JEDEC 2018 PIND Testing of UB Devices



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  • INTRODUCTION:  The “UB” packages are one of the smallest devices ever subjected to the PIND test.  These devices measure just 0.12″L x 0.10″W x 0.05″H with an internal cavity of about 0.015″ resulting in a PIND test at >130Hz (per MIL-STD formula).  Due to their small architecture and miniscule cavity it can be daunting to find loose particles inside.
  • Three questions were posed:
  • 1.  What is the optimal vibration frequency?  About 130Hz
  • 2.  Does increased mechanical shock improve detection?  No
  • 3.  Does simultaneous mechanical shock improve detection?  Yes
  • Synopsys of Testing
  • 24 each of the UB packages were subjected to PIND test from 80-150Hz vibration at 10Hz intervals.  The 24 UB packages were divided in to two groups, one group of 12 were tested in ascending frequency and 12 in descending frequency.  After 3 runs (testing at 3 different frequencies) the packages were allowed to rest under an ionizing fan for 18 hours.  None of the devices showed a change in Pass/Fail of PIND.  The number of packages tested was reduced to 10, 5 Fails (with low particle noise) and 5 Pass (no particle noise).  All 10 devices were shocked at >5000Gs @ 0.1msec and randomized.  The 10 packages were retested at 130Hz (highest voltage vs. frequency) with simultaneous shock and again with non-simultaneous shock.  The simultaneous shock had 5 detections (1 below threshold) the non-simultaneous shock had only 3 detections.
  • Note:  A competing PIND manufacturer claims a longer shock pulse without simultaneous vibration improves detection.  This claim has been proven false by the NBS in 1978 and again in 2018 by B&W.  Newton’s 1st Law is still valid!