SFM-123-02-FM-D-A-K SAMTEC Connector (Other) In Stock
Samtec SFM-123-02-FM-D-A-K is a 46-position dual-row high-reliability SMT socket strip with 0.050" (1.27 mm) pitch and flush-mount (FM) body for low-profile board-to-board interconnects. Designed for high-density embedded and telecom modules requiring compact, reliable mating. Available from authorized distributors with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 46
- Lifecycle
- ACTIVE
- Datasheet
- SFM-123-02-FM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 46-position dual-row configuration at 0.050" (1.27 mm) pitch enabling very high signal density in compact SMT footprints
- Flush-mount (FM) body option providing a lower profile above the PCB surface for height-constrained board-to-board stack designs
- High-reliability construction rated for industrial operating temperatures from -55°C to +125°C
- K (key) polarization option preventing incorrect connector orientation and accidental mis-mating in dense multi-connector assemblies
Applications
The SFM-123-02-FM-D-A-K targets high-density board-to-board signal interconnects in FPGA module carriers, embedded SoM designs, and high-pin-count telecom interface boards requiring 46 positions at 0.050" pitch with a flush-mounted low-profile body. The flush-mount and polarizing key (K) options reduce mating errors and enable tighter component clearances in height-constrained enclosures. It is well-suited for production environments where repeatable, reliable assembly of dense connector arrays is required.
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 flush-mount (FM) body option on the SFM-123-02-FM-D-A-K mean for board-to-board stack height?
The FM (flush-mount) designation means the connector body sits lower on the PCB surface than a standard-height SFM variant, reducing the above-board profile by approximately 0.5 mm to 1.0 mm at the 0.050" (1.27 mm) pitch. This enables tighter board-to-board separation in compact embedded stack assemblies, such as SOM carrier boards and dense FPGA daughtercards, where overall system height must stay within a 10 mm envelope.
How many signals can the SFM-123-02-FM-D-A-K route, and how does the 0.050" pitch impact trace routing versus a 0.100" pitch connector?
The SFM-123-02-FM-D-A-K routes 46 signals across 2 rows at 0.050" (1.27 mm) pitch, occupying approximately 30 mm of board length (23 positions per row). By contrast, a comparable 46-position connector at 0.100" (2.54 mm) pitch would span 60 mm. The 0.050" pitch halves the connector footprint, freeing 30 mm of board edge for additional components or routing channels in space-constrained embedded designs.
In which high-reliability applications is the SFM-123-02-FM-D-A-K specifically designed to perform over thousands of mating cycles?
SAMTEC SFM-series high-reliability socket strips are rated for operating temperatures from -55°C to +125°C and designed for applications requiring hundreds to thousands of mating cycles. SFM-123-02-FM-D-A-K is therefore well-matched to automated test equipment (ATE) bed-of-nails fixtures, hot-swap module carriers, and field-replaceable unit (FRU) boards in telecom racks where the 46-position connector must retain contact resistance below 20 mΩ after repeated insertion cycles.
When should an engineer specify the K (key) option on SFM-123-02-FM-D-A-K rather than the standard non-polarized version?
The K polarization key should be specified when the PCB design includes multiple SFM connectors with the same 46-position dual-row 0.050" pitch footprint in close proximity, creating a risk of swapped mating. The physical key makes the SFM-123-02-FM-D-A-K and its mating header directionally unique, eliminating reverse-insertion damage and saving debug time during manufacturing and field maintenance of FPGA boards, embedded computing modules, and telecom line cards.
Related Guides
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
0402 10uF X5R Decoupling Design Guide for Compact Digital Rails
Application note for using CL05A106MP5NUNC-class 0402 10uF X5R MLCCs in compact digital rail decoupling designs.
Jun 19, 2026
How to Choose an 0805 10uF MLCC for Decoupling and Bulk Capacitance
Selection guide for choosing 0805 10uF MLCCs around CL21A106KOQNNNE, covering derating, dielectric, package, and sourcing checks.
Jun 19, 2026
Why Buy from FindMyChip
About SAMTEC
SAMTEC is a leading electronic component manufacturer. FindMyChip sources SAMTEC ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”