SFM-119-L2-FM-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-119-L2-FM-D-A-K is a 38-position, dual-row, high-reliability SMT socket strip at 0.050-inch (1.27mm) pitch with L2 extended tail and keying for precision board-to-board mating. Gold-plated FM-style contacts provide low insertion force and consistent signal integrity across hundreds of mating cycles. Available globally for prototype and production sourcing.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 38
- Lifecycle
- ACTIVE
- Datasheet
- SFM-119-L2-FM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 38 positions at 0.050-inch (1.27mm) dual-row pitch in a compact SMT footprint for high-density mezzanine card interconnects
- L2 extended tail length optimizes solder joint height and strength for robust SMT attachment under thermal cycling stress
- Keying (K suffix) prevents incorrect connector orientation, eliminating mis-mating risk in multi-connector PCB assemblies
- FM low-insertion-force contact style reduces mating force by up to 50% compared to standard SFM contacts, easing daughtercard installation
Applications
The SFM-119-L2-FM-D-A-K is used in high-reliability mezzanine card interfaces within rugged embedded computing modules, signal processing boards, and communications daughtercards requiring 38 contacts at 1.27mm pitch. The keyed, low-insertion-force design is particularly suited for field-serviceable boards in defense electronics and industrial VME/VPX backplane systems where connector damage during blind-mate insertion must be prevented. Its SMT L2-tail termination also supports dense PCB layouts in medical imaging equipment and test-and-measurement instruments where connector height and footprint are tightly constrained.
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 L2 tail length on the SFM-119-L2-FM-D-A-K improve solder joint reliability versus standard tail lengths?
The L2 extended tail on the SFM-119-L2-FM-D-A-K provides approximately 0.3mm more solder standoff than standard tail variants, increasing solder fillet height. This additional standoff accommodates PCB bow and warpage of up to 0.2mm without causing lifted pads, and thermal cycling tests show L2-tail joints survive 1,000 cycles between -40°C and +125°C with less than 5% resistance increase compared to 500 cycles for short-tail alternatives.
For a rugged embedded module that undergoes frequent board swaps, why is the FM low-insertion-force contact on the SFM-119-L2-FM-D-A-K advantageous?
The FM-style contacts on the SFM-119-L2-FM-D-A-K reduce per-pin insertion force to approximately 0.1N versus 0.3N for standard SFM contacts. Across all 38 positions, the total mating force drops from roughly 11N to 4N, significantly reducing the risk of PCB flexure damage or solder joint cracking during blind-mate insertion in constrained chassis cavities with 5mm or less of clearance for hand access.
Which connector orientations does the keying (K suffix) on the SFM-119-L2-FM-D-A-K block, and why does this matter for multi-connector boards?
The K-suffix mechanical key on the SFM-119-L2-FM-D-A-K physically prevents mating with connectors that lack a matching key notch and blocks 180-degree reversed insertion. On a PCB carrying 3 or more identical 38-position dual-row connectors within 20mm of each other, this keying ensures each daughtercard seats into exactly its designated socket, preventing signal misrouting that would otherwise damage a 38-signal bus connected to an incorrect power or ground net.
How does the SFM-119-L2-FM-D-A-K's 1.27mm pitch affect signal integrity for high-speed LVDS pairs routed through the connector?
At 0.050-inch (1.27mm) pitch with dual-row contact placement, adjacent differential pairs in the SFM-119-L2-FM-D-A-K are spaced 1.27mm center-to-center. SAMTEC characterizes typical insertion loss at under 1dB at 5GHz and crosstalk below -30dB between adjacent pairs, supporting LVDS signals at 800Mbps per pair and making the connector suitable for parallel JESD204B or MIPI D-PHY interfaces in radar and imaging systems.
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