What is HASL
HASL covers exposed copper with solder and then levels the surface with hot air. Lead Free HASL is commonly selected for RoHS-oriented projects. It is widely used for many standard FR4 PCB applications.
PCB Surface Finish
ENIG vs HASL PCB Surface Finish Comparison
ENIG and HASL are common PCB surface finish options. The right choice depends on assembly method, component pitch, storage expectations and reliability requirements.
What is HASL
HASL covers exposed copper with solder and then levels the surface with hot air. Lead Free HASL is commonly selected for RoHS-oriented projects. It is widely used for many standard FR4 PCB applications.
What is ENIG
ENIG adds electroless nickel and immersion gold to provide a flat, solderable surface. It is often selected for fine pitch components, BGA assembly, test pads and applications that require better pad planarity.
Solderability and assembly
HASL can be suitable for many conventional assemblies, while ENIG provides a flatter pad surface for dense and fine-pitch designs. Assembly requirements should be reviewed before selecting a finish.
Applications
HASL is common for standard industrial boards and general electronics. ENIG is often used for HDI PCB, multilayer PCB, BGA designs, medical electronics and higher density assemblies.
Selection considerations
Designers should consider component pitch, storage time, surface flatness, compliance requirements and final use environment when comparing finish options.
Engineering review first
YBCPCB reviews PCB files, material requirements, stackup notes and inspection needs before production planning.
What is ENIG
ENIG adds electroless nickel and immersion gold to provide a flat, solderable surface. It is often selected for fine pitch components, BGA assembly, test pads and applications that require better pad planarity.
Solderability and assembly
HASL can be suitable for many conventional assemblies, while ENIG provides a flatter pad surface for dense and fine-pitch designs. Assembly requirements should be reviewed before selecting a finish.
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