SOLDER JOINT RELIABILITY TEST SUMMARY

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1 Project Number: SJR Tracking Code: TC0623-SEAF-SJR-1059 Requested by: Jeremy Wooldridge Date: 05/20/2008 Product Rev: D (SEAF), C (SEAM) Part #: SEAF S-10-2-A/ SEAM S-10-2-A SEAF S-10-1-A/ SEAM S-10-1-A SEAF S-10-2-A/ SEAM S-10-2-A Lot #: Tech: Troy Cook Eng: Dave Scopelliti Female/ Single Ended Array Male Qty to test: 96 Test Start: 10/23/2006 Test Completed: 04/23/2007 SOLDER JOINT RELIABILITY TEST SUMMARY Solder Joint Reliability Summary Report PART DESCRIPTION SEAF S-10-2-A mated with SEAM S-10-2-A SEAF S-10-1-A mated with SEAM S-10-1-A SEAF S-10-2-A mated with SEAM S-10-2-A Revision 02 1 of 18 7/21/2008

2 CERTIFICATION All instruments and measuring equipment were calibrated to National Institute for Standards and Technology (NIST) traceable standards according to IS l and ANSI/NCSL , as applicable. All contents contained herein are the property of Samtec. No portion of this report, in part or in full shall be reproduced without prior written approval of Samtec. SCOPE To perform the following tests: Solder Joint Reliability and life expectancy predictions via Thermal Cycling of Tin- Silver-Copper (SAC) and Tin-Lead (SnPb). SAMPLES TESTED Three groups of SEAF/SEAM connectors were evaluated with stack heights of 7 or 10 mm: Group A: SAC, 7 mm stack (SEAF 5.0 mm + SEAM 2.0 mm) Group C: SAC, 10 mm stack (SEAF 6.5 mm + SEAM 3.5 mm) Group D: SnPb, 10 mm stack (SEAF 6.5 mm + SEAM 3.5 mm) RELIABILITY PROJECTIONS 1. Life expectancy is calculated for field service conditions of 25ºC to 45ºC and 25ºC to 55ºC cycles based on lower bound values of Weibull parameters. 2. Field use cycles are calculated at 6 (Cycles/Day) x (Days/Year) = Cycles/Year. TABLE 1a: Reliability projections under field use condition for Groups C & D (10mm mated pairs). Years to 0.01% Failed Condition: 25ºC to 45ºC, 6 cycles/day Group C SAC Group D SnPb 100+ years 99 years TABLE 1b: Reliability projections under field use condition for Groups C & D (10mm mated pairs). Years to 0.01% Failed Condition: 25ºC to 55ºC, 6 cycles/day Group C SAC Group D SnPb 56 years years Revision 02 2 of 18 7/21/2008

3 TABLE 2a: Reliability projections under field use condition for Group A (7mm mated pairs). Years to 0.01% Failed Condition: 25ºC to 45ºC, 6 cycles/day Group A SAC 100+ years TABLE 2b: Reliability projections under field use condition for Group A (7mm mated pairs). Years to 0.01% Failed Condition: 25ºC to 55ºC, 6 cycles/day Group A SAC 56 years Revision 02 3 of 18 7/21/2008

4 APPLICABLE DOCUMENTS Industry Standard: IPC-9701A Clech, J-P., "Acceleration factors and thermal cycling test efficiency for lead-free Sn-Ag-Cu assemblies", Proceedings, SMTA International Conference, Chicago, IL, Sept , 2005, pp Clech, J-P., "An obstacle-controlled creep model for Sn-Pb and Sn-based lead-free solders", Proceedings, SMTA International Conference, Chicago, IL, September 26-28, Clech, J-P., Review and Analysis of Lead-Free Solder Material Properties, NIST report, on-line version can be viewed under NIST's Metallurgy Division web site: Clech, J-P., Solder Reliability Solutions: a PC-based design-for-reliability tool, Proceedings, Surface Mount International Conference, Sept. 8-12, 1996, San Jose, CA, Vol. I, pp Also in Soldering and Surface Mount Technology, Wela Publications, British Isles, Vol. 9, No. 2, July 1997, pp Revision 02 4 of 18 7/21/2008

