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PCB Final Finishes

Here you will find information on the leading surface finishes available for your bare printed circuit board.


l Finish Characteristics Comparison Chart

FINAL FINISH   
                 
 
PANEL COST  

  
FLATNESS    
 
 
SHELF LIFE   

   
  HANDLING   
 
 
AVAIL (N.A.)

ENEPIG $50+ Flat 1yr
Resistive Sourced
ENIG $20 Flat 1yr
Resistive High
HASL Base Rough
1yr
Resistive High
Pb-free HASL $2 Rough 1yr Resistive High
OSP $5 Flat 6mo Fragile Sourced
ImAg $5 Flat 1yr Fragile High
ImAu
$5 Flat 1yr Fragile High
ImSn          
$5 Flat 6mo Fragile Medium
Deep Gold          
Area Flat 1yr Resistive Sourced


 pcb-final-finishes



Circuit Board Surfaces Analysis

The Final Finishes Resource Center addresses concerns throughout the PCB supply chain by providing technical research and information pertaining primarily to:

  • Fabrication
  • Design
  • Assembly



Criteria for Selecting a Final Finish 

According to Mike Carano (from his IPC Blog) selecting a PCB final finish is vital to the end product; therefore, there is much more to consider than merely aesthetics and cost. With so many final finish options available, how do the PCB fabricator, designer and assembler reconcile the best option to insure long term solder joint reliability under lead-free soldering conditions? What finish or finishes are best suited for fine pitch BGA as well as through-hole assembly?
Click here to read more



9 things to consider when selecting a final finish

  1. What is the ultimate reliability requirement for the PCB? Atmosphere, environment, etc.
  2. How many assembly cycles will the board (and surface finish) be subjected to?
  3. Is ICT important for the finish?
  4. Are cosmetics a key attribute?
  5. Does the PCB eventually require wirebonding?
  6. Product life of the circuit board?
  7. Equipment considerations for final finish processing
  8. Is shock / drop testing a concern?
  9. Overall cost of the finish in comparison with the total board cost and required functionality

Click here for more information on Final Finishes