Surface Finish Resource
PCB surface finish comparison for assembly reliability.
Surface finish protects copper pads and affects solderability, pad flatness, storage behavior and assembly process selection.
| Finish | Engineering fit | Typical use |
|---|---|---|
| HASL | General solderable surface | Standard industrial PCB |
| Lead Free HASL | Lead-free assembly needs | General electronics |
| ENIG | Flat pads and fine pitch assembly | HDI, BGA and dense boards |
| OSP | Organic surface protection | Selected assembly workflows |
| Immersion Silver | Flat metallic finish | Project-specific review |
Manufacturing considerations
Finish selection should be based on component pitch, assembly process, storage expectations, customer standard and inspection requirements.
Internal links
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