Reliability of Flex Coatings for High-Performance Applications

1993 ◽  
Vol 323 ◽  
Author(s):  
H. Tong ◽  
C. Wilson ◽  
T. Graham ◽  
L. Shi
Keyword(s):  
Thin Film ◽  
Thermal Cycling ◽  
High Performance ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Polymeric Coatings ◽  
Printed Circuit ◽  
Thin Film Silicon ◽  
Edge Connector

AbstractA study was undertaken to select a suitable coating for a high-pin-count flexible edge connector (Flex) that interconnected a multichip thin-film silicon carrier to a printed circuit board. The Flex with cantilevered inner leads were joined to the contact pads at the perimeter of the carrier. 15 polymeric coatings were evaluated by subjecting coated Flexes to tests consisting of inner lead bending, temperature/humidity/bias (85°C/80%/15 V/350 hours), corrosion, line peel, and/or pressure cooker (126°C/20 psig/120 hours). Inner lead bending measurements were performed to assess the potential of lead shorting at the inner lead bonding sites during thermal cycling. From this study, a low-stress silicone evolved as the best candidate. The results leading to this conclusion will be shown and discussed.

High Performance Electrostatic Air Valves Formed by Thin-Film Lamination

1999 ◽  
Author(s):  
David K. Biegelsen ◽  
Patrick Cheung ◽  
Lars E. Swartz ◽  
Warren B. Jackson ◽  
Andrew A. Berlin ◽  
...  
Keyword(s):  
Thin Film ◽  
Laser Cutting ◽  
High Performance ◽  
Printed Circuit Board ◽  
Response Times ◽  
Pressure Differential ◽  
Circuit Board ◽  
Drive Voltage ◽  
Printed Circuit ◽  
Air Flows

Abstract Electrostatic flap valves for rapidly modulating air flows through directed jets have been fabricated by simple lamination techniques as extensions to standard printed circuit board technology. The flaps have thicknesses of a few microns whereas the lateral dimensions are several millimeters. The laser cutting and lamination processes are described here and the characteristics of the valves are presented. Flow rise and fall times of order 1 ms are demonstrated, the variations of response times with drive voltage and pressure differential are shown, and lifetimes greater than 4 × 108 are reported.

scholarly journals HIGH-PERFORMANCE FLEXIBLE FORCE AND TEMPERATURE SENSING ARRAY WITH A ROBUST STRUCTURE

2013 ◽  
Vol 24 ◽  
pp. 1360014
Author(s):  
MIN-SEOK KIM ◽  
HAN-WOOK SONG ◽  
YON-KYU PARK
Keyword(s):  
High Performance ◽  
Sensor Array ◽  
Printed Circuit Board ◽  
High Spatial Resolution ◽  
Tactile Sensor ◽  
Circuit Board ◽  
Micro Fabrication ◽  
Printed Circuit ◽  
Flexible Printed Circuit ◽  
Physical Quantities

We have developed a flexible tactile sensor array capable of sensing physical quantities, e.g. force and temperature with high-performances and high spatial resolution. The fabricated tactile sensor consists of 8 × 8 force measuring array with 1 mm spacing and a thin metal (copper) temperature sensor. The flexible force sensing array consists of sub-millimetre-size bar-shaped semi-conductor strain gage array attached to a thin and flexible printed circuit board covered by stretchable elastomeric material on both sides. This design incorporates benefits of both materials; the semi-conductor's high performance and the polymer's mechanical flexibility and robustness, while overcoming their drawbacks of those two materials. Special fabrication processes, so called “dry-transfer technique” have been used to fabricate the tactile sensor along with standard micro-fabrication processes.

Recent Advances and Trends in Fan-Out Wafer/Panel-Level Packaging

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
John H. Lau
Keyword(s):  
Thermal Cycling ◽  
Thermal Performance ◽  
Printed Circuit Board ◽  
Circuit Board ◽  
Direct Imaging ◽  
Printed Circuit ◽  
Thermal Cycling Condition ◽  
Recent Advances ◽  
Cycling Condition

The recent advances and trends in fan-out wafer/panel-level packaging (FOW/PLP) are presented in this study. Emphasis is placed on: (A) the package formations such as (a) chip first and die face-up, (b) chip first and die face-down, and (c) chip last or redistribution layer (RDL)-first; (B) the RDL fabrications such as (a) organic RDLs, (b) inorganic RDLs, (c) hybrid RDLs, and (d) laser direct imaging (LDI)/printed circuit board (PCB) Cu platting and etching RDLs; (C) warpage; (D) thermal performance; (E) the temporary wafer versus panel carriers; and (F) the reliability of packages on PCBs subjected to thermal cycling condition. Some opportunities for FOW/PLP will be presented.

Dielectric and Hot/Wet Properties of Methyl-Silsesquioxane/Cyanate Ester Resin Hybrid Materials

2011 ◽  
Vol 216 ◽  
pp. 630-634
Author(s):  
Zeng Ping Zhang ◽  
Yong Wen ◽  
Hong Zhao Du ◽  
Jian Zhong Pei ◽  
Shuan Fa Chen
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
High Performance ◽  
Printed Circuit Board ◽  
Cyanate Ester ◽  
Circuit Board ◽  
Printed Circuit ◽  
Cyanate Ester Resin ◽  
Properties Of Materials

Methylsilsesquioxane (Me-SSQ) was incorporated into cyanate ester resin (CE) to obtain organic-inorganic hybrids with better dielectric properties in this study. First, methyltriethoxysilane was hydrolyzed and condensed to synthesize Me-SSQ. Then several Me-SSQ/CE hybrids containing different contents of Me-SSQ were prepared. The effect of Me-SSQ content on the dielectric and hot/wet properties of materials was investigated. Results showed that the Me-SSQ/CE hybrid containing 20wt% of Me-SSQ shows a dielectric constant of 2.78, which is much lower than the pure CE resin. At the same time, the dielectric loss of the Me-SSQ/CE hybrids was slightly increased (tanδ<0.006). It indicates that Me-SSQ/CE hybrid is a promising matrix materials for high-performance printed circuit board (PCB).

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