5 TEST SAMPLES AND PREPARATION Sample preparation was performed in accordance with paragraph and of IPC-9701A and the following test conditions: 1) All materials were manufactured in accordance with the applicable product specification. 2) All test samples were identified and encoded to maintain traceability throughout the test sequences. 3) All components were preconditioned prior to soldering at 125 C for 24 hours. 4) All test PCB s were preconditioned prior to soldering at 105 C for 24 hours. 5) All samples tested were preconditioned after soldering prior to testing at 100 C for 24 hours. 6) Samtec Test PCBs used: PCB TST-0X (IS410), IS410, inches thick, 6-layer with 70 Cu coverage on layers 2 and 4, 40% Cu coverage on layers 3 and 5. The pads are finished with Electroless Nickel Immersion Gold. TEST BOARD ASSEMBLY FIGURE 1: Soldering profile for SnPb samples. Revision 02 5 of 18 7/21/2008

6 FIGURE 2: Soldering profile for SAC samples. 1) SnPb samples used Kester HM531 Type 3 Solder Paste containing Sn63 Pb37, 90% metal, 325 mesh. 2) SAC samples used Kester R520A Type 3 Solder Paste containing Sn96.5 Ag3.0 Cu0.5, 89.5% metal, 325 mesh. 3) For both SnPb and SAC, stencil thickness was inches with aperture diameter of 0.04 inches. Revision 02 6 of 18 7/21/2008

7 THERMAL CYCLING: Thermal Cycling was performed in accordance with Table 4-1 of IPC-9701A and the following test conditions: 1) Thermal Limits: Low Temperature = 0 C +0/- 3 C; High Temperature = 100 C + 5/- 0 C 2) Dwell Time at Thermal Limits: Ten (10) minutes 3) Ramp Time to Thermal Limits: Ten (10) minutes FIGURE 3: Accelerated thermal cycling profile. Figure 3 above is a picture of a Thermotron 2 hour temperature graph. Thermocouples are placed in the air of the chamber and attached to PCB on 5 random samples. The solid line represents the chamber air temperature and the dotted line represents the temperature on a sample. Revision 02 7 of 18 7/21/2008

8 CONFIGURATION FIGURE 4: Groups A, C, & D consists of 32 mounted mated pair samples each. Group B was mounted but not tested. Signal routing is daisy-chained through all positions on each sample facilitating 100% contact monitoring. EVENT DETECTION: 1) Events are established in accordance with Paragraph of IPC-9701A and Table ) An event is defined as a Signal Interruption exceeding 1000 Ω lasting for greater than 200 nanoseconds. FAILURE CRITERIA: 1) Failures were established in accordance with Paragraph of IPC-9701A and Table 4-4 2) A failure was defined as 10 events within an elapsed time of 10% of the thermal cycles to the initial event. I.e. if the first event happens at cycle 1000, 9 more events need to happen by cycle ) Thermal Cycling was terminated when 62% of the product fails or 6000 cycles are completed. This test was stopped at 5929 cycles because the cooling compressor on the Thermotron chamber failed at that cycle. Revision 02 8 of 18 7/21/2008

9 FLOWCHART Thermal Cycling for SJR (0-100 degrees C) 32 mated assemblies 32 mated assemblies 32 mated assemblies TEST GROUP A (SE Array) GROUP C (SE Array) GROUP D (SE Array) STEP Lead-Free Paste Lead-Free Paste Leaded Paste IPC-9701A, 32 samples IPC-9701A, 32 samples IPC-9701A, 32 samples 10 Min Ramp 10 Min Ramp 10 Min Ramp 10 Min dwell at T-Limits 10 Min dwell at T-Limits 10 Min dwell at T-Limits 01 Etch ID# on each component Etch ID# on each component Etch ID# on each component 02 Component Conditioning Component Conditioning Component Conditioning 03 PCB Conditioning PCB Conditioning PCB Conditioning 04 Solder components to PCB's Solder components to PCB's Solder components to PCB's 05 Assembly Conditioning Assembly Conditioning Assembly Conditioning 06 X-Ray Analysis of Assemblies X-Ray Analysis of Assemblies X-Ray Analysis of Assemblies 07 Mate and # mated assemblies Mate and # mated assemblies Mate and # mated assemblies 08 Measure assembly resistance Measure assembly resistance Measure assembly resistance 09 Solder lead wires to assemblies Solder lead wires to assemblies Solder lead wires to assemblies 10 Orient samples in test chamber Orient samples in test chamber Orient samples in test chamber 11 Measure assembly resistance - through cable/connector Measure assembly resistance - through cable/connector Measure assembly resistance - through cable/connector 12 Begin thermal cycling Begin thermal cycling Begin thermal cycling 13 Start event detection Start event detection Start event detection 14 Cycle chamber 6000x Cycle chamber 6000x Cycle chamber 6000x 15 Measure assembly resistance - through cable/connector Measure assembly resistance - through cable/connector Measure assembly resistance - through cable/connector 16 Cross-Section Analysis of 3 samples from each group Cross-Section Analysis of 3 samples from each group Cross-Section Analysis of 3 samples from each group FIGURE 5: Flowchart for SJR test. Revision 02 9 of 18 7/21/2008

