鸥翼引线的优化设计

[1991 Proceedings] Eleventh IEEE/CHMT International Electronics Manufacturing Technology Symposium Pub Date : 1991-09-16 DOI:10.1109/IEMT.1991.279754

W. Chen, G. Dody, W. Adamjee

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引用次数: 0

摘要

只提供摘要形式。在-40℃~ 125℃的温度循环环境下，研究了细间距海鸥翼引线的长期可靠性。试验车辆为208导联的细间距四平面封装(FQFP)塑料封装，引线间距为0.5 mm。引线在以下配置中特别准备:两种不同的脚长，0.5 mm和0.8 mm;两种不同的脚角，2度和14度;两种不同的下弯半径，14密尔和21密尔;两种不同的焊料成分，63/37 Sn/Pb和62/36/2 Sn/Pb/Ag;所有引线的共平面度为1.4密耳或以下;8个角引线变形共面度在1.5 ~ 2.9 mils范围内;8个角引线变形的共平面度在3.0 ~ 4.4 mils之间。本研究采用L8正交阵列的田口实验设计

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Optimization of the gull wing lead

Summary form only given. The long-term reliability of fine-pitch gull wing leads was investigated in a temperature cycling environment of -40 degrees C to 125 degrees C. The test vehicle was a 208-lead fine pitch quad flat pack (FQFP) plastic package, with lead pitch of 0.5 mm. The leads were specially prepared in the following configuration: two different foot lengths, 0.5 mm and 0.8 mm; two different foot angles, 2 degrees and 14 degrees ; two different lower bend radii, 14 mils and 21 mils; two different solder compositions, 63/37 Sn/Pb and 62/36/2 Sn/Pb/Ag; coplanarity for all leads of 1.4 mils or less; coplanarity of all eight corner leads deformed in the range of 1.5 to 2.9 mils; and coplanarity of all eight corner leads deformed in the range of 3.0 to 4.4 mils. A Taguchi experiment design with an L8 orthogonal array was employed in this investigation.<>

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[1991 Proceedings] Eleventh IEEE/CHMT International Electronics Manufacturing Technology Symposium

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