Transcription of IPC-TM-650 TEST METHODS MANUAL
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IPC-TM-650 TEST METHODS MANUAL
1 ScopeThese METHODS determine the physical enduranceof representative coupons of printed boards to a series of hightemperature excursions from ambient. The temperatureexcursions cause thermo-mechanical fatigue of the electricalinterconnect test coupon is resistance heated by passing DC currentthrough the coupon to bring the temperature of the copper toa designated temperature. Switching the current on and offcreates thermal cycles between room temperature and thedesignated temperature within the sample. The laminate andsurrounding materials are heated to different extents depend-ing on the thermal conductivity of the materials. The thermalcycling can accelerate latent interconnect anomalies to number of cycles achieved permits a quantitative assess-ment of the Method A DescriptionMethod A uses a coupon withtwo or more independent electrical nets. The designation forthese nets is either a power net (P) or a sense net (S). Eachelectrical net consists of plated barrels and conductors (inter-nal and external).
IPC-TM-650 TEST METHODS MANUAL Number 2.6.26 Subject DC Current Induced Thermal Cycling Test Date 5/14 Revision A Originating Task Group PTV Reliability Test Methods (6-10c) Material in this Test Methods Manual was voluntarily established by Technical Committees of IPC. This material is advisory only and its use or adaptation is entirely voluntary.
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