2 Sanmina SN100c Spanish
-
Upload
napoleon-torres -
Category
Documents
-
view
216 -
download
0
Transcript of 2 Sanmina SN100c Spanish
![Page 1: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/1.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 1/20
50μm
Copper laminate
Solder fillet
Solder resist
Sn-3.0Ag-0.5Cu
250°C, 3.3 seconds
Copper ErosionCopper Erosion During Wave Soldering
![Page 2: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/2.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 2/20
Sn-3.0Ag-0.5Cu
250°C, 3.3 seconds
50μm
Solder fillet
Copper laminate
Copper ErosionCopper Erosion During Wave Soldering
![Page 3: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/3.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 3/20
After 6 Passes Wave Soldering
105°C Preheat, 256°C Solder Temperature, 4 seconds contact time
Original Pad
18μm Copper
Sn-37Pb Sn-3.0Ag-0.5Cu SN100C
Copper ErosionCopper Erosion During Wave Soldering
![Page 4: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/4.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 4/20
After 6 Passes Wave Soldering
105°C Preheat, 256°C Solder Temperature, 4 seconds contact time
Original Pad
18μm Copper
Sn-37Pb Sn-3.0Ag-0.5Cu SN100C
Copper ErosionCopper Erosion During Wave Soldering
![Page 5: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/5.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 5/20
Copper
Erosion
(μm)
Number of Times
Wave Soldered
EXTENT of Cu EROSION on SOLDER SIDE PADS
as a FUNCTION of the NUMBER of TIMES WAVE SOLDERED
OSP Finish
Kyoden Ltd (Japan) Cu Erosion Study
Copper ErosionCopper Erosion During Wave Soldering
SAC305
SN100C
![Page 6: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/6.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 6/20
Copper
Erosion
(μm)
Number of Times
Wave Soldered
EXTENT of Cu EROSION on INSIDE WALL of THROUGH HOLES
as a FUNCTION of the NUMBER of TIMES WAVE SOLDERED
OSP Finish
Ref: Kyoden Ltd
Kyoden Ltd (Japan) Cu Erosion Study
Copper ErosionCopper Erosion During Wave Soldering
SAC305
SN100C
![Page 7: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/7.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 7/20
Repaired 5 times
Tip temperature: 35 ℃
Spec of the board
Pad depth: 16μm
Pad width : 0 165
mm
Distance between pads
: 0 165mm
SAC305
SN100C
Disappearance of
Cu tracks due to
erosion
Copper ErosionCopper Erosion During Rework
![Page 8: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/8.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 8/20
What has been the experience with SAC Alloys?
Stainless Steel Erosion
![Page 9: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/9.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 9/20
Stainless Steel Erosion
![Page 10: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/10.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 10/20
Stainless Steel Erosion
![Page 11: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/11.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 11/20
ENVIRONMENTAL IMPACT
Environmental Impact of Silver
![Page 12: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/12.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 12/20
Environmental Impact of Silver
![Page 13: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/13.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 13/20
Better
Worse
![Page 14: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/14.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 14/20
Environmental Impact of Silver
![Page 15: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/15.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 15/20
What is the electronics industrygoing to use
after SAC305?
SAC305
The real question…..
After ?
![Page 16: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/16.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 16/20
What is the alternative to Sn-Ag-Cu Lead-free Solders?
Sn-Ag- CuAdvantages of Sn-Cu
• Lowest raw material cost
• Low environmental impact
• Raw material readily available
•
Does not complicate recycling ofelectronic assemblies
• Simple so easy to manage
![Page 17: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/17.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 17/20
There is a convenient eutectic in
the Sn-Cu System
Cu6Sn5
Eutectic at 0.7Cu
![Page 18: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/18.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 18/20
Sn-0.7%Cu
Cooling Rate ~50C/sec
But the solidification behaviour is nearly as bad as SAC305
![Page 19: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/19.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 19/20
Sn-0.7Cu
Primary β-Sn
dendrites
Cooling rate ~ 5°C/sec
The Sn-0.7Cu alloy does not freeze as a eutectic
![Page 20: 2 Sanmina SN100c Spanish](https://reader030.fdocuments.us/reader030/viewer/2022021321/577cc4561a28aba71198f269/html5/thumbnails/20.jpg)
8/11/2019 2 Sanmina SN100c Spanish
http://slidepdf.com/reader/full/2-sanmina-sn100c-spanish 20/20
Primary β-Sn
Dendrites
EutecticMatrix
The Sn-0.7Cu alloy does not freeze as a eutectic