SFM-149-T2-LM-D-A SAMTEC Connector (Other) In Stock
SAMTEC SFM-149-T2-LM-D-A is a 98-position dual-row high-reliability socket strip on a 1.27 mm / 0.050" pitch for surface-mount assembly. It features gold-plated contacts and locating pins for precise mezzanine board-to-board alignment. From $10.20 in stock worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 98
- Lifecycle
- ACTIVE
- Datasheet
- SFM-149-T2-LM-D-A Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 98 dual-row positions (2×49) on a 1.27 mm / 0.050" pitch, providing maximum signal density for mezzanine and module board-to-board stacking
- LM (locating and mounting) posts ensure precise alignment during SMT reflow, preventing skew across all 98 contact positions on high-density assemblies
- High-reliability gold-plated socket contacts rated for multiple mating cycles, supporting field-upgradeable mezzanine modules in compute and communications systems
Applications
The SFM-149-T2-LM-D-A is used in FPGA mezzanine card (FMC) assemblies, high-speed compute modules, and military-grade communication boards where 98 signals must connect across a 1.27 mm pitch board-to-board interface with precise alignment. Its locating posts and gold contacts make it the preferred socket for applications requiring repeatable mating accuracy across thermal cycling and vibration in avionics and embedded 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 pitch and position count does SFM-149-T2-LM-D-A support for board-to-board stacking?
The SFM-149-T2-LM-D-A provides 98 positions in 2 rows of 49 on a 1.27 mm / 0.050" pitch. This fine pitch maximizes signal density, routing nearly 100 signals through a connector footprint smaller than a 2.54 mm pitch 50-position equivalent, which is essential for high-speed interfaces on compact FPGA module designs.
What does the LM designation add to SFM-149-T2-LM-D-A and why does it matter for SMT assembly?
The LM designation specifies locating and mounting posts that register the socket precisely on the PCB pad pattern before and during solder reflow. Without these posts, thermal expansion during reflow can shift the connector by 0.1 mm to 0.2 mm, sufficient to misalign one or more of the 98 contacts. Locating posts hold position to within 0.05 mm, ensuring all contacts land on their target pads simultaneously.
How many mating cycles do the gold-plated contacts in SFM-149-T2-LM-D-A typically support?
SAMTEC SFM series socket contacts with gold plating are rated for a minimum of 100 mating cycles under standard test conditions, with typical performance exceeding 200 cycles. This allows field engineers to swap mezzanine modules during system upgrades or troubleshooting without degrading the 98 contact interfaces, making it practical for laboratory instruments and field-upgradeable defense electronics.
Which mezzanine header families mate with the SFM-149-T2-LM-D-A socket?
The SFM-149-T2-LM-D-A mates with SAMTEC's TSM and SSM dual-row header series on the same 1.27 mm / 0.050" pitch. Mated stacking heights typically range from 3.6 mm to 19.7 mm depending on the complementary header post length, giving system designers flexibility to set the exact board separation needed for component and thermal management clearance in multi-board assemblies.
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