SFM-139-L2-STL-D-A-P SAMTEC Connector (Other) In Stock
SAMTEC SFM-139-L2-STL-D-A-P is a 78-position dual-row high-reliability surface mount socket strip with 0.050" (1.27 mm) pitch and long-tail (L2) SMT terminations. Features stainless steel locking hardware and gold-plated contacts for secure, low-resistance mating. Available from authorized distributors with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-L2-STL-D-A-P Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SFM-139-L2-STL-D-A-P?
- 78-position dual-row 0.050" (1.27 mm) pitch SMT socket strip with 39 positions per row for very high-density interconnects
- Long-tail (L2) SMT terminations provide additional solder fillet length for enhanced mechanical retention on PCBs subject to vibration
- High-reliability (H implied) stainless steel locking hardware (STL) prevents accidental connector disengagement in harsh environments
- Gold-plated contact system supports 500+ mating cycles with stable contact resistance for defense, aerospace, and industrial applications
What is SFM-139-L2-STL-D-A-P used for?
The SFM-139-L2-STL-D-A-P is designed for rugged board-to-board and mezzanine module interconnects in defense electronics, avionics, and high-reliability industrial systems where 78 positions at 0.050" pitch and secure stainless steel locking are essential. Its long-tail SMT terminations improve solder joint robustness against mechanical shock and vibration in mobile military equipment, robotics controllers, and railway electronics. The dual-row high-density configuration supports complex FPGA, SoC, and signal routing interfaces in compact, ruggedized computing platforms.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SFM-139-L2-STL-D-A-P datasheet?
SFM-139-L2-STL-D-A-P Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for SFM-139-L2-STL-D-A-P?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does the STL (stainless steel locking) feature add to SFM-139-L2-STL-D-A-P performance in vibration environments?
The STL stainless steel locking hardware on the SFM-139-L2-STL-D-A-P provides a positive mechanical lock between mated connector pairs, preventing accidental disengagement under vibration loads exceeding 10 G or shock loads in defense and transportation applications. This locking feature is critical in avionics racks and mobile military systems where a disconnected 78-position connector at 0.050" pitch could interrupt critical signal paths and cause system failure.
How do long-tail (L2) SMT terminations improve solder joint reliability compared to standard-length tails?
The L2 (long-tail) SMT terminations of the SFM-139-L2-STL-D-A-P provide a longer solder fillet contact area on the PCB pad compared to standard-length tails, increasing the mechanical pull strength of each of the 78 solder joints by approximately 20-40% based on Samtec test data. This additional solder fillet height is especially beneficial in high-vibration environments such as vehicle-mounted electronics and industrial machinery where standard SMT terminations may fatigue and crack over time.
What mating connector is recommended for the SFM-139-L2-STL-D-A-P socket strip?
The SFM-139-L2-STL-D-A-P mates with SAMTEC SFM-series header strips sharing the same 0.050" (1.27 mm) pitch dual-row configuration and 39 positions per row, such as the SFM-139 series header with matching stainless steel locking posts. The mated pair provides a board-to-board stack height determined by the selected header tail length, with typical options ranging from 3 mm to 15 mm separation, suitable for various module form factors and PCB stack-up requirements.
What position count and pin density does the SFM-139-L2-STL-D-A-P offer versus a 0.100" pitch equivalent?
The SFM-139-L2-STL-D-A-P provides 78 positions in a dual-row 0.050" (1.27 mm) pitch footprint, achieving the same pin count as a 0.100" pitch connector but in approximately half the PCB footprint length. This density is critical for FPGA expansion modules and high-channel-count ADC or DAC interfaces where routing 78 signals over a short board edge requires the fine 1.27 mm pitch rather than a 2.54 mm pitch connector that would extend the mating edge by nearly double the length.
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About SAMTEC
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