SFM-149-L2-STL-D-A-P SAMTEC Connector (Other) In Stock
SAMTEC SFM-149-L2-STL-D-A-P is a 98-position dual-row high-reliability surface mount socket strip with 1.27 mm (0.050 inch) pitch and straddle mount termination. Designed for high pin-count PCB edge-mount and mezzanine interconnects. Available from stock with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 98
- Lifecycle
- ACTIVE
- Datasheet
- SFM-149-L2-STL-D-A-P Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SFM-149-L2-STL-D-A-P?
- 98-position dual-row fine-pitch socket at 1.27 mm (0.050 inch) pitch for very high pin-count mezzanine and edge-mount PCB connections
- Straddle mount (STL) termination solders to both top and bottom PCB surfaces for dual-sided mechanical and electrical retention
- High reliability (H) contact rating designed for extended service life across repeated mating cycles in demanding environments
- Accepts mating headers with A-style (through-hole) pin termination for flexible board-to-board stacking configurations
What is SFM-149-L2-STL-D-A-P used for?
The SFM-149-L2-STL-D-A-P is designed for very high pin-count mezzanine and PCB edge-mount interconnect applications in FPGA boards, multi-channel data acquisition systems, and high-performance embedded computing modules requiring 98 reliable contacts at fine 1.27 mm pitch. Its straddle mount design attaches to the PCB edge, enabling direct board-to-board connections without additional height-adding hardware, which is critical in compact stacked system architectures. The dual-row socket layout accommodates complex mixed signal, power, and ground assignments across all 98 positions.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the SFM-149-L2-STL-D-A-P datasheet?
SFM-149-L2-STL-D-A-P Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for SFM-149-L2-STL-D-A-P?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the straddle mount (STL) termination of SFM-149-L2-STL-D-A-P compare to standard bottom-mount SMT sockets in edge-mount PCB applications?
Straddle mount (STL) termination places contact tails on both the top and bottom surfaces of the PCB edge, providing solder joints on 2 sides rather than just the bottom, which increases the total solder joint area by approximately 2x compared to standard bottom-mount SMT sockets. This dual-sided attachment improves resistance to peel forces perpendicular to the board edge, making it more reliable in systems subject to vibration or repeated connector mating at the board edge.
For a 98-pin FPGA daughter card, what PCB routing constraints does the 1.27 mm pitch of SFM-149-L2-STL-D-A-P impose?
At 1.27 mm (0.050 inch) pitch with 49 positions per row, the connector occupies approximately 61 mm of PCB edge length (49 × 1.27 mm). PCB routing for 98 differential or single-ended signals at this pitch requires trace widths below 0.1 mm and via sizes below 0.3 mm diameter to escape the fan-out area, which necessitates HDI (High Density Interconnect) PCB fabrication with at least 4-mil line and space design rules for reliable signal routing.
In what ways does the 98-position count of SFM-149-L2-STL-D-A-P serve high-performance embedded computing differently than a 22-position variant like SFM-111?
The 98-position SFM-149-L2-STL-D-A-P supports interfaces requiring large numbers of simultaneous signal lanes, such as 32-bit or 64-bit parallel buses, multiple LVDS pairs, or combined signal and power planes on a single connector. The 22-position SFM-111 is limited to 22 contacts, restricting it to narrow-bus or low pin-count interfaces. FPGA boards with 32 or more I/O pins assigned to a single mezzanine connector require the higher position count of the SFM-149 to avoid splitting the interface across multiple connectors.
What mating header pin termination style does SFM-149-L2-STL-D-A-P accept and how does this affect PCB stacking height?
The SFM-149-L2-STL-D-A-P accepts mating headers with A-style through-hole pin termination, which allows the mating header to be pressed or soldered into a through-hole PCB footprint on the carrier board. The stacking height between the two mated boards is determined by the header post length above the carrier board surface and the socket housing height, typically resulting in board-to-board separations ranging from 4 mm to 15 mm depending on the specific mating header selected from the SAMTEC SHF or LSHM series.
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