Conductive Paste-Based Interconnection Technology for High Performance Probe Card Sang-il Kwon Eddy Kang TSE Co., Ltd.
Overview Introduction of TABP Technology Key Technology of Core to Core Interconnection Test Results & Application Examples Electrical & Thermal Reliability of Core to Core Interconnection PCB by Actual Application Probe Card Application by Design Rules Conclusions 2
Who we are TSE Co., Ltd. Probe Card Load Board Affiliated Companies Memory Test Board Test Socket 3
What is TABP? TABP = TSE Advanced Bump PCB Core to core interconnection PCB Before After Core Pad Bismuth Tin Sintered Copper/Tin Alloy Metal Network Copper Liquid Organic Formulation Core Pad <Structural Change of Conductive Paste by Sintering> Electrical Interconnection <Section View> 4
Advantages of TABP Free of Thick Board Drilling Free of High Aspect Ratio Via Hole Plating Reducing Complexity of Back Drilling Enhance Fabrication Capability for Fine Pitch HDI PCBs IST Coupon Layup Structure Cross Section L01 L09 1.5mm - Min. Pitch : 0.4mm -Layer Count: 34 - Thickness : 6.4mm - Aspect Ratio : 51.2 - Via Size : 0.125mmΦ - PCB Size : 12.7mm x 50.8mm A/R: 12 A/R: 51.2 L10 L17 L18 L25 L26 L34 6.4mm 1.5mm 1.5mm 1.5mm 5
TABP Fabrication Process Flow Prepreg Tacking Type Tacking Laser Drill Paste Filling Remove PET CORE Hot Press PET PP PET PET PP PET PET PP PP PP PET Conductive Paste Pocket Conductive Paste CORE Core & Prepreg Tacking Type Tacking Laser Drill Paste Filling Remove PET Hot Press PET PP CORE PET PP CORE Conductive Paste Pocket PET PP CORE Conductive Paste PP CORE CORE PP CORE 6
Key Technology TABP Electrical Conductivity (TSE Advanced Bump PCB) Thermal Reliability Perfect Sintered Alloy Structure Sufficient Amount of Paste Fill Optimized Forming of Conductive Paste Pocket Withstanding Thermal Stress Sintered Alloy Bonding Layer Sufficient Resin at Bonding Layer Optimized Material, Layup & Design 7
Electrical Conductivity Coupon Board - 0.5mm Pitch 12DUTs & 0.4mm Pitch 12DUTs - Each Via has 1 TABP interconnection. - BGA Count of Each DUT = 1,024 - Each Via in Same DUT connected by Daisy Chain - PCB Thickness = 1.2mm DC Interconnection Resistance Values Daisy Chained DUT Each BGA Via BGA Pitch (1,024 BGA 24DUTs) (Total Count=24,576Ea) 0.5mm Max. 6.0Ω 6.65mΩ (12DUTs) Min. 5.64Ω 4.64mΩ 0.4mm Max. 7.63Ω 7.05mΩ (12DUTs) Min. 7.25Ω 4.81mΩ Measured by DVM, Microcraft EMX6151 8
Electrical Conductivity Hole Resistance (mω) Via Holes Resistance of 1 DUT Cross Section of Test Coupon 50 40 30 20 10 0 1 4 7 10 13 16 19 22 25 28 31 1 5 9 13 17 29 25 21 - BGA Pitch : 0.4mm - 1,024 TABP Vias in 1DUT - Max Via Hole resistance : 7.05mΩ - Laser Drill Diameter : 150μm - Prepreg Thickness : 110μm <Stable Sintered Alloy Structure> 9
Thermal Reliability Cross Section Analysis after Solder Pot Floating Test - Thermal Impact Condition : 3 Times, 288 C Solder Pot Floating 10sec - BGA Count per Each DUT : 100, 600, 1024 & 1600 Ea - Each Via in Same DUT connected by Daisy Chain - All BGA Interconnection Test was passed. - TABP can withstand Thermal Impact of Solder Floating Test. After Lamination After Out Layer Formation After Printing All passed after 3X T/I All passed after 3X T/I All passed after 3X T/I 10
