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
-
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- Outdated information (April 2013)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
- FMC filler panel (to close an unused FMC front-panel hole in the carrier front-panel)
- ELMA 21M602 (Not yet in catalogue, Oct.2019)
- Spacers
- CERN Stores: 06.61.91.313.1 (10 mm)
- Schroff: 60897-278
- 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- Example order 2 - CERN only* Outdated Samtech info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- Samtech old page with only FMC, may be outdated.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)
- We had a number rip off the board without particularly violent manipulation. (TL, 5/2017)
-
-
Amphenol SMA Right Angle PCB Jack,
through-hole
- Same size/footprint as LEMO. Therefore with the same mechanics and layout you could potentially mount one or the other as projects require. (5/2017)
- Not part of the survey from 2010.
- 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.
- 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.
- 20-pin connector
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
-
Avnet FMC
Extender
(not much data)
- Adds an additional 12 mm of mating height between an FPGA Carrier Card and an FMC Daughter Card.
- AVNET FM-PLPC FPGA Mezzanine Card Low Pin Count Functions Development Platform
- Faster Technology
-
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
-
HDR-169472-01, search - Low Pin Count extender cable
- was SCF-155382-02-MA, not available anymore
- CERN order 6882677
-
HDR-153514-01, search - High Pin Count extender cable
- CERN order 6881169
-
HDR-169472-01, search - Low Pin Count extender cable
-
Outdated Samtech info
-
Samtech old page with only
FMC, may be
outdated.
FMC Flex Datalinks - outdated
-
Samtech old page with only
FMC, may be
outdated.
-
- Kaya Instruments
- 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 this project.
FMC Usage notes
Erik van der Bij - 18 October 2022