SFM-139-L2-F-D-A-K SAMTEC Connector (Other) In Stock
The SFM-139-L2-F-D-A-K is a 78-position, dual-row high-reliability surface-mount socket strip from SAMTEC with 0.050" (1.27 mm) pitch for fine-pitch mezzanine interconnects. It features gold-plated contacts rated at 1A per pin and a surface-mount footprint for automated SMT assembly. In stock worldwide for compact high-density applications.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-L2-F-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 78-position dual-row configuration at 0.050" (1.27 mm) pitch delivering high-density fine-pitch board-stacking capability
- High-reliability gold-plated contacts rated 1A per pin with beryllium copper springs for long-term mechanical and electrical stability
- L2 standoff and K locking peg options provide precise board-to-board spacing and anti-vibration retention in rugged environments
Applications
The SFM-139-L2-F-D-A-K is used in high-density mezzanine stacking applications such as FPGA daughter cards, RF front-end modules, and embedded processor expansion boards where 78 fine-pitch signals must be reliably routed between PCB layers. Its L2 standoff feature provides defined 2mm board-to-board clearance, making it suitable for ruggedized military, aerospace, and industrial computing designs with strict mechanical tolerances. The locking K peg variant ensures vibration-resistant engagement in mobile and vehicular electronics environments.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What board-to-board standoff height does the L2 designation specify in SFM-139-L2-F-D-A-K?
The L2 designation in SFM-139-L2-F-D-A-K specifies a 2mm board-to-board mating height, defining the gap between the two stacked PCBs. This fixed 2mm clearance is critical for thermal management, component height clearance, and mechanical stiffness in rugged embedded systems where vibration and shock loads are applied across the stacked board assembly.
How many positions and at what pitch does SFM-139-L2-F-D-A-K route signals across the mezzanine interface?
The SFM-139-L2-F-D-A-K is a 78-position dual-row connector with a 0.050" (1.27 mm) pitch, providing 78 individual signal or power paths between mated PCBs. At 1A per pin rating, this connector can simultaneously carry mixed signal and power rails across the same 78-pin interface, supporting complex SoC or FPGA I/O expansion in a footprint under 50mm in length.
What retention mechanism does the K locking peg in SFM-139-L2-F-D-A-K provide for vibration environments?
The K locking peg on SFM-139-L2-F-D-A-K is a molded polarization and retention feature that locks the mated connector pair together, resisting accidental de-mating under vibration and shock. It mates with a corresponding hole on the header connector, providing mechanical polarization to prevent mis-insertion and additional axial retention force beyond what the 78 gold-plated spring contacts alone provide.
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