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16 Layer Immersion Gold HDI PCB for Electronic Product
♦ What is Immersion Gold?
Immersion Gold (also known as ENIG – Electroless Nickel Immersion Gold) is a surface finish applied to printed circuit boards (PCBs) to protect exposed copper pads and ensure reliable solder connections. It consists of two layers:
♦ Key Characteristics of Immersion Gold (ENIG):
✔ Flat Surface – Ideal for fine-pitch components (e.g., BGAs, QFNs).
✔ Excellent Solderability – Ensures strong, reliable solder joints.
✔ Long Shelf Life – Resists oxidation better than bare copper or OSP.
✔ Wire-Bondable – Suitable for gold or aluminum wire bonding (used in IC packaging).
✔ Lead-Free & RoHS Compliant – Environmentally friendly compared to HASL (lead-based).
♦ Comparison with Other PCB Finishes?
Finish | Thickness | Flatness | Solderability | Cost | Best For |
---|---|---|---|---|---|
ENIG (Immersion Gold) | Thin Au (0.05–0.1µm) | Very Flat | Excellent | Moderate | High-reliability, fine-pitch |
HASL (Hot Air Solder Leveling) | Thick Sn/Pb or Sn | Uneven | Good | Low | General-purpose PCBs |
OSP (Organic Solderability Preservative) | Organic coating | Flat | Good (but degrades over time) | Low | Short-life consumer electronics |
Electrolytic Hard Gold | Thick Au (0.5–1.5µm) | Flat | Good (but requires nickel underlayer) | High | Connectors, wear-resistant parts |
♦ Technical Parameters
Item |
Spec |
Layers |
1~64 |
Board Thickness |
0.1mm-10 mm |
Material |
FR-4, CEM-1/CEM-3, PI, High Tg, Rogers, PTEF, Alu/Cu Base,Ceramic, etc |
Max Panel Size |
800mm×1200mm |
Min Hole Size |
0.075mm |
Min Line Width/Space |
Standard: 3mil(0.075mm) Advance: 2mil |
Board Outline Tolerance |
士0.10mm |
Insulation Layer Thickness |
0.075mm--5.00mm |
Out Layer Copper Thickness |
18um--350um |
Drilling Hole (Mechanical) |
17um--175um |
Finish Hole (Mechanical) |
17um--175um |
Diameter Tolerance (Mechanical) |
0.05mm |
Registration (Mechanical) |
0.075mm |
Aspect Ratio |
17:01 |
Solder Mask Type |
LPI |
SMT Min. Solder Mask Width |
0.075mm |
Min. Solder Mask Clearance |
0.05mm |
Plug Hole Diameter |
0.25mm--0.60mm |