SFM-139-T2-LM-D-LC SAMTEC Connector (Other) In Stock
The SAMTEC SFM-139-T2-LM-D-LC is a 78-position dual-row high-reliability surface-mount socket strip with 0.050-inch (1.27 mm) pitch. Its low-cost (LC) design and long-mount (LM) lead style make it an economical choice for dense mezzanine and daughter-card interconnects in cost-sensitive industrial and commercial designs.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-T2-LM-D-LC Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SFM-139-T2-LM-D-LC?
- 78 positions in dual-row layout with 0.050-inch (1.27 mm) pitch surface-mount termination
- Low-cost (LC) variant for cost-optimized commercial and industrial connector applications
- Long-mount (LM) lead style provides increased standoff height and improved solder joint access
- High-reliability dual-row socket design for robust board-to-board and mezzanine interconnects
- Surface-mount construction enables automated reflow soldering in standard SMT assembly lines
What is SFM-139-T2-LM-D-LC used for?
The SFM-139-T2-LM-D-LC is suited for cost-sensitive embedded computing, industrial control, and telecommunications applications that require 78-signal dual-row board-to-board connectivity at a 0.050-inch pitch. Its long-mount lead style provides additional standoff height for underfill or conformal coating access in demanding environments. The low-cost variant reduces per-unit connector spend without sacrificing the signal density advantages of Samtec's SFM socket strip platform.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SFM-139-T2-LM-D-LC datasheet?
SFM-139-T2-LM-D-LC Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for SFM-139-T2-LM-D-LC?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What distinguishes the LM (long-mount) lead option in SFM-139-T2-LM-D-LC from standard SFM variants?
The LM suffix specifies a long-mount lead style that increases the standoff height between the connector body and the PCB surface. For a 78-position, 0.050-inch pitch socket, this standoff gap is useful for conformal coating, underfill dispensing, or optical inspection access without compromising the solder joint on any of the 78 pins.
For a 78-signal dual-row mezzanine interface, how does the SFM-139-T2-LM-D-LC compare to a 100-mil pitch alternative?
The SFM-139-T2-LM-D-LC operates at 0.050-inch (1.27 mm) pitch, which is half the spacing of a 0.100-inch pitch connector. Routing 78 signals at 1.27 mm pitch requires approximately half the PCB board length compared to a 2.54 mm pitch dual-row header, freeing valuable board space in compact embedded designs.
Does the LC designation on SFM-139-T2-LM-D-LC affect its reliability for commercial industrial use?
The LC (low-cost) designation on the SFM-139-T2-LM-D-LC refers to a cost-optimized plating or housing specification rather than a reduction in structural integrity. The connector still provides reliable 78-pin dual-row surface-mount performance in commercial and light industrial environments where the full high-reliability specification of premium SFM variants is not required.
How many contacts per row does SFM-139-T2-LM-D-LC have, and what PCB grid pattern does it fit?
With 78 total contacts in a dual-row arrangement, the SFM-139-T2-LM-D-LC provides 39 contacts per row spaced at 0.050-inch (1.27 mm) intervals. This aligns directly with standard 1.27 mm grid PCB layouts widely used in high-density embedded and communications module designs, simplifying PCB footprint reuse across product families.
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