Understanding ENEPIG in PCB – A Complete Guide

ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold) is a crucial PCB surface finish offering superior reliability, wire bondability, and shelf life. This finish is widely used in aerospace, medical, and high-frequency PCBs.

What is ENEPIG?

ENEPIG consists of three layers:

• Electroless Nickel (Ni): Acts as a strong barrier layer.

• Electroless Palladium (Pd): Prevents nickel corrosion and oxidation.

• Immersion Gold (Au): Enhances solderability and protects against environmental damage.

Advantages of ENEPIG

ENEPIG is beneficial due to:

• Wire bondability for both gold and aluminum.

• Strong corrosion resistance and oxidation prevention.

• Extended shelf life and lead-free solder compatibility.

Applications of ENEPIG

ENEPIG is widely applied in:

• Automotive electronics.

• High-speed and RF PCBs.

• Aerospace and medical devices.

With its numerous advantages, ENEPIG has become the preferred choice for high-reliability applications.