SFM-143-L2-LM-D-A-K SAMTEC Connector (Other) In Stock
The SFM-143-L2-LM-D-A-K is an 86-position, dual-row, 0.050" pitch high-reliability surface mount socket strip from Samtec providing 172 total contacts. Designed for demanding mezzanine and module interconnect applications, it features low-mating-force (LM) contacts and polarization keying. Available in stock with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 86
- Lifecycle
- ACTIVE
- Datasheet
- SFM-143-L2-LM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 86-position dual-row layout at 0.050" (1.27 mm) pitch provides 172 contacts in a compact SMT footprint
- Low-mating-force (LM) contact design minimizes insertion force on high-density fine-pitch mating cycles
- Polarization keying (K) prevents connector misorientation during module insertion in high-reliability assemblies
Applications
The SFM-143-L2-LM-D-A-K is suited for FPGA mezzanine cards, high-speed signal processing modules, and ruggedized computing platforms where 172 contacts must interconnect reliably at a 0.050" pitch with minimal mating force. Its keyed polarization and low-mating-force design are especially valuable in field-replaceable module architectures where operators swap boards frequently, reducing the risk of bent contacts or reversed insertions across hundreds of mating cycles.
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
How does the low-mating-force design of the SFM-143-L2-LM-D-A-K affect field-replacement procedures on a 172-contact module?
The low-mating-force (LM) contact design of the SFM-143-L2-LM-D-A-K reduces the cumulative insertion force across all 172 contacts, which on a standard fine-pitch strip could otherwise exceed 5 to 10 pounds of required seating force. Lower insertion force decreases the risk of PCB flex-induced pad delamination during field module swaps, and it allows technicians to seat and unseat boards with one hand rather than requiring a tool or two-hand grip.
What role does polarization keying play on the SFM-143-L2-LM-D-A-K, and which application environments make it essential?
Polarization keying on the SFM-143-L2-LM-D-A-K physically prevents the mating module from being inserted in the wrong orientation across the 172-contact interface. This feature is essential in military electronics, avionics, and industrial automation where connectors are serviced under low-light or high-stress conditions and a reversed insertion could apply voltage to wrong pins, damaging devices rated at only 3.3 V or 5 V.
For a procurement team selecting between SFM-143-L2-LM-D-A-K and a comparable 86-position standard-force socket, what is the key trade-off in cost and service life?
The low-mating-force variant typically carries a small premium of 5% to 15% over a standard-force SFM-143 socket, but the extended contact life — typically 500 or more mating cycles at rated 0.050" pitch versus 30 to 50 cycles for standard-force fine-pitch strips — substantially reduces per-socket replacement cost over the lifetime of a test fixture or field-serviceable module platform.
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