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322 Electronic Adhesives & Encapsulants JEDEC Reliability Test References Mil-Std-883, Method 1010 Specs: Temperature Cycle Test • Total Transfer Time = 10 minutes • Specified Temp reached in
Electronic Adhesives & Encapsulants High Performance / Electronic Materials Glossary of Terms ALPHA-1 & ALPHA-2 (a1 & a2): Alpha 1 is the Coefficient of Thermal Expansion (see also CTE) below the glass transition temperature (Tg). Alpha 2 is the CTE above the Tg. ALPHA EMISSIONS: Are radioactive, high energy particles that can damage semiconductor devices. Memory devices are especially sensitive to alpha emission because the passing of the alpha particle through the device can cause the memory to change its state from a 1 to a 0 or a 0 to a 1. The device does not fail, but because the memory now has the wrong value stored, it is called a soft failure. To avoid such failures, memory devices use only “low alpha” solder. Low alpha solder contains Lead which has less radioactivity than normal Lead. Because this low alpha Lead is scarce, it is more expensive. ANISOTROPIC: material that has different values when measured in different directions. Some methods of die connections use anisotropic conductors, which is a suspension of metal particles in an adhesive tape or paste. The metal conducts through the tape/ paste (vertically), but not in the plane of the tape (horizontally). The products are commonly called ACF for film and ACP for paste. The ACF or ACP is placed on the substrate and the die to be connected is flipped upside down and pushed into the paste to make the connections between the chip pads and the substrate conductors. Sometimes the pads have a gold bump on them to improve the connection. BLEEDING: Die Attach adhesives will leak out from under the die before it is cured. This leakage is called “bleed”. Since wire bonds will not stick in areas where bleed has occurred it is important that bleed not exceed a few mils. Bleeding can be controlled by formulation (filler particle size, resin/hardener selection) and process (cure temp, out time). In addition, material will bleed differently on different surfaces (Silver, Nickel, Palladium, solder mask, polyimide). CAPILLARY ACTION: The action by which the surface of a liquid in contact with the walls of a capillary tube or between two closely spaced plates is drawn into the tube or between the plates by a wicking action. An example of capillary action is in Flip Chip assembly, the underfill is dispensed next to the die and the material is pulled into the gap by the force of capillary action. CATALYST: A chemical that when added to other materials starts or speeds up a chemical reaction. The catalyst is not consumed in the reaction, it only acts to make the reaction take place. CONDUCTIVITY, ELECTRICAL: How well a material allows electricity to flow through it. The inverse of conductivity is resistivity. Most polymers do not conduct electricity, so they have very low conductivity. To make them conduct electricity we add metal particles, usually flakes of Silver. In order for the combined polymer and metal to conduct electricity, the particles must be close enough to touch. Table of Electrical Conductivity Material Resistivity (Ohm-cm) 10 E-6 Copper (Cu) 1.5 Silver (Ag) 1.5 Gold (Au) 2.0 Aluminum (Al) 2.4 Solder (60/40) 1.5 Die Attach Epoxy 100 to 400 (.0001 to .0004 ohm-cm) CONDUCTIVITY, THERMAL: How well a material allows heat to flow through it. Most metals have good thermal conductivity but ceramic and polymers have poor thermal conductivity. In order to increase the thermal conductivity of polymers, they need to be filled with a material that conducts heat well. This can be a metal (cheapest and best way) but adding a metal will also make the polymer electrically conductive. To achieve improved thermal conductivity while allowing the polymer to remain an insulator, ceramic powders such as Alumina or Aluminum Nitride are added. The unit of measure of thermal conductivity is Watt/meter-Kelvin. Table of Thermal Conductivity Material Thermal Conductivity (Watts/meter-Kelvin) Diamond (C) 600 Silver (Ag) 410 Copper (Cu) 390 Gold (Au) 300 Aluminum (Al) 240 Alumina 40 Solder (60/40) 50 Silica 4 Typical Die Attach 1.5 to 2.0 For more information please call (800) 523-2575 or visit: www.polysciences.com 323
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Chemistry Beyond the Ordinary BioSc
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Table of Contents Using this Catalo
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17. Ratio of Mw/Mn where available
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Biochemicals Buffers Histology & Mi
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BioSciences BioSciences We are plea
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Certified Dyes BioSciences Product
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Biochemicals BioSciences AITC [6241
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Biochemicals BioSciences SAR-GEL ®
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Buffers BioSciences Tris-Borate-EDT
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Histology & Microscopy Certified Dy
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Histology & Microscopy BioSciences
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Histology & Microscopy Capsule Hold
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Histology & Microscopy Bouin’s Fi
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Immunohistochemistry (IHC) BioScien
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Histology & Microscopy Coverslips M
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Histology & Microscopy Plastic Embe
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Histology & Microscopy JB-4 ® Embe
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Histology & Microscopy Poly(ethylen
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Electron Microscopy BioSciences Cat
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Electron Microscopy Grids - Slot Bi
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Electron Microscopy EM Reagents Bio
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Electron Microscopy BioSciences Thi
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Electron Microscopy BioSciences Twe
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Electrophoresis Reagents BioScience
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Fluorescent Dyes & Stains Fluoresce
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Fluorescent Dyes & Stains BioScienc
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Fluorescent Dyes & Stains BioScienc
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Microbiology BioSciences Plastic Mi
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Microbiology BioSciences Microring
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Microbiology BioSciences Urease Str
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Molecular Biology BioSciences Filip
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Molecular Biology Molecular Labelin
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Molecular Biology BioSciences New!
