We always have problems (both at assembly and more import
Peter,



We always have problems (both at assembly and more importantly with

reliability) when we use PtAg or PdPtAg terminated components.  If you

can find another component that isn't terminated with one of these noble

metal terminations use the alternative.



Regards,

George

George M. Wenger

Andrew Corporation Wireless Network Solutions

Senior Principal FMA / Reliability Engineer

40 Technology Drive, Warren, NJ 07059

(908) 546-4531 [Office]  (732) 309-8964 [Cell]

-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Barton

Sent: Wednesday, January 31, 2007 5:18 AM

To: [log in to unmask]

Subject: [TN] Soldering to Pt/Ag conponent terminations.



We are seeing unusual soldered joints when soldering to components with 

Platinum/Silver metallised terminations. At the margin between the

bottom of 

the component termination and the PCB surface there are a number of 

blowholes in the bulk solder. There also appears to be poor wetting to

the 

vertical end of the termination itself. All other solder joints on the 

assembly in question are good, well wetted and on a number of other

plating 

finishes.



The solder paste is SAC305 and the PCB finish is ENIG. Reflow is carried

out 

in a vapour phase process with a maximum assembly temperature of 235

deg. C. 

Time above liquidus (217 Deg C.) is around 50 seconds.



I have requested feedback from the component manufacturer but it's like 

pulling teeth so in the meantime I an seeking your considered opinions.



Many thanks









-----------------------------------------------------------------------

Peter Barton

Senior Process Engineer

ACW Technology Ltd

Dinas Isaf West

Tonypandy

Mid Glamorgan. CF40 1XX  Wales



Tel: 01443 425275 (direct)

Fax:  023 8048 4882

International Tel : +44 1443 425200

International Fax : +44 23 8048 4882

Website/URL:  www.acw.co.uk



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