10 RESULTS Group A (SAC, 7 mm stack assemblies): Four failures out of 32 monitored daisy chains at 5929 test cycles Failure Percentage % Failure# Failure# Failure# Failure# The Weibull shape parameter was determined using the same β as for SnPb assembly, i.e. β = Characteristic life was then estimated from Weibull equation: % Fail at 1st failure = 1/32 = 1-exp[ -(6917 / α )^4.736 ] which gives α = 14,331. Group C (SAC, 10 mm stack assemblies): One failure out of 32 monitored daisy chains at 5929 test cycles Failure Percentage % Failure# Two-parameter Weibull analysis of failure cycles gives: Characteristic life: α = Cycles to 63.2% Failures = cycles Shape parameter (slope of Weibull distribution): β = Group D (SnPb, 10 mm stack assemblies): Two failure out of 32 monitored daisy chains at 5929 test cycles Failure Percentage % Failure# Failure# Two-parameter Weibull analysis of failure cycles gives: Characteristic life: α = Cycles to 63.2% Failures = cycles Shape parameter (slope of Weibull distribution): β = Revision of 18 7/21/2008

11 DETERMINING ACCELERATION FACTOR The acceleration factors were determined in Calculations for Solder Joint Reliability Summary Report, which is located in the same Mechanical Test Reports section as this report. MEASURED PATH RESISTANCES OF SAMPLES Group A Path Resistances, Ω Δ Passed Δ Failed Before Test Samples Samples Minimum Maximum Average St. Dev Group D Path Resistances, Ω Δ Passed Δ Failed Before Test Samples Samples Minimum Maximum Average St. Dev Group C Path Resistances, Ω Δ Passed Δ Failed Before Test Samples Samples Minimum Maximum Average St. Dev N/A FIGURE 7: Path resistances of daisy-chained samples through 18 ft. lead wires. Revision of 18 7/21/2008

12 CROSS SECTION ANALYSIS 1. Cross sectional metallographic evaluation was performed on all 3 groups of SJR samples. Revealing the microstructure of the solder joints depicts the cracks that caused failures in samples. 2. Cross sections were taken on: i. Group A: Three failure samples of SAC, 7 mm stack ii. Group C: One failure and two passing samples of SAC, 10 mm stack iii. Group D: Two failures and one passing sample of SnPb, 10 mm stack FIGURE 8: Sectioning pattern used for Metallographic Evaluation Revision of 18 7/21/2008

13 FIGURE 9: Photomicrograph showing failed solder joint of Sample #42, Row 1 (7mm Lead-free, failed) FIGURE 10: Photomicrograph showing failed solder joint of Sample #44, Row 1 (7mm Lead-free, failed) Revision of 18 7/21/2008

14 FIGURE 11: Photomicrograph showing failed solder joint of Sample #48, Row 1 (7mm Lead-free, failed) FIGURE 12: A partial crack showing on a passed solder joint of Sample #81, Row 1 (10mm Lead, passed) Revision of 18 7/21/2008

15 FIGURE 13: Photomicrograph showing on a failed solder joint of Sample #99, Row 1 (10mm Lead, failed) FIGURE 14: Photomicrograph showing on a failed solder joint of Sample #105, Row 1 (10mm Lead, failed) Revision of 18 7/21/2008

16 FIGURE 15: Photomicrograph showing a solder joint of Sample #123, Row 1 (10mm Lead-free, passed) FIGURE 16: Photomicrograph showing a solder joint of Sample #129, Row 1 (10mm Lead-free, failed) Revision of 18 7/21/2008

17 FIGURE 17: Photomicrograph showing a solder joint of Sample #148, Row 1 (10mm Lead-free, passed) Revision of 18 7/21/2008

18 Equipment #: MM-01 Description: Digital Multimeter Manufacturer: Fluke Model: 87 III Serial #: Accuracy: See Manual Last Cal: 06/14/07, Next Cal: 06/14/08 EQUIPMENT AND CALIBRATION SCHEDULES Equipment #: THC-02 Description: Temperature/Humidity Chamber Manufacturer: Thermotron Model: SE Serial #: Accuracy: See Manual Last Cal: 09/21/07, Next Cal: 09/21/08 Equipment #: ED-01 Description: STD Series Event Detector Manufacturer: Analysis Tech Model: 256 Serial #: Accuracy: See manual Last Cal: 06/18/07, Next Cal: 06/18/08 Revision of 18 7/21/2008

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