SFM-144-L2-LM-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-144-L2-LM-D-A-K is an 88-position dual-row high-reliability surface mount socket strip at 0.050-inch pitch with low-profile LM board lock. Designed for dense mezzanine and daughter-card board-to-board interconnect. Available from distributor stock with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 88
- Lifecycle
- ACTIVE
- Datasheet
- SFM-144-L2-LM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 88-position dual-row 0.050-inch pitch socket strip with LM low-profile board lock providing secure mechanical PCB retention without increasing connector height
- High-reliability Tiger Eye contact technology maintaining contact resistance below 20 mΩ per pin across a minimum of 100 mating cycles
- L2 tail length optimized for standard surface mount PCB pad geometry, ensuring full solder joint coverage during reflow at 260°C peak temperature
Applications
The SFM-144-L2-LM-D-A-K is used in high-density FPGA expansion boards, data storage controller cards, and defense electronics requiring reliable 88-pin mezzanine interconnect at 0.050-inch pitch. Its low-profile board lock (LM) feature is especially valuable in low-clearance sandwich stack PCB architectures where standard locking pegs would interfere with adjacent components. The dual-row surface mount format supports automated pick-and-place assembly and reflow soldering in high-volume telecommunications and industrial control production.
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 does the LM board lock designation mean for the SFM-144-L2-LM-D-A-K, and how does it differ from a standard board lock?
The LM designation in the SFM-144-L2-LM-D-A-K indicates a low-profile mechanical board lock feature that anchors the connector body to the PCB without adding significant height above the solder tails. Standard board locks may protrude 1 mm to 2 mm below the PCB surface or add height that creates clearance problems in tight sandwich stack configurations. The LM low-profile lock provides equivalent pull-off force resistance to standard locks while keeping the connector within a reduced-height PCB stack budget of typically under 3 mm board-to-board clearance.
How many positions per row does the SFM-144-L2-LM-D-A-K provide, and what PCB length does the connector body occupy?
The SFM-144-L2-LM-D-A-K provides 88 total positions in a dual-row layout at 0.050-inch (1.27 mm) pitch, giving 44 contacts per row. At 1.27 mm pitch per position row with 44 positions, the connector body spans approximately 55.9 mm (2.200 inches) along the row axis. This length makes it one of the larger connectors in the SAMTEC SFM surface mount socket strip family and must be accommodated in the PCB component placement zone with adequate routing keepout on adjacent signal layers.
Is the SFM-144-L2-LM-D-A-K appropriate for high-frequency differential signal routing at speeds above 1 Gbps?
The SAMTEC SFM series at 0.050-inch pitch is characterized for signal integrity performance, with individual contacts showing insertion loss below 1 dB up to approximately 3 GHz in matched differential pairs. For signals above 1 Gbps with tight eye-opening requirements, engineers should review SAMTEC's published S-parameter models for the SFM series and simulate the differential pair routing through the connector. At 2.5 Gbps SERDES rates, the SFM connector typically meets eye mask requirements when pair-to-pair skew is managed by matched PCB trace length routing within ±5 mil.
When is SFM-144-L2-LM-D-A-K a better choice than the SFM-146 with 92 positions for a specific FPGA I/O budget?
Choose the SFM-144-L2-LM-D-A-K with 88 positions when the FPGA I/O bank or daughter card pin budget is 88 signals or fewer, because using the smaller connector eliminates 4 unused positions per row and reduces the connector body length by approximately 5 mm compared to the SFM-146 92-position variant. The shorter connector improves PCB space utilization and reduces cost when the full 92-pin count of the SFM-146 is not required. If future board revisions may expand I/O requirements to 92 pins, the SFM-146 provides an upgrade path without changing the connector family footprint.
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