SnPbTin-Lead (Solder)
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SnPbSyndicat National du Pompage du Béton (French: National Union of Concrete Pumping)
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References in periodicals archive ?
Copper only (OSP) 22.5% 23.0% HASL 55.3% 40.6% Lead-free HASL 23.0% 37.3% SnPb plate and reflow 18.9% 12.3% Im.
There was considerable debate and distress over what alloy would replace dependable SnPb. Considerations included reliability, process compatibility and cost.
For example, there are cases in which a project specification calls for SnPb or eutectic solder paste, but the assembler receives BGA components with Pb-free solder balls.
"For companies that manufacture products that must have high-reliability and long-service-life, the rationale for staying with SnPb assembly is very clear--the reliability of Pb-free assembly has not been sufficiently demonstrated for long-life, mission-critical applications," said Ken Stuchlik, SCN processor and I/O technical manager for Lucent Technologies, and co-chair of iNEMI's SnPb BGA Availability Task Group.
THROUGH-HOLE AND SURFACE mount electrolytic capacitors can pop or blowout during operation or soldering in a SnPb or Pb-free process.
Eutectic SnPb or SAC 305 solder preforms were placed between two ENIG coated 1.25" x 0.375" x 0.008" copper-oxidized and non-oxidized substrates and reflowed in air (FIGURE 1).
Compared with SnPb systems, Pb-free joints are characterized by larger and a higher amount of voids.
SnPb alloys are usually run at temperatures of 250[degrees] to 260[degrees]C, whereas SnCuCo alloys are processed at temperatures in the range of 260[degrees] to 270[degrees]C and SAC305 at 255[degrees] to 265[degrees]C in HAL, wave and SMT soldering equipment.
This can occur, for instance, when raw materials for fabrication are optimized for SnPb technology, yet the PCB is assembled using Pb-free technology.
High-speed connectors often have finished PTH nominal diameters ranging from 0.46 to 0.60mm and, in accordance with RoHS, will have PTH finishes other than SnPb. These finishes may include immersion tin or electroless NiAu and require PTH tolerances often more stringent than those associated with SnPb finishes.