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ETAG Co. Products : UL Online Certifications Directory

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PART2:PCB PROCESS

WHAT IS PCB ?

PCB is the abbreviation for Printed Circuit Board, it is a place to mount the components and it provides the means of electrical connection between the components.

WHAT IS SOLDER MASK ? WHAT COLOR ARE IN THE WORLD FOR SOLDER MASK / WHICH STEP IN PRODUCTION IS FOR SOLDER MASK? WHY WE USE SOLDER MASK ALSO THIS QUESTION FOR SILK SCREEN

Solder mask or solder resist is a lacquer-like layer of polymer that provides a permanent protective coating for the copper traces of a printed circuit board (PCB) and prevents solder from bridging between conductors, thereby preventing short circuits.

We have many different colors for solder mask, mainly are Green, Black, White, Red, Blue and Yellow.

After developing circuits image on the FR-4, then go to the solder mask process.

Solder mask is coat layer to protect the copper traces on PCB, silkscreen

WHAT IS DIFERENT WAY FOR SILKSCREEN PROCESS IN DIFERENT FACTORY

We have hand printing and auto printing two different ways for printing silkscreen.

What are STANDARDS IN the selection of board thickness?

For board thickness, we have thickness from 0.20mm-3.0mm or even thicker.

how can change mm to ml and inch ?

1 inch=1000 mil
1 inch=25.4 mm
1 mil=25.4 um=0.0254 mm

what is pads finished ?

PADs is a broad range of industrial processes that alter the surface of a manufactured item to achieve a certain property on the PCB.

what pads finished to now are there in the world and what is diferent between them for example ? imersion gold . hard gold and softgold and diferent between them also other pads finishes what is standard for selection them in a pcb process?

PADs finishing: HASL, Lead Free HASL, OSP, Immersion Gold, Flash Gold, Immersion Silver, Immersion Tin, Gold Finger….

When select a finishing, we should take below into consideration: where PCB would be used, the production cost

what is finger gold? in which step factory make gold finger ? are there diferent thickness for that?

When the PCB has connected section, then would design it as Gold Finger.

Gold Finger thickness is different according to customer's request. But the thicker one would more expensive in production cost.

how many etest way there are? what is diferent between them ?

We have two different way for E-Test, Flying Probe Test and Fixture test. Both are checking whether the boards has open / short circuit or not.

Flying probe test is testing the boards point by point, it is more slowly hence mainly for sample and prototype orders.

Fixture test with a stable fixture for testing, it is much quicker and mainly used for mass qty orders.

how many raw material are there for pcb making ?/ what is diferent between them for a pcb designer ?

We have FR-4, FR-1, FR-2, Metal base like Aluminum….

FR-1 and FR-2 is mainly used for single layer PCB and for simple products. It is also cheap in price.

FR-4 is most common material for a PCB.

Metal base PCB is for boards need stay under high temperature.

how many certificates are there for pcbs ? what is UL and IPC what is diferent between diferent IPC why diferent factory use diferent IPC?

  • For PCBs, it has certificates like, UL, IPC, ISO, TS….
  • Underwriters Laboratories Inc. (UL) is an independent product safety certification organization. UL develops standards and test procedures for products, materials, components, assemblies, tools and equipment, chiefly dealing with product safety.
  • IPC

what is flexiboards ?

Flex PCB is constructed from flexible, high-performance plastic material, usually polyimide, which enables the board to bend or "flex" during use.

what is aluminum base pcbs?

Aluminum PCB is use aluminum base material for the main base of the PCB.

how many cuting are ther for pcb pcs in a panel ? for example v cut and vscoring?? when we use extra rail ? what is funductial in a extra rail

We have CNC Routing, V-Cut, and Punching for cuting PCB into pcs in a panel.
When we panel some single pcs into a panel, we will need extra rail to structure the panel well.
Fiducial Marks provide common measurable points for all steps in the assembly process. This allows all automated assembly equipment to accurately locate the circuit pattern 

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