SFM-139-L2-LM-D-A-K SAMTEC Connector (Other) In Stock
The SFM-139-L2-LM-D-A-K is a high-reliability dual-row socket strip from SAMTEC featuring 78 positions on a 0.050-inch (1.27 mm) pitch, designed for surface-mount assembly in demanding board-to-board interconnect applications.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-L2-LM-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 layout on a compact 0.050-inch (1.27 mm) pitch for high-density board-to-board connections
- High-reliability surface-mount termination rated for demanding industrial and defense applications
- SAMTEC SFM series design provides low-insertion-force mating with compatible SFM header strips
Applications
The SFM-139-L2-LM-D-A-K is used in high-density PCB mezzanine stacking applications where 78 signal or power contacts must be routed in a minimal footprint at 0.050-inch pitch. It suits defense electronics, high-speed data acquisition boards, and industrial backplane systems that require reliable surface-mount socket connectivity. The dual-row format maximizes pin count per unit length, making it a strong choice for FPGA daughter-card and modular instrument designs.
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 is the pin count and pitch of the SFM-139-L2-LM-D-A-K connector?
The SFM-139-L2-LM-D-A-K has 78 positions arranged in a dual-row configuration on a 0.050-inch (1.27 mm) pitch. This compact geometry supports high signal density per unit board area and is compatible with SAMTEC SFM-series mating headers.
In which assembly process can SFM-139-L2-LM-D-A-K be used, and what does that mean for PCB manufacturing?
The connector is surface-mount terminated, so it can be placed by automated pick-and-place equipment and reflowed in standard SMT ovens. This eliminates through-hole drilling, enabling denser multi-layer board layouts and reducing assembly cycle time for production volumes.
What applications benefit most from the 78-position dual-row SFM-139-L2-LM-D-A-K versus a lower pin-count alternative?
Applications needing more than 50 signal lines in a constrained board area—such as FPGA mezzanine cards, high-speed data acquisition modules, and defense electronics backplanes—benefit from the 78-pin dual-row SFM-139-L2-LM-D-A-K. Its 0.050-inch pitch packs 78 contacts into roughly 1.97 inches, avoiding larger connectors and saving significant PCB real estate.
Related Guides
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
0402 10uF X5R Decoupling Design Guide for Compact Digital Rails
Application note for using CL05A106MP5NUNC-class 0402 10uF X5R MLCCs in compact digital rail decoupling designs.
Jun 19, 2026
How to Choose an 0805 10uF MLCC for Decoupling and Bulk Capacitance
Selection guide for choosing 0805 10uF MLCCs around CL21A106KOQNNNE, covering derating, dielectric, package, and sourcing checks.
Jun 19, 2026
Why Buy from FindMyChip
About SAMTEC
SAMTEC is a leading electronic component manufacturer. FindMyChip sources SAMTEC ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”