Surface Finish


         Surface finish is a process for forming a protect layer on the surface of the finished PCB, The purpose of surface finish is to meet or improve the solderability, electrical performance, corrosion resistance and wear resistance of PCB. The commonly kinds of used surface finish are as follows:

Items

Introduction

Feature

Apply

Expiry Date

ENIG

It is a type of surface plating used for printed 

circuit boards. It consists of an electroless 

nickel plating covered with a thin layer of 

immersion gold, which protects the nickel 

from oxidation.


1.Strong Conductivity

2.Well surface smoothness

3.Solderability is not well as 

other surface finish

4. low temperature processing 

technology

Mainboard,Button,VGA,

Memory stick, BGA,

Precision component


Six 

months

HASL

It is a type of surface plating used for printed 

circuit boards, the printed circuit board will 

be put into a pool which full of Tin first, so 

that it will be covered by Tin, and then 

through the hot air cutter to make the Tin 

solidify. And then it will form a Tin layer on 

the solder pads, the Tin on the solder mask 

will be cleared 

1.Strong solderability

2.Poor surface smoothness

3.High temperature processing 

technology 

Switch,LED,Driver

Consumer electronics

Twelve 

months

OSP

It is a type of surface plating used for printed 

circuit boards. Form an organic film on a clean 

bare copper surface by chemical reaction.

1.Strong solderability

2.Strong heat resistance

3.Strong moisture resistance

4.Well surface smoothness

5.low temperature processing 

technology

Switch,LED,Driver

Consumer electronics


Twelve 

months


Hard 

Gold

It is a type of surface plating used for printed 

circuit boards. Form a thin layer of nickel is 

plated on the copper foil via chemical 

electrolysis, and a layer of gold is electroplated 

on the basis of nickel. The chemically 

electrolyzed nickel gold are denser than the 

chemical immersion gold , so the corrosion 

resistance/wear resistance is stronger.

1.Strong Conductivity

2.Well surface smoothness

3.Solderability is not well as 

other surface finish

4. low temperature processing 

technology

Gold finger,

Memory stick,VGA

Six

months



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