TEST BOARDS FOR THROUGH-HOLE AREA ARRAY LEADED PACKAGE THERMAL MEASUREMENTSCONTENTSPageForeword ii1 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 Trace widths for 1s and 2s2p PCBs 45.3 Plated through-hole vias 55.4 Trace layers and connection routing 55.5 Buried layer layout (2s2p PCB only) 65.6 PCB metalization characteristics for 1s and 2s2p PCBs 75.7 Solder masks for 1s and 2s2p PCBs 76 Hand wiring 77 Data presentation 8Tables1 PCB sizes for packages 32 PCB buried plane sizes 63 Wire size current limits 74 Specified parameters and values used 8Figures1a Cross section of 1s PCB showing trace and dielectric thicknesses in package placement 21b and trace fan-out regionsCross 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 45 Nesting of 256 and 352 PBGA packages 66 Routing outside fan-out layer allowed in low conductivity PCB 67 Hand wiring test board suggestion 8-i- JEDEC Standard No. 51-11Foreword The measurement of the junction-to-ambient (RJA) thermal characteristics of an integrated circuit (IC) has historically been carried out using a number of test fixturing methods. The most prominent method is the soldering of the packaged devices to a printed circuit board (PCB). The characteristics of the test PCBs can have a dramatic (>60%) impact on the measured RJA . Due to this wide variability, it is desirable to have an industry-wide standard for the design of PCB test boards to minimize discrepancies in measured values between companies.To obtain consistent measurements of RJA from one company to the next, the test PCB geometry and trace layout must be completely specified for each package geometry tested. Such a complete specification would limit the flexibility of user companies who would like to design test boards for their individual needs. Thus, one characteristic of a test board specification is to allow some variability of PCB test board design while minimizing measurement variability.This specification is intended for use with the thermal measurements and modeling specifications grouped under JEDEC EIA/JESD 51, [1]. Specifically, the electrical test procedures described in JEDEC EIA/JESD 51-1, “Integrated Circuit Thermal Measurement Method - Electrical Test Method (Single Semiconductor Device),” [2], and 51-2, “Integrated Circuit Thermal Test Method Environmental Conditions - Natural Convection (Still Air), [3], and 51-6, “Integrated Circuit Thermal Test Method Environmental Conditions - Forced Convection (Moving Air), [4].-ii- JEDEC Standard No. 51-11Page 1TEST BOARDS FOR THROUGH-HOLE AREA ARRAY LEADED PACKAGE THERMAL MEASUREMENTS(From JEDEC Board Ballot JCB-00-59, formulated under the cognizance of the JC-15.1 Subcommittee on Thermal Characterization.)1 Scope This specification covers through-hole area array leaded packages intended to be mounted on a PCB. It does not cover area array packages that require sockets.2 Normative references [1] JESD 51, Methodology for the Thermal Measurement of Component Packages (Single Semiconductor Device).[2] JESD 51-1, Integrated Circuit Thermal Measurement Method - Electrical Test Method (Single Semiconductor Device).[3] JESD 51-2, Integrated Circuit Thermal Test Method Environmental Conditions - Natural Convection (Still Air).[4] JESD 51-6, Integrated Circuit Thermal Test Method Environmental Conditions - Forced Convection (Moving Air).[5] Electronics Engineer’s Handbook, 3rd Edition, Edited by D.G. Fink and D. Christiansen,McGraw-Hill Book Co., NY, 1989, p 6.16[6] MIL-W-5088L, Amdt. 1, Wiring, Aerospace Vehicle[7] IPC-2222, Sectional Design Standard for Rigid Organic Printed Boards[8] IPC-2221, Generic Standard on Printed Board Design