another example of penny wise and dollar fool...
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Thursday, October 24, 2002 7:06 PM
To: [log in to unmask]
Subject: Re: [TN] Side and Toe Fillets...From IPC
Hi Jack,
The leads are NOT copper (as I have found out), but Phosphor Bronze, the
plating is as follows:
Hard Gold Deposit
- Cobalt: .15 - .3%
- Hardness: 130-200 Knoops
- Deposit Purity: 99.7%
- Deposit Density: 17.5 g/cc
- MIL-G45204C TYPE 1 & TYPE 2 GRADE C
Copper Flash Deposit
- Grain Structure: Fine Grain (equiaxed)
- Density: 8.9 g/cm
- Conductivity: .59 microohms/cm
- Purity: 99.9% Copper
- Solderability: Excellent
- Hardness: 100-120 VPN
- Elongation: 10-25%
- Tensile Strength: 40-50 KPSI
- MIL-P-55110-D
Tin Deposit
- Purity: 100% Tin
- - Appearance: Bright
- Solderability: Excellent
- Density: 7.3 g/cc
- MIL-T-10727B
Nickel Deposit
- Purity: 99.9% Nickel
- Hardness: 200 - 450 K25
- Density: 8.9 g/cc
- Compressive Strength: 0 - 1000 PSI
- Tensile Strength: 103,000 PSI
- Elongation: 10 - 25%
- QQ-N-290A
I called SAMTEC, and the gentleman that I spoke with acknowledged that
the appearance that I see in the solder joints, is what it is...there
won't be any side or toe wetting. They do have a similar socket called
their SMM series (instead of the CLT series that we use now), that have
formed leads instead of stamped leads, and doesn't have the exposed base
metal that we see with the CLT series...more dollars of course, but hey,
you get what you pay for, right?
Hope they will work...a little taller than the CLT's, but maybe, just
maybe, the assembly gods will smile on me and allow the SMM's to drop
in. We'll see....
-Steve Gregory-
3. Steve, you may not have copper leads; under normal lighting
conditions Kovar/Alloy 42/copper look about the same. Looking at those
leads using different lighting color temperatures varying from 3,000 deg
K to 4,500 deg K will differentiate between the metals. The concern
should be whether it is known to be wettable and it won't. If the sides
of some leads on the same components wet and others don't, you have a
process problem to troubleshoot.
Jack Crawford
Director, Professional Development and Assembly Technology
[log in to unmask]
847-790-5393
fax 847-504-2393
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