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Visitor
Posts: 18
Registered: ‎11-23-2017

disadvantages of Pb-free

Hi,

 

Pb-free is an option for some packages. What are the advantages and disadvantages of it?

 

Regards

Moderator
Posts: 8,870
Registered: ‎02-27-2008

Re: disadvantages of Pb-free

The advantage is that it meets ROHS (reduction of hazardous substances) laws, and import restrictions,

 

The disadvantage is that in some industry segments, the new materials are considered unreliable due to their limited data on failure mechanisms for the varied alloys being used.  Lead has been used since the Romans, so it is pretty well known in its behavior when combined with tin to make eutectic solders.

 

Using lead containing components may require waivers, or be prohibited, depending on what country, intended use, import or export laws.

 

For reliability information on our packages, please contact your local sales office.

Austin Lesea
Principal Engineer
Xilinx San Jose
Visitor
Posts: 18
Registered: ‎11-23-2017

Re: disadvantages of Pb-free

Thanks @austin

 

Could you please explain the disadvantage more?

Moderator
Posts: 8,870
Registered: ‎02-27-2008

Re: disadvantages of Pb-free

For details on package reliability, please contact your local sales office,

 

Generally speaking, reliability is publicly covered in ug116.  Details are dealt with through direct contact, often with a non disclosure agreement (NDA) in place.

Austin Lesea
Principal Engineer
Xilinx San Jose
Highlighted
Scholar
Posts: 1,189
Registered: ‎11-09-2013

Re: disadvantages of Pb-free

There is one big disadvantage of RoHS that can be said out loud without NDA - rohs solder smells really bad.

 

Besides the bad smell rohs solder requires all components to withstand higher temperatures, as example some plastic connectors can melt because of RoHS soldering.

 

It is way harder to de-solder components with RoHS, and any manual soldering or PCB rework with RoHS solder is way more complicated.