Hi Ted:
What was your particular land design ( shape of the lands ) for the 0402s that work well for you?
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ted Kong
Sent: Wednesday, September 29, 2004 12:17 PM
To: [log in to unmask]
Subject: Re: [TN] ENIG vs. HASL plating with 0.5 mm pitch QFN components
Hi, Joe,
one of our design has 0402 and QFNs on the board and
we use HASL with 4 mils stencils. Our factory did not
report any issue. One thing to keep in mind is that
you must have a good pad design for 0402 land pattern
to prevent insufficient solder or tombstoning.
Ted
--- "Wenger, George M." <[log in to unmask]>
wrote:
> Paul,
>
> I didn't make any comment about planarity or
> indicate that HASL couldn't be controlled and used
> for 0.5mm pitch because there are lots of companies
> using HASL for 0.5mm pitch. The reason I wouldn't
> recommend HASL is because of the pending RoHS/WEEE
> directives.
>
> Regards,
> George
>
> George M. Wenger (908)-546-4531
> Reliability / FMA Engineer
> Base Station and Subsystems Group
> Andrew Corporation, 40 Technology Drive, Warren, NJ
> 07059
> [log in to unmask]
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of
> Paul Edwards
> Sent: Monday, September 27, 2004 4:34 PM
> To: [log in to unmask]
> Subject: Re: [TN] ENIG vs. HASL plating with 0.5 mm
> pitch QFN components
>
>
> Joe,
>
> I disagree with Paul and George...
>
> The planarity issue with HASL on .5mm pitch parts is
> over blown.
> A good PCB fabricator can control HASL variations.
>
> HASL increases the volume of solder in the lap joint
> and increases and
> lowers the joint's bulk interface intermetallics.
>
>
> Paul
>
> Paul Edwards
> Process Engineering
> [log in to unmask]
> Tel: 408-433-4700
> FAX: 408-433-9988
> Surface Art Engineering
> 81Bonaventura Dr.
> San Jose, CA 95134
> DUNS: 944740570
> CAGE/NCAGE: 1XZ48
>
> -----Original Message-----
> From: Black, Paul [mailto:[log in to unmask]]
> Sent: Monday, September 27, 2004 11:40 AM
> To: [log in to unmask]
> Subject: Re: [TN] ENIG vs. HASL plating with 0.5 mm
> pitch QFN components
>
> Joe,
>
> I would agree with George on both counts. In any
> case, I wouldn't choose
> HASL. It doesn't deposit evenly. In the case of your
> fine pitch and small
> components, you could end up with reliability
> issues.
>
> Thank you,
> Paul Black
> Manufacturing Engineer
> Kronos
> E-mail: [log in to unmask]
> Voice: (978) 947-1520
> Fax: (978) 244-0568
> www.kronos.com
> Improving the Performance of People and Business(tm)
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of
> Wenger, George M.
> Sent: Monday, September 27, 2004 1:21 PM
> To: [log in to unmask]
> Subject: Re: [TN] ENIG vs. HASL plating with 0.5 mm
> pitch QFN components
>
>
> Joe,
>
> Were you asked to recommend the type of pwb plating
> that is best for your
> simple board or were you only given two choices to
> pick from? If I had to
> pick from the two choices I'd pick ENIG. If I had
> to make a recommendation
> I wouldn't recommend either. My preference would be
> immersion silver.
>
> Regards,
> George
>
> George M. Wenger (908)-546-4531
> Reliability / FMA Engineer
> Base Station and Subsystems Group
> Andrew Corporation, 40 Technology Drive, Warren, NJ
> 07059
> [log in to unmask]
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of
> Macko, Joe @ IEC
> Sent: Monday, September 27, 2004 1:08 PM
> To: [log in to unmask]
> Subject: [TN] ENIG vs. HASL plating with 0.5 mm
> pitch QFN components
>
>
> Fellow techs,
>
> I have been asked to recommend the type of pwb
> plating that is best for a
> simple board with only a few components. The finest
> pitch component is a
> QFN, 64 pads, 0.5 mm pitch. There are some 0402
> resistors and capacitors as
> well.
>
> My 2 choices are HASL or ENIG. Would someone please
> comment on which is
> best for 0402 and 0.5 mm QFN type components.
>
> Thanks in advance.
> joe
>
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