DOM Electronic Reliability Progress Report S.Colonges 09/04/2014

Progress Report Board analyzed: BoardFIT analysisDerating analysis FMECARemarks CLB V2Fides 2004 / Fides 2009 No (TBD)Organization?Cerramic capacitors Octopus (large)Fides 2009Yes (without connectors…) Organization?Connectors Octopus (small)Fides 2009IdemOrganization?Connectors BaseFides 2009YesOrganization?Capacitors ASICS Power BoardFides 2009No (TBD)Organization?Derating problems. Mechanical problems

Octopus small Board PCA9548  higher FIT  Temperature elevation TBC Failure risk (15 years)  F(t) = 1 – e - t  6,4% Connectors: -Screw lock small connectors -Mechanical connector reliability -Mechanical weakness point on Molex edge

Octopus large Board -PCA9548  higher FIT  Temperature elevation TBC Failure risk (15 years)  F(t) = 1 – e - t  6,4% Connectors: -Screw lock small connectors -Mechanical connector reliability -Mechanical weakness point on Molex edge

Base Failure risk (15 years)  F(t) = 1 – e - t  26% -Capacitors  change rating (case) for higher contributors ? (case 1206 /100 nF higher contributor) -Degraded modes  number of PMT fails allowed / DOM? - ASIC ESS  TBC

Power Board Failure risk (15 years)  F(t) = 1 – e - t  75,7% -Derating  A lot of capacitors overrated!  Change design  new derating analysis -CEM analysis? (inductors shielding?) -Mechanical weakness for DC/DC converters modules

CLB V2 Failure risk (15 years)  F(t) = 1 – e - t  26,9% -Derating  capacitors (22µF, 100µF and 4,7µF)  Change design?  new derating analysis  Connectors  mechanical weakness point

Global results -Failure probability (15 years) for the whole DOM  88,4% with PBV2  52,7% without PBV2

Results update Accelerating parameters:  Process, application, ruggedizing Derating analysis update FMECA  degraded modes? (failure effects) / FDIR Reports

Open questions Stress screening / ESS Connectors  integration procedure / vibrating qualification? Fixing? Prototypes tests reports

More slides…

Base

Octopus small Board

Octopus large Board

CLB V2 Board