0

It should be noted that this is an overview paper that represents the early stages of an ongoing investigation into the causes and effects between conductive anodic filament (CAF) formation and printed wiring board (PWB) material damage. Our belief is that certain or specific types of material damage can increase the propensity for CAF formation. The preliminary data collected suggests is that there is no statistical correlation between the general definition of material damage (cohesive failure) and CAF. The resulting dichotomy is that we find no CAF failures in some coupons that have obvious material damage and we find CAF failures in coupons that don't exhibit material damage.

PWB Interconnect Solutions Inc.

Paper Substrates and Inks for Printed Electronics

Technical Library | 2023-03-13 19:40:21.0

The present work explores the effects of paper properties on conventional silver-based conducting inks. The effects of smoothness, relative humidity, porosity, permeability and wettability on electrical properties of silver inks on different paper substrates were studied. Another objective of this work was to prepare and study polyaniline synthesized in the presence of different lignosulfonates.

Western Michigan University

Using Stencil: Design to Reduce SMT Defects

Technical Library | 2023-06-12 19:46:10.0

Solder paste printing is understood to be the leading contributor of defects in the electronics assembly process. Because yield accounts for such a large percentage of the margin, the greatest opportunity to improve profitability in the assembly of most electronics can be gained by reducing or eliminating solder defects. This article examines process adjustments made through stencil design that correct a misalignment situation between the PCB and stencil, leading to a 43% reduction in assembly defects. Examples of each are found in Table 1.

AVI Precision Engineering Pte Ltd


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