SMT007 Magazine

SMT-Nov2016

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66 SMT Magazine • November 2016 Test 2: 4-hour bake @ 150°C + 3X Pb-free reflow: Conclusion All coupons within all three test groups passed to 1,000 hours of IST testing. I was hop- ing to make a big splash but unfortunately the data doesn't support it. Effectively, boards built to IPC Class 3 specifications seemingly do not require pre-baking. But what about boards built to Class 2 spec- ifications? IPC Class 2 PCBs make up the vast majority of PCB designs. Our next step will be to duplicate this experiment using test vehicles plated to IPC Class 2 standards. If you are inter- ested in receiving the results of this next test, please contact me. SMT Reference 1. Further information on IST testing can be found here. I also found this nice write-up by Polar Instruments. Yash Sutariya holds management positions at Saturn Electronics Corporation and Saturn Flex Systems Inc. To contact the author, click here. TO BAKE OR NOT TO BAKE Test 3: As is, 3X Pb-free reflow after receipt:

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