The OM Thermal Stress System is an cost-effective performance based reliability test methodology which performs both convection reflow assembly simulation (IPC TM-650 2.6.27A) and air-to-air thermal cycling (IPC TM-650 2.6.7.2).  The methodology is utilized by both the IPC PCQR² and the IPC 6012-QML programs.  Applications include product acceptance, supplier qualification, design validation, material studies, and process verification.  OM systems are available for sale and test services are provided by CAT and our service partners.


OM Advantages

  • Coupon configurations
    • 24 IPC-2221B Appendix A type D
    • HATS, custom and non-electrical
  • Data Acquisition
    • 4-wire precision resistance
    • 1 reading/net every second during reflow simulation
    • 1 reading/net after hot side dwell during thermal cycling
  • Software
    • Automatic data analysis and report generation
    • Simple temperature profile generation
    • In situ calibration using external temperature standard
  • Web based IPC D coupon generator
  • Press-fit headers
    • No soldering or cleaning required


OM System


Example Reflow Simulation Data


Example Thermal Cycling Data


Recommended Product Acceptance Drawing Notes

Product board acceptance based on coupon performance, also know as performance based acceptance testing.  Example drawing notes for reflow simulation and thermal cycling:

XX. IPC D COUPON TESTING

A.  IPC D COUPONS SHALL BE DESIGNED USING THE COUPON GENERATOR AT WWW.CAT-TEST.INFO.  COUPONS SHALL INCLUDE COMPONENT (A), VIA (B) AND ALL PROPAGATED B STRUCTURES IAW IPC-2221B APPENDIX A.  TWO (2) OF EACH COUPON DESIGN SHALL BE TESTED PER MANUFACTURING PANEL.

B.  THE IPC D COUPONS SHALL BE SUBJECTED TO 6 REFLOW SIMULATIONS IAW IPC-TM-650, METHOD 2.6.27A USING THE 230C PROFILE.  ACCEPTANCE CRITERIA SHALL BE <5% CHANGE IN RESISTANCE.

C.  AFTER REFLOW SIMULATION THE IPC D COUPONS WITH VIAS HAVING AN ASPECT RATIO > 8:1 SHALL BE SUBJECTED TO 100 THERMAL CYCLES IAW IPC-TM-650, METHOD 2.6.7.2 FROM 35C TO (TG -10C) OF THE LAMINATE MATERIAL.  ACCEPTANCE CRITERIA SHALL BE <10% CHANGE IN RESISTANCE.

D.  RESULTS FROM ALL COUPONS TESTED SHALL BE REPORTED.

Note:  Parameters in green should be tailored to each application.


Service Partners

                                    


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