PCB surface finished

[viperpaki007]

Hi,

What kind of PCB surface finish types are normally used. What are there pros and cons. Which is recommended one for high frequency PCB.

regards

 

[rube]

HASL,ENIG,ENEPIG,Immersion Silver,Immersion Tin,Flash Gold,Golden Finger,OSP,Lead free HASL etc. Surface treatment only affects the reliability and cost, normally ENIG is ok.

 

[marce]

ENIG is probably the most common today.

 

[sapphire_2010]

beside reliability, surface finish requirements depends on how frequently you need to plug in /plug out board & components... Certain areas require thick plating. For edge finger (Hard gold) 50uin Au over 200uin Ni is recommended. If you use any smt socket (for your chip/ic) or any smt plug in component, it is recommended to have same surface finish. ENIG is only ~5uin of Au with 150uin of Ni.

 

[marce]

We are talking surface finish, hard gold for connectors is a different subject and has no bearing on ENIG, if you solder a socket to the board the solder pad would have an ENIG finish, why confuse the situation!

 

[kozacy]

HASL(lead free) the lowest cost pcb's surface treatment.
ENIG excellent solderability , coplanar-flat surface,excellent shelf-life,withstands multiple reflows. Higer price.
In your case ENIG (Au 2u" Ni 150u" ) is OK.