Reliability of Conformal Coated Surface Mount Parts
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1 Reliability of Conformal Coated Surface Mount Parts Deng Y. Chen and Dr. Michael Osterman Center for Advanced Life Cycle Engineering (CALCE) University of Maryland, College Park, MD January-4-17 ASTR 2016, Sep 9-11, St. Cambridge, MA 1
2 Introduction Conformal coating is a protective polymer layer that is uniformly applied on the surfaces of PCB assemblies. Coatings are used to protect the electronics from hazardous environments Some conformal coatings have been used for tin whisker mitigation. [1] How To Guide for Atomised Spray conformal Coating of Printed Circuit Boards, Spray-Coat, Accessed June 14, 2016 [2] PCB Coatings, Accessed June 14, September , Pensacola Beach, Florida 2
3 Conformal Coated Interconnect Reliability (1/2) Parylene conformal coating was found to be beneficial for solder joint reliability under temperature shock between -196 o C and room temperature [3]. Pippola studied the thermoshock life of solder joint and found that polyurethane and epoxy coatings reduce the reliability of solder joints [4]. [3] H. M. Tong, L. S. Mok, K. R. Grebe, H. L. Yeh, K. K. Srivastava, and J. T. Coffin Effects of Parylene Coating on the Thermal Fatigue Life of Solder Joints in Ceramic Packages, IEEE Transactions on Components, Hybrids and Manufacturing Technology, Vol. 16, No. 5, pp , [4] Pippola, J., T. Marttila, and Laura Frisk. "Effect of protective casting materials on product level reliability under accelerated test conditions." In Microelectronics Packaging (EMPC), 2013 European, pp IEEE, September , Pensacola Beach, Florida 3
4 Conformal Coated Interconnect Reliability (2/2) Dunn et al examined the effect that various conformal coatings have on the reliability of solder joints through 1000 cycles of -40 o C to 100 o C temperature cycling and found that conformal coatings have negative impact [5]. Polyurethane, epoxy, and silicone coatings had the worst impacts. Lall also found that conformal coating had negative impact on solder joint reliability under temperature cycling, although the type of coating was not specified [6]. Hunt concluded in his study that conformal coating improves the thermomechanical reliability of solder joints under -55 o C to 125 o C temperature cycling [7]. Hunt hypothesized that pliable coatings are beneficial to solder joint reliability. [5] B. D. Dunn, P. Desplat, and W. R. Burke, Evaluation of conformal coatings for future spacecraft applications, European Space Agency, [6] P. Lall, M. N. Islam, J. Evans, J. C. Suhling, T. Shete, Damage Mechanics of Electronics on Metal-Backed Substrates in Harsh Environments, IEEE Transactions on Components Packaging and Technology, Vol. 29, No. 1, pp [7] C. Hunt and M. Dusek, Lead-free Solders and PCB Finish Effects on Solder Joint Reliability, Proceedings of the 1st Electronics Systemintegration Technology, pp , September , Pensacola Beach, Florida 4
5 Motivation Limited studies on the effects of conformal coating on the interconnect reliability are presented in the literature. The studies in the literature present disagreements on the effects of conformal coating on the interconnect reliability under thermomechanical loadings. No study has been reported on the impact drop and vibrational reliability of conformal coated PCB assemblies. September , Pensacola Beach, Florida 5
6 Research Objective To investigate the reliability of effect of conformal coating on surface mount interconnect reliability under temperature cycling, harmonic vibration, and drop tests September , Pensacola Beach, Florida 6
7 Approach Design of Test Vehicle Conformal Coating Application Temperature Cycling -55 to 125 o C, 15 mins dwell Harmonic Vibration 3G and 4G Drop Testing 3000G Failure Data Comparison September , Pensacola Beach, Florida 7
8 Test Vehicle Specifications (1/2) Board Details Coating Components Count 4 Layers Acrylic (50µm) BGA 4 9"x4.5"x0.063" Surface Finish: ImAg Solder: SAC305 CTE x :13.8 ppm/ C CTE y 15.1ppm/ C Parylene like (50µm) None QFP 4 QFN 4 Resistor (50% Pad Width) Resistor (50% Pad Length) September , Pensacola Beach, Florida 8
