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Lead-Free qualification process

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#36203

Lead-Free qualification process | 22 August, 2005

Hi,

Need some assitance from people that have experience with qualification for Lead-Free SMT process. We are in a phase to qualify Lead-Free process to one of our new product. The BOM - build of material is complete but we missing some passive components that is not yet been lead-free and the manufacture can not give us any date where the lead-free component are availible. We got a discussion with our EMS supplier but they are affraid to qualify this mix component process due to lead contermination on the Lead-free PCB. Do anybody have been through this or have reference to reports where similar project have been qualified. We are going to review all the passive leaded component specification to make sure they can handle the temperature used in Lead-Free process.

Rgds JaVi

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Rob

#36212

Lead-Free qualification process | 22 August, 2005

Hi JaVi,

What are the part no.s & manufacturers?

Cheers,

Rob.

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javi

#36218

Lead-Free qualification process | 22 August, 2005

The list is not yet completed but I picked few different component that our supplier are not able to get in Lead-Free or problem to get leadtime: Mfg Part : Zener Diodes BZG03 - MFG : Phillips Mfg Part : PME271Y447M - MFG: Evox-Rifa Mfg Part : LMC6062AIM - MFG: NATIONAL SEMICONDUCTOR Mfg Part : IRF7240 - MFG: INTERNATIONAL RECTIFIER Mfg Part : IRF1104 - MFG: INTERNATIONAL RECTIFIER Mfg Part : 40CQP035 - MFG : INTERNATIONAL RECTIFIER

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Rob

#36223

Lead-Free qualification process | 22 August, 2005

> The list is not yet completed but I picked few
> different component that our supplier are not
> able to get in Lead-Free or problem to get
> leadtime: Mfg Part : Zener Diodes BZG03 - MFG :
> Phillips Mfg Part : PME271Y447M - MFG:
> Evox-Rifa Mfg Part : LMC6062AIM - MFG: NATIONAL
> SEMICONDUCTOR Mfg Part : IRF7240 - MFG:
> INTERNATIONAL RECTIFIER Mfg Part : IRF1104 -
> MFG: INTERNATIONAL RECTIFIER Mfg Part :
> 40CQP035 - MFG : INTERNATIONAL RECTIFIER

Hi JaVi,

BZG03 from Vishay (www.vishay.com) is leadfree PME271Y447M is just a 4N7 Y2 cap, depending on where you're based in the world you can have Epcos (B81122C1472M), Arcotronic, Vishay (BC Comp) etc.

Regarding the semi's I'd ask your design engineers to find leadfree alternatives as they know the exact properties that they are looking for in an alternative device.

Rob.

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javi

#36245

Lead-Free qualification process | 23 August, 2005

Rob,

Thanks for your feedback, the engineering and purchaser is working to get alternative component. But seems like we have start manufacture few prototype without the lead-free due to the LLT. Do you have experience with this production regards to possible lead contermination ? or are there other concern ?

Rgds JaVi

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Ken

#36271

Lead-Free qualification process | 23 August, 2005

Basic rule of thumb for lead free manufacturing:

If the joint looks "too good" it probably has lead in it. This, of course is based on comparison observations of other components on your assembly.

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#36284

Lead-Free qualification process | 24 August, 2005

Ken you're so right it scares me. If it looks too good its "reject" can't wait to see the definition in the lead-free workmanship standards.

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javi

#36286

Lead-Free qualification process | 24 August, 2005

Patric,

The product is exempted from the RoHS regulativ 1'st phase(2010) and our policy is to follow the new EU regulations as this will also push the Industri technolegy and the SMT process. Our concern is more that we are not able to qualify the process of product early enough as we do not get all component 100% lead-free. We are afraid that this migth force us to run another qualification with all components designed for lead-free process that is today NOT qualified as "backward compatible".

Our biggest consern is; Are we really able to complete the qualification with mixed components in a lead-free SMT process ? Is there other consern than the lead contermination and possible temp specification for the leaded component ?

Rgds JaVi

Rgds JaVi

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#36291

Lead-Free qualification process | 24 August, 2005

Javi,

The reason you have an exemption for your product is because there are reliability concerns for lead free and it is impossible at this stage to guaranty backward compatibility. If a cell phone, TV or radio fails, no lives are at risk, you just have an upset customer. Therefor this section of the electronics industry falls under the European RoHS directive. On the other hand under hood car electronics, aviation electronics, military electronics and medical (pace makers, defibrillator's etc), peoples lives depend on the reliable function of those devices, this is why this section of the industry is exempt. It is a misconception to think that lead-free is an advanced technology. It is just an effort from the European government to eliminate lead from products easily ending up in the conventional (non-recycled) waste stream. It is not a technology introduced to the industry with benefits such as more economic, better quality or more reliable it's just supposed to be better for the environment. You will not do your company a favor by jumping into lead-free at this stage (hence the exempt). You will do your company (and your customers) a favor to wait until clear reliability reports, standards and field experience is available before switching to lead-free.

Patrick

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javi

#36367

Lead-Free qualification process | 29 August, 2005

Patrick,

See your point. I migth was too focused towards how our EMS could get control of the mixed SMT process and final qualification.

Rgds JaVi

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