FMC components and design tips
Mechanical FMC components
Front-panel kit
10mm height front-panel (default)
-
- 21M280-1 (10mm height): 1 bezel, 1 O-ring and 4 screws (cross). (Example order - CERN only)
- 21M280-2 (10mm height): 1 bezel, 1 O-ring, 2 10mm standoffs and 8 screws (cross).
- Possibility to make customised cut-outs and colour printing (Example order - CERN only)
-
Gompf Brackets
- "FMC-3-0000 - PMC and FMC Bezels" http://bracket.com/products/bezels.html
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XTech
-
FMC
components
- 125749 FMC Bezel- Aluminum Extrusion – with 10mm Leg; Includes O-ring, conductive elastomer, UL 94-V0 (kit of 10)
- Example order - CERN only
- CBT Technology is the new name of XTech.
- Outdated information (April 2013)
- XFM95-0001 REV-B KIT-10 (125749) = 10 bezels, 10 O-ring
gaskets, and 40 screws (no Standoffs).
- On-line order: part no. Sku #: 125749, single bezel, 1 O-ring gasket, 4 Screws. Note: Screws not specified, but are included, Standoffs are not included.
- XFM95-0001 REV-B = single bezel, 1 O-ring gasket, 8 Screws, 2 Standoffs.
- XFM95-0001 REV-B KIT-10 (125749) = 10 bezels, 10 O-ring
gaskets, and 40 screws (no Standoffs).
-
FMC
components
8.5mm height front-panel
-
XTech
- XFM95-0002 FMC mezzanine card front panel 8.5mm stack height. Includes a bezel, EMC rubber gasket and four board mounting screws.
- Example order - CERN only
- CBT Technology is the new name of XTech.
Separate elements
- Spacers
- Screws 2.5mm x 6mm (diameter x length)
- CERN Stores (Bossard): 1243896 - note: slit-type, does not match cross-type from Elma front-panel
- XTech
FMC Connectors
- Samtech (note: VITA 57 FMC is at the bottom of the page; the top shows VITA 42 XMC)
- Examples of orders (CERN only)
- Example order 1 - CERN only (pos.3, typo: is lpc, not hpc)
- Example order 2 - CERN only* Outdated Samtech info
- Example order 3 - CERN only
- Example order 4 - CERN only
- Samtech old page with only FMC, may be outdated.
The assembly of FMC connectors has proven to be critical. Please take the following suggestions into account.
- Soldering Process Improvement of Critical SMT Connectors and for the Retention of Press-fit SFP Cages, Tho Vu et al, IPC APEX EXPO Proceedings.
- Samtec suggests using a 6-mil solder stencil when assembling boards with the FMC connectors. Assembly of other components with fine geometry such as QFN packages may benefit from the more standard 5-mil solder stencil. In this case, Opal Kelly has had good success in expanding the FMC stencil apertures from their specified round aperture to a 0.037-inch square aperture with 0.003-inch rounded corners. The increase in paste application from aperture makes up for the reduced paste volume from the thinner stencil. (source: Opal Kelly Shuttle LX1 User’s Manual).
External connectors usable with 10mm FMC front-panel
- SMC high-frequency front-panel mount connectors (low enough for 10mm FMC cards)
- Example order - CERN only
-
Survey of SMA, SMC and MMCX connectors for the use on FMC
cards
(in French, March 2010)
-
SMA in surface mounting: see also Emerson 142-0711-301
- As an SMD connector one can damage the board if so much torque is applied. To solve one may put a hole between them to allow to put a kind of metal strip on top of connectors and screening on the board. It can help in the robustness. (Fernando Henrique Cardoso, LNLS/CNPEM, June 2013)
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- Comparison between SMC and LEMO 00 connectors
- Multi-pin connector
- Multi-pin Connectors for use on FMC front panels - "Large style connectors"
- micro HDMI Type D
- Example of use in FMCADC2M18b2chDAC500k20b1ch and SVEC
- Molex 46765-1001 and others
- Note that cable assemblies with micro HDMI on both sides are
difficult to get
- Lindy (France)
- Molex does not have micro HDMI on both sides.
PCIe front-panel with FMC cutout
The PCI express boards designed as part of the OHR project need a specific front-panel with a cutout for the FMC carrier's front panel.
-
Gompf Brackets - Three-piece design,
retained solution.
- Part # 3200‐0479
- Example order - CERN only
- Purcell Brackets - One-piece design
- Screws 3mm x 5mm (diameter x length)
- CERN Stores (Bossard): 1244051
FMC debugging tools
-
Samtech (note: VITA 57
FMC is at the bottom of the page; the top shows VITA 42 XMC)
- SEARAY
™ VITA 57 Connectors - Standard Recommended FMC HDR Cable Assemblies
- Outdated Samtech info
-
Samtech old page with only
FMC, may be
outdated.
FMC Flex Datalinks - outdated- Example: SCF-155382-02-MA (alternative supposedly HDR-169472-01)
-
Samtech old page with only
FMC, may be
outdated.
- SEARAY
- TEWS Technologies
- Xilinx
FMC schematic and PCB symbols
FMC connector symbols for Altium (in Pcb and sch libraries) can be found in the files section of various projects:
- LPC mezzanine connector in the FMC-TDC project
- HPC mezzanine connector in the FMC-ADC_100M14v4cha project
- LPC carrier connector in the SPEC project
FMC Usage notes
Erik van der Bij - 9 December 2013