TEST BOARDS FOR AREA ARRAY SURFACE MOUNT PACKAGE THERMAL MEASUREMENTSCONTENTSPageForeword i1 Scope 12 Normative references 13 Stock material 24 Board outline 35 Trace design 35.1 Top trace layer layout (both 1s and 2s2p PCBs) 35.2 Traces to thermal balls 45.3 Trace widths for 1s and 2s2p PCBs 45.4 Ball lands for 1s and 2s2p PCBs 55.5 Thermal ball lands and thermal vias 55.6 Trace layers and connection routing 65.7 Buried layer layout (2s2p PCB only) 75.8 PCB metalization characteristics for 1s and 2s2p PCBs 75.9 Solder masks for 1s and 2s2p PCBs 75.10 Plated through-hole vias for 1s and 2s2p PCBs 86 Hand wiring 87 Data presentation 9Tables1 PCB sizes for packages 32 Drill diameters for thermal vias vs. ball pitch 63 PCB buried plane sizes 74 Wire size current limits 85 Specified parameters and values used 9Figures1a Cross section of 1s PCB showing trace and dielectric thicknesses in package placement 2 and trace fan-out regions 1b Cross section of 2s2p PCB showing trace and dielectric thicknesses 22 BGA test board outer dimensions and edge connector design 33 Traces to outer ball row flared to perimeter 25 mm from package body 34 Flared PCB layout scheme 55 Package footprint routing 56 Nesting of 256 and 352 PBGA packages 77 Routing outside fan-out layer allowed in low conductivity PCB 78 Hand wiring test board suggestion 9-i- JEDEC Standard No. 51-9Foreword Previous thermal test board standards for leaded surface mount components have described the need for a standardized thermal test board design to allow comparison of thermal test results between organizations [1-2]. The present standard describes design standards for a test board that will allow no more than 15% measurement variability to occur between the minimum and maximum design parameters of the specification. The standard is not intended to give actual in-use values, but rather a figure of merit for use in comparing packages. Reference to the board used, 2s (1s effective) or 2s2p, must be made for all reported results.This specification is intended for use with the thermal measurements and modeling specifications grouped under the JEDEC EIA/JESD51 series, [1]. Specifically, the electrical test procedures described in JEDEC EIA/JESD51-1, “Integrated Circuit Thermal Measurement Method - Electrical Test Method (Single Semiconductor Device),” [2], EIA/JESD51-2, “Integrated Circuit Thermal Test Method Environmental Conditions - Natural Convection (Still Air) ”, [3], and EIA/JESD51-6, “Integrated Circuit Thermal Test Method Environmental Conditions - Forced Convection (Moving Air) ”, [4].