SFM-137-L2-LM-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-137-L2-LM-D-A-K is a 74-position dual-row high-reliability surface-mount socket strip at 0.050" (1.27 mm) pitch with gold-over-nickel contacts rated at 1 A per pin and integrated locating posts. Operating range -55°C to +125°C. In stock worldwide with fast shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 74
- Lifecycle
- ACTIVE
- Datasheet
- SFM-137-L2-LM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 74-position dual-row SMT socket strip on 0.050" (1.27 mm) pitch enabling compact high-density mezzanine and daughter card board-to-board interconnects
- Integrated locating posts (-K suffix) for precise PCB-to-PCB registration during reflow soldering, minimizing co-planarity errors in dense SMT assemblies
- Gold-over-nickel contact finish rated at 1 A per pin with -55°C to +125°C operating range for industrial and aerospace reliability requirements
Applications
The SFM-137-L2-LM-D-A-K is suited for mezzanine board-stacking applications in embedded computing, FPGA expansion cards, and industrial I/O modules where 74 dual-row contacts at 0.050" pitch provide a dense signal and power interface. The -K locating post feature ensures accurate alignment during automated SMT assembly, making it particularly effective in high-volume production of SBC expansion boards, network interface cards, and rugged computing platforms.
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 contact count and pitch of the SFM-137-L2-LM-D-A-K, and what per-pin current is allowed?
The SFM-137-L2-LM-D-A-K provides 74 positions in a dual-row layout at 0.050" (1.27 mm) pitch, with each contact rated at 1 A continuous current. Across the full 74 pins this yields up to 37 A of total distributed current capacity, supporting mixed signal and local power supply rails on FPGA mezzanine cards and industrial I/O expansion modules.
For a high-volume SMT production line, how do the locating posts on the SFM-137-L2-LM-D-A-K reduce assembly defects?
The -K suffix designates integrated locating posts that insert into corresponding holes on the mating PCB before and during reflow, mechanically constraining the connector to within 0.1 mm of nominal position. This prevents the tombstoning and co-planarity drift that can occur when a 74-position surface-mount connector is placed on a solder paste deposit and then conveyed through a reflow oven, reducing solder bridging defects between the 1.27 mm pitch contacts and improving first-pass yield in automated PCB assembly.
How does the 0.050" pitch SFM-137-L2-LM-D-A-K compare to a 0.100" dual-row socket strip in a space-constrained embedded SBC design?
At 0.050" (1.27 mm) pitch, the 74-position SFM-137-L2-LM-D-A-K occupies a contact row length of approximately 47 mm, versus approximately 95 mm for a 0.100" (2.54 mm) pitch equivalent. This nearly 50% length reduction frees substantial PCB area for components on the daughter card or motherboard, making the SFM-137 the preferred choice for single-board computers and FPGA expansion cards where connector footprint directly competes with processor, memory, and power stage placement.
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