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Molecular Biology BioSciences Estra
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Accessories Equipment Inverted Fluo
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Accessories Gloves BioSciences Glov
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Accessories BioSciences Stirrer, po
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Accessories Tape BioSciences Silver
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Anatomic Pathology Abraxis Diagnost
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Abraxis Diagnostic Kits BioSciences
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Monomers Polymers Adjuncts Polymer
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Monomers Monomers Polysciences stoc
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Monomers Catalog Size Page Acrylic
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Monomers Catalog Size Page Amine Co
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Monomers Catalog Size Page Crosslin
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Monomers Catalog Size Page Polymeri
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Polymerizable Sites Homopolymer Tg
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Monomers Catalog Size Page Styrenic
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Polymerizable Sites Add’l. Reacti
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Monomers New! 1-(Acryloyloxy)-3-(Me
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Monomers Beta-Carboxyethyl Acrylate
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Monomers 1,4-Butanediol dimethacryl
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Monomers 3-Chlorostyrene, 98% [2039
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Monomers Diallylamine, min. 98% [12
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Monomers N-[3-(N,N-Dimethylamino)pr
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Monomers Ethylene glycol diglycidyl
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Monomers 1H,1H,2H,2H-Heptadecafluor
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Monomers N-(2-Hydroxyethyl) Carbazo
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- M - Monomers Magnesium acrylate [
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Monomers Methacryloyl fluoride [381
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Monomers New! Nile Blue Methacrylam
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Monomers 2-Phenoxyethyl methacrylat
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Monomers N-iso-Propylacrylamide [22
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Monomers Triallyl cyanurate [101-37
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Monomers Vinyl azlactone [29513-26-
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Polymers Polymers Selection Guide P
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Acrylate & Methacrylate Polymers Po
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Polymers Catalog Size Page Mol. Wei
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Polylactic Acid & Polyethylene Glyc
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Phenol-functional Polymers Polymers
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Hydroxyl Functional Polymers Polyme
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Mol. Weight Form Comments Poly(2-di
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Alphabetical Listing of Polymers -
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Polymers Dextran, DEAE ether [9015-
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Polymers Halocarbon 700 Oil [Poly(c
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Poly(diallyldimethylammonium chlori
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Polymers Poly(tert-butyl methacryla
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Polymers Poly(2-dimethylaminoethyl
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Poly(ethylene glycol) (n) diacrylat
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Polymers Poly(ethylene glycol) / Po
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Poly(ethylene/vinyl alcohol) [25067
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Polymers Poly(1-glycerol methacryla
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Poly(l-lactide/glycolide) [70:30] [
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Polymers Poly(methyl methacrylate/n
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Polymers Poly(styrene/butadiene) 85
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Polymers Poly(vinyl chloride) [9002
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Polymers Poly(N-vinylpyrrolidone/2-
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Alphabetical Listing of Adjuncts -
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Adjuncts 2-(2’-Hydroxy-5’-methy
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- M•N•O•P - Adjuncts Methyl B
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Standards Polymer Standards & Kits
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Standards Catalog Size MW ~12,000 M
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Molecular Weight Standard Kits Stan
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Organic Intermediates & Specialties
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Stable Isotope Compounds Stable Iso
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Stable Isotope Compounds Biotin-[2H
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Stable Isotope Compounds Cortisol-[
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Stable Isotope Compounds Dehydroepi
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Stable Isotope Compounds Dihydrotes
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Stable Isotope Compounds L-3,3’-D
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Stable Isotope Compounds 17b-Estrad
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Stable Isotope Compounds 6b-Hydroxy
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Stable Isotope Compounds 25-Hydroxy
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Stable Isotope Compounds 2-Methoxy-
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Stable Isotope Compounds 7-Methylxa
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Stable Isotope Compounds Pyridoxal-
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Stable Isotope Compounds Testostero
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Stable Isotope Compounds 1,3,7-Trim
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Stable Isotope Compounds Vitamin D3
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NIST Traceable Size Standards Polys
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Microspheres / Particles Microspher
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How Particles Measure Up Precision
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NIST Traceable Size Standards Micro
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Polystyrene Microspheres Polybead
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Intensity Standards Microspheres &
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Fluorescent Microspheres Microspher
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Fluorescent Microspheres Fluoresbri
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Protein Conjugated Microspheres Mic
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Microspheres & Particles Flow Cytom
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Flow Cytometry Bangs Flow Cytometry
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Page 327 and 328: Encapsulants for Fragile Substrates
Page 335: JEDEC Reference Guide IPC/JEDEC J-S
Page 339 and 340: EXTRACTABLE IONS: Ions in a materia
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Page 347 and 348: Technical Data Sheets Current list
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Page 377 and 378: CAS Number Index CAS Number Index C
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Page 385 and 386: For more information please call (8
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Australia BioScientific Pty. Ltd. 2
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