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ALPHA® SnBiAg LOW TEMP SOLID SOLDER WIRE
ALPHA® Sn42 Bi57.6 Ag0.4 is a lead-free solid solder wire primarily used for rework operations and touch up soldering of low temperature based electronic assemblies. This low temp solution also delivers the following benefits:• Enables soldering processes with sensitive
components or connectors.• Reduces energy consumption in soldering process
versus standard lead-free alloys.• Compatible with all commonly used lead-free
surface finishes.• Low temperature soldering process may enable
the use of less expensive printed circuit board materials, when appropriate.
Application• There is no ideal tip temperature, since that will
depend on what you are soldering and how thermally demanding the assembly is. In general, tip temperatures between 200°C and 300°C would be appropriate.
• For fluxing, ALPHA® CVP-520 Flux Gel is available in 10g syringes, 30g syringes and 125g jars for use with ALPHA Sn42 Bi57.6 Ag0.4 Solid Solder Wire.
• All components used with ALPHA® Sn42Bi57.6Ag0.4 Solid Solder Wire must be lead-free to eliminate the formation of tin/lead/bismuth intermetallic which has a melting point under 100°C.
Key Attributes• Alloy provided in solid wire form for convenient use.• Available in various wire diameters that are suitable
for electronics assembly processes (min: 0.6mm).• More versatile than SnBiAg alloy Solid Solder Sticks.• Enables rework of low temperature alloy solder
joints while maintaining the original alloy composition.
• Avoids the need for additional reliability testing of solder joints reworked with an alternative alloy.
REDUCEDMATERIAL
COST
LONG-TERM RELIABILITY
REDUCEDENERGY
COST
SPEEDLIMIT
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AlphaAssembly.com
LOW TEMP ALLOYS ENABLE:
Use of Low Tg PCBs Reduced exposure to thermal excursion Elimination of wave soldering process
Use of low temp compatible components Elimination of wave soldering process
Reduced waste and scrap
For more information about ALPHA® SnBiAg Low Temp Solid Solder Wire, please contact your Alpha Representative.
ALPHA® SnBiAg LOW TEMP SOLID SOLDER WIRE
©2017 Alpha Assembly Solutions Issued 10/17 SM1465
REDUCEDMATERIAL
COST
LONG-TERM RELIABILITY
REDUCEDENERGY
COST
SPEEDLIMIT
TECHNICAL SPECIFICATIONS
MATERIAL PROPERTIES Sn42Bi57.6Ag0.4
Melting Point 137.1 ºC
Coefficient of Thermal Expansion 17.1 ppm/°C
Thermal Conductivity (W/mK) 24.5
Tensile Strength (as cast) 67 MPa
ALLOY COMPARISON
ALLOYS UTS (MPa) ELONGATION (%) E (GPa)
Sn42Bi58 63.6 48.2 39.0
Sn42Bi57.6Ag0.4 67.4 52.6 39.3
The addition of a small amount of Ag helps to improve the SnBi alloy mechanical properties.