is fine for larger parts, but for small components, it's archaic and not reliable.
These coatings are the most susceptible to corrosion failures and are expected to be much more susceptible than traditional HASL
A visual assessment of the bare boards showed evidence of solder mask overlap into the pad areas, exposed copper under the HASL
surface finish, and non-uniform HASL
finish in certain cases.
As for shelf life, HASL
has about 18 months, but OSP has only six months.
Predicting the winning replacement for HASL
has been a difficult task.
37 [+ o -] 1[grados]C HASL
Escala de laboratorio, >12 60 0,250 6 sistema hibrido de dos fases solida y liquida, un reactor con residuos solidos (frutas, vegetales, cascara de huevo, tallarines) con inoculo de 46% de lodo, para acidificacion conectado a un reactor metanogenico (RANMAL).
The addition of Lead Free HASL
adds to our current RoHS compliant surface finishes which include Immersion Silver, Immersion Tin, Electroless Nickel/Immersion Gold, Deep Tank Gold and OSP," stated Brian Barber, VP of Operations and Supply Chain Management for Viasystems.
Lead-free hot air leveling will supplant HASL
during the next 18 months, again thanks to implementation of lead-free designs (TABLE 7).
The new HASL
unit will be used to manufacture lead-free products and also add redundancy to current production processes.
Different PCB surface finishes, such as Cu-OSP, ENIG, ENEPIG, and HASL
(commonly used in the microelectronic industry) and some recently developed surface finishes, ENTEK-OM and Pallaguard, were evaluated in ATC testing of SAC 305 Pb-free LGAs and BGAs.
Carter showed PCD&F the electrical test results performed by Sanmina on the 12-layer HASL
has a shelf life of about 18 months; OSP only six months.