Thermal Reliability Resistance Changes after Solder Reflow Exposures - Reflow Condition : 6 Times Reflow @260 C - BGA Count per Each DUT : 100, 600, 1024 & 1600 Ea - Each Via in Same DUT connected by Daisy Chain - All BGA Interconnection Test was passed. - IPC Standards for DC Resistance Change after Reflow : Max 10% 10 % 5 % 0 % -5 % -10 % 10 % 5 % 0 % -5 % -10 % Resistance Change of 100BGA 2.25 4.65 4.44 reflow 6 time 5.56 Hole 100-5 Hole 100-6 Hole 100-7 Hole 100-8 Resistance Change of 1024BGA 1.99 0.90 1.69 reflow 6 time 0.36 Hole 1024-5 Hole 1024-6 Hole 1024-7 Hole 1024-8 10 % 5 % 0 % -5 % -10 % 10 % 5 % 0 % -5 % -10 % Resistance Change of 600BGA reflow 6 time -1.28-2.55-2.06-2.32 Hole 600-5 Hole 600-6 Hole 600-7 Hole 600-8 Resistance Change of 1600BGA 3.63 0.65 1.93 reflow 6 time 3.97 Hole 1600-5 Hole 1600-6 Hole 1600-7 Hole 1600-8 11
Thermal Reliability Cross Section Analysis after 6x Reflow Exposure - Board Profile : 296FBGA, 0.35mm Pitch, 4mmT, 3 TABP, 0.15mmΦ Laser Drill - Applied Thermal Impact Condition : 6 Times Reflow @260 C - TABP s Structural Stability can withstand 6 times of Reflow Condition. < Cross Section after Thermal Impact> Stable Paste Structure & Bonding Condition 12
TABP Application Examples Load Board 0.4mm Pitch, Aspect Ratio 41.3 Board Profiles - BGA Pitch : 0.4mm Pitch - Layer Count : 38L - Thickness : 6.2mm - Via Size : 0.15mmΦ - Aspect Ratio : 41.3 - PCB Size : 340mm x 520mm - Option : TABP + HPL + Back Drill Structure (BGA) 0.4mmP (BGA) 0.4mmP 6.2mm 0.125Φ 0.15Φ Cross Section Unnecessary Stubs Reduced 13
TABP Application Examples Memory Test Board 0.35mm Pitch, Aspect Ratio 28 Board Profiles Structure Cross Section - BGA Pitch : 0.35mm - Layer count : 38 - Thickness : 3.5mm - Via Size : 0.125mmΦ - Aspect Ratio : 28 - PCB Size : 59mm x 109 mm - Option : TABP + HPL + Back Drill 14
TABP Application Examples Pretest Coupon - 0.3mm Pitch, Aspect Ratio 62 Board Profiles - BGA Pitch : 0.3mm - Layer Count : 34 - Thickness : 6.2mm - Via Size : 0.1mmΦ - Aspect Ratio : 62 - PCB Size : 26mm x 26mm - Option : TABP + HPL + Back Drill Structure Cross Section L01 L09 L10 L17 6.2mm L18 L25 L26 L34 15
Challenges for Probe Card PCB High Layer Count / High Aspect Ratio SI Performance for High Speed Application Design/Fabricate PCB at Competitive Conditions TABP is a Solution for Advanced Probe Card PCB. by Eliminating of Thick Board Drilling by Eliminating of High Aspect Ratio Via Plating by Reducing Drilling Complexity & Improving Yield 16
Design Rule for 0.8mm Pitch P/C PCB 0.8P 0.8P in Double Line Array Plating Through Hole Type DRILL A LAND 6.2mm CLEAR C B 0.25Φ Drill Dia. A/R Line Width A B C Land to Line Line to Line Drill to Metal 250μmΦ 24.8 80μm 80μm 80μm 155μm 17
Design Rule for 0.8mm Pitch P/C PCB TABP Type 0.8P 0.8P 0.8P 2.06mm in Double Line Array DRILL LAND A 2.06mm 6.2mm TABP CLEAR C B 2.06mm 0.125Φ Drill Dia. A/R Line Width 125μmΦ 49.6 (16.5) A B C Land to Line Line to Line Drill to Metal 80μm 90μm 160μm 177μm 18
Conclusions Conductive Paste Based Core to Core Interconnection Technology at PCB was realized. Especially excellent core to core conductivity and thermal reliability were proved. Therefore, we hope the TABP technology would pave the way for fine pitch and high aspect ratio PCB fabrication. 0.4mm Pitch, Aspect Ratio 41.3 Load Board & 0.3mm Pitch, Aspect Ratio 62 Board were possible to fabricated with TABP Technology. Test boards for wafer test also need TABP technology to respond for the requirement of multi sites, fine pitch and high frequency performance. 19
Thank you very much. Questions? 20