A Novel Placement Method for Mini-Scale Passive Components in Surface Mount Technology

2021 ◽  
Author(s):  
Jingxi He ◽  
Yuqiao Cen ◽  
Yuanyuan Li ◽  
Shrouq Alelaumi ◽  
Daehan Won
Keyword(s):  
Printed Circuit Boards ◽  
Low Cost ◽  
Superior Performance ◽  
Surface Mount Technology ◽  
Solder Paste ◽  
Passive Components ◽  
Surface Mount ◽  
Placement Method ◽  
Pick And Place ◽  
Comparative Results

Abstract This paper aims to propose a novel placing method, i.e., place-between-paste-and-pad (PB), for mini-scale passive components to enhance electronic assembly lines' yield. PB means a component is designed to be placed at the midpoint between the pastes and pads on the length direction while it aligns with the pads' center on the width direction. An experiment that involves 12 printed circuit boards (PCB) is designed and conducted to get comparative results. Four PCBs are employed for place-on-pad (PP), place-on-paste (PPS), and PB separately. On each board, 375 resistors R0402M (0.40 mm X 0.20 mm) are assembled horizontally. To study the components' misalignment under various solder paste offset conditions in different placement methods, a stencil with 25 solder paste offset settings is utilized. Based on this experiment's results, PB has superior performance to the other two methods to minimize components' misalignment. Regarding the number of acceptable components when post-reflow offsets are within 25% of components' dimensions, PB and PP have equivalent performances, and they both outperform PPS. Furthermore, PB is a low-cost placing strategy because PB needs not the real-time communication between the solder paste inspection machine and the pick-and-place machine. With the miniaturization trend in electronic products, the post-reflow components' misalignment is more frequently observed than before. The placement method proposed in this study is expected to offer a low-cost exploration in the component pick-and-place procedure to enhance the surface mount technology (SMT) assembly quality.

scholarly journals A V-Shape Optical Pin Interface for Board Level Optical Interconnect

2018 ◽  
Vol 10 (1) ◽  
pp. 20
Author(s):  
Nur Najahatul Huda Saris ◽  
Osamu Mikami ◽  
Azura Hamzah ◽  
Sumiaty Ambran ◽  
Chiemi Fujikawa
Keyword(s):  
Optical Networks ◽  
Optical Interconnects ◽  
Printed Circuit Boards ◽  
Data Centers ◽  
Low Cost ◽  
Optical Interconnection ◽  
Surface Mount Technology ◽  
Optical Surface ◽  
Printed Wiring Board ◽  
Surface Mount

This paper introduces a new interface of an optical pin for Printed Circuit Boards (PCBs), the V-shape cut type which is an innovation from the 90-degree cut type optical pin. The effectiveness is determined by optical characteristics through OptiCAD and by experiment. The simulation used a model of ray tracing analysis which is a one to two (split) connection function model. For the experiment, a Polymer Optical Fibre (POF) V-shape optical pin has been fabricated. It was found that the V-shaped optical pin has a multi-branched function and is applicable to optical interconnection. Full Text: PDF ReferencesMikami, O., et al. Optical pin interface for 90-deg optical path conversion coupling to Printed Wiring Board. in Region 10 Conference (TENCON), 2016 IEEE. 2016. IEEE. CrossRef DeCusatis, C., Data center architectures, in Optical Interconnects for Data Centers. 2017, Elsevier. p. 3-41. CrossRef Duranton, M., D. Dutoit, and S. Menezo, Key requirements for optical interconnects within data centers, in Optical Interconnects for Data Centers. 2017, Elsevier. p. 75-94. CrossRef ITOH, Y., et al., Optical Coupling Characteristics of Optical Pin with 45° Micro Mirror for Optical Surface Mount Technology. Journal of The Japan Institute of Electronics Packaging, 2001. 4(6): p. 497-503. CrossRef Uchida, T. and O. Mikami, Optical surface mount technology. IEICE Transactions on Electronics, 1997. 80(1): p. 81-87. CrossRef Papakonstantinou, I., et al., Low-cost, precision, self-alignment technique for coupling laser and photodiode arrays to polymer waveguide arrays on multilayer PCBs. IEEE Transactions on Advanced Packaging, 2008. 31(3): p. 502-511. CrossRef Nakama, K., et al., Optical connection device. 2006, Google Patents. DirectLink Ramaswami, R., K. Sivarajan, and G. Sasaki, Optical networks: a practical perspective. 2009: Morgan Kaufmann. DirectLink Tong, X.C., Advanced materials for integrated optical waveguides. 2014: Springer. CrossRef

A novel placement method for mini-scale passive components in surface mount technology

2021 ◽  
Author(s):  
Jingxi He ◽  
Yuqiao Cen ◽  
Yuanyuan Li ◽  
Shrouq M. Alelaumi ◽  
Daehan Won
Keyword(s):  
Surface Mount Technology ◽  
Passive Components ◽  
Surface Mount ◽  
Placement Method

