TAS’ Experience with AEC Devices in Launcher Applications

Agenda

INTRODUCTION: WHY AEC FOR LAUNCHERS

ARIANE-6: A6-GR-1000000-X-32-ASL Issue 1 EEE Components & Assembly technologies policy
- Ariane-5 Large Heritage with AEC-Q devices. Field Return: No failures
- AEC-Q devices meet A6 requirements on Components Reliability Data
- AEC-Q devices meet A6 requirements on whisker data
- No Total Ionisation Dose (TID) / Total Non Ionisation Dose (TNID) requirements for launchers but Single Event Effect: avoid non recoverable effects a LETth<35MeV*cm2/mg
- AEC-Q devices: Constructional Analysis as per ECSS-Q-ST-60-13C, and heavy ions testing as applicable
- RoHS & REACH required
- This policy is in line ECSS-Q-ST-60-13c Grade-3 except by ROHS & REACH and lack of TID/NITD
- EEE Components meeting Araine-6 requirements are classified in TAS Parts Common data Base as Grade-4 to segregate with other Grade-1/Grade-2/Grade-3 COTS as per ECSS-Q-ST-60-13C
VEGA-C : VG-SG-1-D-0032-SYS Iss.2 Rev.1 VEGA-C Launcher Vehicle EEE components’s policy
- Similar approach as Ariane-6 for the “Industrial procedure”.

SOME FIGURES FROM ARIANE-6: 70% AEC

TAS in Belgium Analysis :
- 4 Equipments: 596 line items (374 passives, 109 connectors, 113 actives). 407 are automotive ; 169 pure commercial ; 14 are PEDs (Plastic Enhanced Devices with Vendor Item Drawing); 6 are HiREL
- TASiB. 93 Justification documents prepared.
TASinSpain:
- 1 Single Equipment: 96 line items (including passive values), 73 types where 43 are AEC-Q, 7 are PEDs (with VID), 22 are pure commercial, and 1 is 883B.
- 54 Justification Documents prepared by TASiS, 13 reused from those prepared by TASiB.
Total:
- 67% components are AEC-Q. 70% including AEC+PED.

SUPPLIERS. THE KEY DECISION. TRACEABILITY & COUNTERFEIT

Define 2 or 3 preferred and authorized distributors (DIGI-KEY; MOUSER, FARNELL, ARROW, AVNET…)
Provide the complete list to distributor for PCN/PDN tracking
Clarify the needs to distributors:
- Traceability (Lot Date Code; assembly Lot, wafer Lot)
- 1-year old Lots
- Single Lot, Lot homogeneity
- Appropriate packaging
- Cannot accept non AEC-Q alternatives, different manufacturer alternative
- Counterfeit Controls(Visual, Fischerscope, Constructional Analysis / DPA…)
Problems with suppliers:
- Lead Times Very problematic for resistors and capacitors due to worldwide shortage. 2 or 3 sources recommended
- Difficulties with requirement on single lot, tracebility, etc.. For some distributors
- Very big minimum buys for some non preferred distributors
- Export License for PEDs and some high end AEC (ECCN 3A001a.2.c; 5A991b; 3A991b.1a, etc..)

CONTROL OF PCN/PDN. OBSOLESCENCE & LAST TIME BUY

Follow-up of PCN/PDN imply a very huge amount of work. Recommended to be centralised by a single company.
Follow-up of PCN is critical, along with Constructional Analysis and Incoming, for:
- Changes affecting radiation (die: mask number, diffusion site, second sources)
- Changes affecting mounting qualification (assembly construction techniques, materials, assembly site, second sources for materials or assembly)
- Reliability data
- Obsolescence, Last Time Buy
- Export Licernse
- Countrefeit Controls
Obsolescence / Last Time Buy :
- Although product life cycle of AEC-Q products are expected to be much longer than thiose of pure commercial, TASiS experienced 3 LTB in 2 years (2 of them AEC-Q) for `products with End of Life not expected before 2023.

AEC-Q MANUFACTURERS FEEDBACK: FROM THE VERY BAD TO THE VERY GOOD

Very big differences in the feedback and support from AEC-Q manufacturers
- from the VERY BAD: almost no answer, impossible to get reliability data, PPAP (Production Parts Approval Process), info on ESD, support from Constructional Analysis findings, etc..
- To the VERY GOOD: willing to provide reliability reports PPAP, support for application and failures, etc…
Recommended :
- Establish early communication channel with manufacturers
- Work preferably with manufacturers with better support

INCOMING OF AEC-Q DEVICES (VISUAL & XRF): NO FAILURES

1st LOT INCOMING :
- Visual Inspection: should follow JESD22-B101C (best standard, ESCC or MIL standard are not appropriate)
- Fischerscope Inspection on 2 pieces 2 points whatever finish (pure tin, SAC, ENEPIG, etc…):

No anomalies seen on AEC-Q devices but on commercial , custom magnetic, etc.

Findings were most cosmetic and in a fraction of per cent of devices: small chip-out, lead frame copper exposed, marks on terminations, etc..

CONSTRUCTIONAL ANALYSIS: DELAMINATIONS