9 Test Vehicle Specifications (2/2) BGA 192IO s 14mm 14mm CTE xy 7.6(ppm/ o C) Solder mask defined QFP 44 IO s 10mm 10mm CTE xy 15.1 (ppm/ o C) QFP 52IO s 8mm 8mm CTE xy 16.2(ppm/ o C) 2512 Chip Resistor 25mil 12mil CTE xy 4.3 (ppm/ o C) September , Pensacola Beach, Florida 9
10 2512 Resistors Components About 6000 cycles were conducted. Accelerated Stress Testing and Reliability Temperature Cycling Test (-55 to 125 o C, 15 min dwell) Coating Type None Acrylic Parylene Number of Failures BGA 8/8 8/8 8/8 QFP 0/8 0/8 0/8 QFN 8/8 8/8 8/8 (50% Nominal Length) 8/8 8/8 8/8 (50% Nominal Width) 8/8 8/8 8/8 Resistance monitoring is carried out for all components on the board to determine failure. Failure is defined based on the IPC-9701 standard, which defines failure as a 20% increase in initial resistance value for five consecutive scans. September , Pensacola Beach, Florida 10
11 Failure Distribution of BGAs Temperature Cycling Test (-55 to 125 o C, 15 min dwell) Acrylic coated BGAs yield a characteristic life that is very close to the one of noncoated BGAs. Characteristic life of parylene coated BGAs are about twice the characteristic life of noncoated BGAs. Both coating improved the shape parameter of the BGA failure distribution. September , Pensacola Beach, Florida 11.
12 Failure Distribution of QFNs Temperature Cycling Test (-55 to 125 o C, 15 min dwell) Both coatings improved the characteristic life of QFNs under temperature cycling. Acrylic coated QFNs have higher characteristic life than parylene coated QFNs September , Pensacola Beach, Florida 12
13 Schematic of test setup 6.0'' Accelerated Stress Testing and Reliability Harmonic Vibration Test Setup Clamped Ends Direction of vibration 3G and 4G base excitation vibration were exerted on the fixture. The resonant frequency of the boards is about 190Hz. At the resonant frequency, a transmissibility about 28 was observed. September , Pensacola Beach, Florida 13
14 Failure Distributions of BGA Harmonic Unidirectional Vibration (3G at fixture) Both acrylic coating and parylene coating improved the mean cycles to failure of BGAs under 3G vibration. However, arylic coated BGAs have the lowest first time to failure. Parylene coated BGAs have larger improvements. September , Pensacola Beach, Florida 14
15 Failure Distributions of BGA Harmonic Unidirectional Vibration (4G at fixture) At 4G vibration, acrylic coating has little to no impact on the reliability of BGAs under harmonic vibration. Parylene coated BGAs have higher characteristic life than both noncoated BGAs and acrylic coated BGAs. September , Pensacola Beach, Florida 15
16 Drop Test 3" Drop tests were performed on a Lansmont M23 drop tower. Boards were constrained on aluminum plates with 3 inches of unconstraind span. 3000G impact acceleration with 0.35 millisecond pulse width on the fixture. September , Pensacola Beach, Florida 16
17 Failure Distributions (BGA) (1/2) Shock Impact Testing (3000G at fixture) Noncoated BGAs have the highest characteristic life out of all the tested boards under drop test. The failure distributions are very close to each other. September , Pensacola Beach, Florida 17
18 Failure Distributions (BGAs) (2/2) Shock Impact Testing (3000G at fixture) The difference in the failure distribution between the BGAs seems insignificant when plotted with 90% confidence interval. September , Pensacola Beach, Florida 18
19 Summary Both acrylic and parylene like conformal coatings improved the reliability of all of the types of packages under -55 o C to 125 o C temperature cycling. Conformal coating also improved the reliability of surface mount components under 3G and 4G harmonic vibrational loadings. The impact of conformal coating on the surface mount packages seems to be insignificant under drop test. September , Pensacola Beach, Florida 19
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