Burn-in & Test Socket Workshop - BiTS Workshop

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Stage 2 Summary ‣Contact Resistance Experimental Detail / Analysis ‣ Initial readings consistent with expectations ‣ Stacked up resistances identified ‣ Resistance of 0.5mm spring contact significantly higher than 1.0mm and 0.8mm Device Socket Test Card Internal to Device Socket/Contact Pin to Pin Test Point Trace Stacked Resistance Resistance (ohms) 8 7 6 5 4 3 2 1 0 1.0mm 0.8mm 0.5mm 1.0mm 0.8mm 0.5mm 2 Ball Chains 20 Ball Chains Sample Type Internal to Device Socket / Contact Pin to Pin Trace Test Point Trace The Effects of No Lead Solder Balls on Burn-in Socket Design Decisions Page 10
Experimental Detail / Analysis Stage 2 Summary ‣ Ball Sticking ‣ Pre and post stress measurements indicate sticking is clearly quantifiable ‣ Socket actuation force curves were very consistent across socket family Without Sticking Device With Sticking Device ‣ Ball Deformation ‣ Metrics established for ball coplanarity and diameter ‣ Average coplanarity of all balls on a device ‣ Average diameters of all balls on a device Example of force curve Evidence of Sticking Device The Effects of No Lead Solder Balls on Burn-in Socket Design Decisions Page 11
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Burn-in & Test Socket Workshop Marc
Page 3 and 4:
Burn-in & Test Socket Workshop Sess
Page 5 and 6:
Objectives • Determine impact of
Page 7 and 8:
Pb free - Background • Why Pb fre
Page 9 and 10:
Typical Test Setup • Pneumatic co
Page 11 and 12:
PBGA Test Socket Resistance at Cycl
Page 13 and 14:
CBGA Test Socket Resistance • Dai
Page 15 and 16:
CBGA Test Damage 90/10 Leadfree Wit
Page 17 and 18:
CCGA Contact Resistance Average Res
Page 19 and 20: PBGA Contactor Resistance at Burnin
Page 21 and 22: Ball Damage 1.00mm Pitch Contactor
Page 23 and 24: PBGA Contactor Resistance at Burnin
Page 25 and 26: PBGA Contactor Cleaning • Surface
Page 27 and 28: Pb Free Early Learning Summary Con
Page 29 and 30: Up Front Concerns with Lead-Free So
Page 31 and 32: Lead-free Alloy Wish List (Short Li
Page 33 and 34: Undesirable Effects of Other Elemen
Page 35 and 36: Test Objective • Metallurgical Pl
Page 37 and 38: Metallurgical Plating Test • Test
Page 39 and 40: 100 % SN Plated Lead SEM micrograph
Page 41 and 42: Internal Device Resistance Baseline
Page 43 and 44: 90% Sn 10%Pb Tested at Plus 125º C
Page 45 and 46: Resistance in Ohms 0.02 0.018 0.016
Page 47 and 48: 100% Sn Lead Plating Tested at Plus
Page 49 and 50: Resistance in Ohms 0.05 0.045 0.04
Page 51 and 52: 90% Sn 10% Pb Lead Plating Tested a
Page 53 and 54: Resistenance in Ohms 0.035 0.03 0.0
Page 55 and 56: 90% Sn 10%Pb Tested at Plus 125º C
Page 57 and 58: Resistance in Ohmsa 0.03 0.025 0.02
Page 59 and 60: Conclusion • Changes made to cont
Page 61 and 62: The Effects of No Lead Solder Balls
Page 63 and 64: What we asked… Experimental Objec
Page 65 and 66: Evaluation Criteria Overview of Exp
Page 67 and 68: Overview of Experiment Test Methods
Page 69: Stage 2 Objective Experimental Deta
Page 73 and 74: Experimental Detail / Analysis Stag
Page 85 and 86: • General Observations Summary of
Page 87 and 88: Conclusions • Overall performance
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Burn-in & Test Socket Workshop - BiTS Workshop

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