2007-11-17 13:38:00 |
| 电子元器件封装形式 |
CDIP-----Ceramic Dual In-Line Package
CLCC-----Ceramic Leaded Chip Carrier
CQFP-----Ceramic Quad Flat Pack
DIP-----Dual In-Line Package
LQFP-----Low-Profile Quad Flat Pack
MAPBGA------Mold Array Process Ball Grid Array
PBGA-----Plastic Ball Grid Array
PLCC-----Plastic Leaded Chip Carrier
PQFP-----Plastic Quad Flat Pack
QFP-----Quad Flat Pack
SDIP-----Shrink Dual In-Line Package
SOIC-----Small Outline Integrated Package
SSOP-----Shrink Small Outline Package
DIP-----Dual In-Line Package-----双列直插式封装。插装型封装之一，引脚从封装两侧引出，封装材料有塑料和陶瓷两种。DIP是最普及的插装型封装，应用范围包括标准逻辑IC，存贮器LSI，微机电路等。
PLCC-----Plastic Leaded Chip Carrier-----PLCC封装方式，外形呈正方形，32脚封装，四周都有管脚，外形尺寸比DIP封装小得多。PLCC封装适合用SMT表面安装技术在PCB上安装布线，具有外形尺寸小、可靠性高的优点。
PQFP-----Plastic Quad Flat Package-----PQFP封装的芯片引脚之间距离很小，管脚很细，一般大规模或超大规模集成电路采用这种封装形式，其引脚数一般都在100以上。
SOP-----Small Outline Package------1968～1969年菲为浦公司就开发出小外形封装（SOP）。以后逐渐派生出SOJ（J型引脚小外形封装）、TSOP（薄小外形封装）、VSOP（甚小外形封装）、SSOP（缩小型SOP）、TSSOP（薄的缩小型SOP）及SOT（小外形晶体管）、SOIC（小外形集成电路）等。
常见的封装材料有：塑料、陶瓷、玻璃、金属等，现在基本采用塑料封装。
按封装形式分：普通双列直插式，普通单列直插式，小型双列扁平，小型四列扁平，圆形金属，体积较大的厚膜电路等。
按封装体积大小排列分：最大为厚膜电路，其次分别为双列直插式，单列直插式，金属封装、双列扁平、四列扁平为最小。
两引脚之间的间距分：普通标准型塑料封装，双列、单列直插式一般多为2.54±0.25 mm，其次有2mm（多见于单列直插式）、1.778±0.25mm（多见于缩型双列直插式）、1.5±0.25mm，或1.27±0.25mm(多见于单列附散热片或单列V型)、1.27±0.25mm(多见于双列扁平封装)、1±0.15mm(多见于双列或四列扁平封装)、0.8±0.05～0.15mm(多见于四列扁平封装)、0.65±0.03mm(多见于四列扁平封装)。
双列直插式两列引脚之间的宽度分：一般有7.4～7.62mm、10.16mm、12.7mm、15.24mm等数种。
双列扁平封装两列之间的宽度分（包括引线长度：一般有6～6.5±mm、7.6mm、10.5～10.65mm等。
四列扁平封装40引脚以上的长×宽一般有：10×10mm(不计引线长度)、13.6×13.6±0.4mm(包括引线长度)、20.6×20.6±0.4mm(包括引线长度)、8.45×8.45±0.5mm(不计引线长度)、14×14±0.15mm（不计引线长度）等。 |
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2008-8-15 17:07:00 |
| 非常同意你的看法 |
The science of love OVER the course of history it has been artists, poets and playwrights who have made the greatest progress in humanity's understanding of love. Romance has seemed as inexplicable as the beauty of a rainbow. But these days scientists are challenging that notion, and they have rather a lot to say about how and why people love each other.Scientists are finding that, after all, love really is down to a Warhammer Online Power Leveling chemical addiction between people IF IT were a country, California would be one with more people than Canada and an economy the size of China's. Its scientists shoot, with their rockets, for the moon; its films spread Hollywood's culture around the globe; its athletes break world records; even its wines now rank with the best of France's.Ifyouwow power leveling look aroundwow power leveling at thewow power leveling men andwow power leveling women whom you can call happy, you will see that they all have certain things in common. The most important of these things iswow power leveling wow powerleveling wow powerleveling an activity which at most gradually buildswow powerleveling up something wow powerleveling that you are glad to see wow powerleveling world of warcraft power leveling world of warcraft power levelingcoming into existence. Womenworld of warcraft power leveling who take anworld of warcraft power leveling world of warcraft power leveling instinctive pleasure in their children world of warcraft powerleveling world of warcraft powerlevelingcan get this kind of satisfaction out of bringing up a family. world of warcraft powerleveling world of warcraft powerleveling Artists and authors and men of scienceworld of warcraft powerleveling wow gold wow gold get happiness in this way if their own workwow gold wow gold seems good to them. But therewow gold world of warcraft gold world of warcraft gold are many humbler forms of the same kindworld of warcraft gold world of warcraft gold world of warcraft gold of pleasure. Many men who spend their working life in the city devote their weekends to voluntary and unremuneratedAOC Power Leveling AGE OF CONAN Power Leveling toil in their gardens, and when the spring comes, they experience all the joys of having created beauty. A mother holds a cherished, inexplicable bond with her child. The path of motherhood is not an easy one and the women that walk this path should be applauded.As you all know, Mother's Day is just around the corner. For those of you who forgot, this is the day to honor the woman that brought you into this world. Don't make the same mistake that I did for so many years and buy her appliances to Warhammer Online Gold last her a lifetime of cooking and cleaning.This year, give the mom in your life a gift that show you care and love her with all your heart. Here are 10 of those potentially awesome gifts LWB-3 g7v6g7xv |
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2008-4-9 21:53:00 |
| Re:电子元器件封装形式 |
电子进修
http://www.studydz.com |
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2008-3-13 20:57:00 |
| Re:电子元器件封装形式 |
电子制作,电子应用,电路图,电路元器件,电路基础,单片机,嵌入式教程http://www.electronlab.cn |
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2007-11-23 10:58:00 |
| 很好！ 你很容易便可以吸引异性。但是你并不容易陷入爱情的陷阱。你的幽默感使得人们乐於与你相处，他(她)与你一起时非常快乐! |
很好！ 你很容易便可以吸引异性。但是你并不容易陷入爱情的陷阱。你的幽默感使得人们乐於与你相处，他(她)与你一起时非常快乐!
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