Fine Pitch Surface Mount Technology Assembly with Lead‐free, Low Residue Solder Paste

1995 ◽  
Vol 7 (2) ◽  
pp. 27-32 ◽  
Author(s):  
I. Artaki ◽  
A.M. Jackson ◽  
P.T. Vianco
Keyword(s):  
Lead Free ◽  
Surface Mount Technology ◽  
Solder Paste ◽  
Surface Mount ◽  
Fine Pitch

Low RH and temperature effect on 0201 sized passive components during SMT mounting

2019 ◽  
Vol 32 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Rafiq Asghar ◽  
Faisal Rehman ◽  
Ali Aman ◽  
Kashif Iqbal
Keyword(s):  
Success Rate ◽  
Surface Mount Technology ◽  
Production Environment ◽  
Passive Components ◽  
Content Type ◽  
Surface Mount ◽  
Electrostatic Charges ◽  
Temperature And Humidity ◽  
Chip Size ◽  
Placement Success

Purpose Low relative humidity (RH) effect surface mount devices in numerous ways. The smaller size (0201) capacitor and resistor start wasting when RH is low. Due to low RH, electrostatic charges built-up on the surface of surface mount devices (SMDs) and component’s reel. The positive charged SMDs stick with the negatively charged reel tape and are wasted. This paper comprehensively explores the environmental effects on 0201 size surface mount devices during mounting process. Different type and size of surface mount devices are tested in low and desired RH to validate the effectiveness of the proposed approach. This paper will also highlight high electrostatic discharge (ESD) due to low RH which can be detrimental for small size surface mount devices. The experimental and graphical illustrations will stipulate the results of success rate for mounting components. The effect on ESD, subsequently varying temperature and humidity will also be analyzed. Design/methodology/approach In this paper, 0201 SDMs will be considered for analysis. The surface mount technology (SMT) plant temperature and humidity has been varied to examine the properties of small size SMDs. Total 5 hours production data are collected from Laptop motherboard production environment. This approach is applicable to all SMT environment. Findings The authors reduced the wastage of 0201 chip size resistor and capacitor. Total 11 components are selected of this size, and there success rate is observed during mounting. These components are first observed in harsh environment where the temperature is first set to 20ºC and RH is set to 25 per cent. The success rate of these components is very low due to component’s wastage. When the plant temperature is set to 25ºC and RH is set to 45 per cent, the success rate of mounting increased up to 100 per cent. A single component placement success rate with respect to RH is observed for one month. The results are shown in Table IV. It can be seen that the success rate is near 100 per cent when RH and temperature is maintained in production environment. To eliminate the ESD build-up in material and equipment in manufacturing environment humidification is a very effective way. When the RH is kept to 45 per cent, the moisture content of the air is a natural conductor and earths any ESD in environment. Originality/value Experimental data have been obtained from Laptop motherboard manufacturing process to validate the effectiveness of proposed approach.

scholarly journals The Dissimilar Self-Alignment Characteristics of Smaller Passive Components in the Length and Width Directions

2021 ◽  
Vol 34 (2) ◽  
pp. 7-15
Author(s):  
Jingxi He ◽  
Yuqiao Cen ◽  
Yuanyuan Li ◽  
Seungbae Park ◽  
Daehan Won
Keyword(s):  
Printed Circuit Boards ◽  
The Self ◽  
Solder Paste ◽  
Circuit Boards ◽  
Passive Components ◽  
Component Placement ◽  
Width Direction ◽  
Before And After ◽  
Length Direction ◽  
Solder Paste Printing

Motivation: As passive components’ size gets smaller, quality rejects due to overhang and misalignment after the reflow appear more frequently. This situation is partly because the pass-fail criterion is set based on the offset concerning the component dimensions. Therefore, understanding the self-alignment characteristics of electronic components becomes very critical for surface-mount assembly yield. This research investigates the dissimilarity of self-alignment in the length and width directions. Approach: To avoid the argument of sample to sample variations, data are collected from 81 printed circuit boards (PCB) and 182,250 assembled components. Within a PCB, 25 different solder paste printing offset locations and 81 component placement offset settings are implemented. Component-placement positions before and after the reflow are monitored. The results are compared to identify different component sizes’ self-alignment characteristics in the length and width directions. Key findings: The misalignment of smaller passive components, e.g., R0402M(0.40 mm × 0.20 mm), is worse than the larger component under the identical solder paste printing and component placement conditions. Furthermore, the self-alignment characteristic in the length direction of these passive components, e.g., R0402M, to R1005M (1.00 mm × 0.50 mm) is superior to that of width direction. The observations are not consistent with the results found in earlier research that reported on larger components, e.g., C0402M(0.40 mm × 0.20 mm), to C3216M(3.20 mm × 1.50 mm).

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