PCB Surface

PCB surface finish include: PCB surface finish is a coating between a component
and a bare board PCB. It is applied for two basic reasons: to ensure
solderability, and to protect exposed copper circuitry. As there are many types
of surface finishes, selecting the right one is no easy task, especially as
surface mounts have become more complex and regulations such as RoHS and WEEE
have changed industry standards.

Recently, the common surface pcb treatment technologies which GreensTone may
use when manufacturing PCBs are HASL(hot air solder leveling), organic coating
(OSP), electroless nickel/gold, immersion silver, immersion gold, etc.

The solder mask is mainly Liquid UV Photo-imageable Ink with green, red, black,
yellow, white, matt black/green, bule, gray, etc. green should be the most
commonly used one. The suggested soldermask clearance in GERBER is 2-4 mils.

The silkscreen layer is the top layer of the printed circuit board and serves
as a reference indicator for placing components on the PCB. The graphics and
text on PCB, a circuit board is usually printed with a permanent non-conductive
epoxy ink. The color is typically white. Screen printing is used to specify
useful information on the PCB board, which can help users during the assembly.
It is used to mark component values, part numbers, test points, polarity, etc.

PCB Surface Features
PCB finish comparison of cost and solderability
Actual solderability: Electroplating nickel gold> HASL > OSP > ENIG >Immersion
silver >Immersion tin

Cost: Electroplating nickel gold > ENIG > Immersion silver> Immersion tin >
HASL > OSP.

The functions of the solder mask layer on the PCB board
Preventing short circuit from bridge connection in the soldering process

Preventing the physical breakage of a conductor circuit

Prevent short circuit between conductive lines and solder joints when
proceeding reflow soldering, wave soldering, and manual welding

Preventing the copper layer from oxidation

Its high Insulating brings the possibility to the high density of PCB boards

Here are three main ways to add silkscreen coating on a PCB
Manual screen-printing: This is a process that can be used when line widths are
greater than 7 mm and the registration tolerance is 5 mm.

Liquid Photo Imaging (LPI): This process provides more accuracy and legibility
over manual screening and is used when line widths are greater than 4 mm

Direct Legend Printing (DLP): This is the most accurate way of adding a
silkscreen, however, it is very expensive.

PCB Surface Manufacturing Introduction
HASL (hot air solder leveling)/HASL lead Free HASL/HASL lead free is the
process of coating tin-lead/ tin-lead free solder on the surface of PCB so that
it forms a layer of both anti-copper oxidation and good weld ability of the
coating.

Organic Coating (OSP) OSP is a chemical process to build a layer of organic
skin film on the clean bare copper surface, it helps anti-oxidation,and
moisture resistance, to protect the copper surface from vulcanization or
oxidation, etc. In simply words,OSP acts as a barrier between copper and air.

ENIG (Electroless Nickel/Immersion Gold) ENIG is a thick nickel gold
alloy with good electrical properties on the copper surface,acts as a rust
barrier to protect PCB for a long time, which can be useful and achieve
excellent electrical performance in the long term use of PCB.

Immersion Silver Silver impregnation does not put heavy coat on PCB,
which provides good electrical properties and maintains good solder ability
when exposed to humidity ,heat,and pollution,

Immersion Tin With adding organic additives to the tin layer, the tin layer
structure is granular, which overcomes the tin whisker problems and has
excellent thermal stability and solder ability.

As one of contract electronics manufacturing companies, we will do our best to
meet all the needs of customers.

Click to Enlarge