EXTENSION OF THERMAL TEST BOARD STANDARDS FOR PACKAGES WITH DIRECT THERMAL ATTACHMENT MECHANISMS(From JEDEC Board Ballot JCB-98-93, formulated under the cognizance of the JC-15.1 Committee on Thermal Characterization.)1 Background Previous JEDEC standards [1-2] and other test board standards residing under the thermal measurement overview document [3] have described design specifications for construction of thermal test boards. These specifications were intended for conventional leaded and leadless packages. They did not address packages designed with the intention of direct thermal attachment to the test board such as deep downset packages or thermally tabbed packages. This specification provides additional design detail for use in developing thermal test boards with application to these package types. The design detail is in addition to and not in replacement of the design specifications of those previous standards.This specification should be used in conjunction with the electrical test procedures described in JESD51-1, “Integrated Circuit Thermal Measurement Method - Electrical Test Method (Single Semiconductor Device),” [4], and JESD51-2, “Integrated Circuit Thermal Test Method Environmental Conditions - Natural Convection (Still Air),” [5].1.1 ReferencesJESD51-3, “Low Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages.” JESD51-7, “High Effective Thermal Conductivity Test Board for Leaded Surface Mount Packages.”JESD51, “Methodology for the Thermal Measurement of Component Packages (Single Semiconductor Device).”JESD51-1, “Integrated Circuit Thermal Measurement Method - Electrical Test Method (Single Semiconductor Device).”JESD 51-2, “Integrated Circuit Thermal Test Method Environmental Conditions - Natural Convection (Still Air).”