SFM-125-L2-FM-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-125-L2-FM-D-A-K is a 50-position dual-row high-reliability surface mount socket strip with 0.050" (1.27 mm) pitch featuring gold-over-nickel contacts and a female mating interface. Engineered for high-density board-to-board signal interconnects in industrial and communications equipment. Available in stock worldwide with competitive pricing and fast shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 50
- Lifecycle
- ACTIVE
- Datasheet
- SFM-125-L2-FM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 50 contacts in dual-row 0.050" (1.27 mm) pitch for high-density board-to-board signal routing in compact PCB layouts
- Female (FM) mating interface with gold-over-nickel contact finish for low-resistance and long insertion-cycle reliability
- Surface mount termination with L2 standoff ensures precise mating height control and mechanical stability
- High-reliability construction suitable for industrial, telecom, and test-and-measurement applications
Applications
The SFM-125-L2-FM-D-A-K serves as a high-density board-to-board socket in applications such as FPGA daughter cards, DSP modules, server backplanes, and portable test instruments where 50 signal lines must be connected in minimal PCB footprint. The 0.050" pitch dual-row layout and controlled standoff height make it ideal for stacked PCB assemblies in communications equipment 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
How does the SFM-125-L2-FM-D-A-K differ from the SFM-126 series in pin count and mating options?
The SFM-125-L2-FM-D-A-K provides 50 contacts versus 52 contacts on the SFM-126 series, both using a dual-row 0.050" (1.27 mm) pitch layout. The -FM suffix on the SFM-125 designates a female mating interface with a specific tail length variant, whereas the -ZZ suffix on SFM-126 indicates an alternative tail configuration. Both families share the same 0.050" grid, so mating headers are interchangeable within the series.
What current rating and working voltage apply to the SFM-125-L2-FM-D-A-K signal contacts?
SAMTEC SFM series socket strips are typically rated at 1 A per contact at room temperature and a working voltage of 125 V AC/DC. With 50 contacts available, the connector can carry multiple power or ground rails alongside signal lines in a single compact footprint, provided the total current load per pin stays within the 1 A thermal limit to avoid localized heating on the PCB.
Does the L2 standoff designation affect the mating stack height for the SFM-125-L2-FM-D-A-K?
Yes. The L2 suffix specifies a defined post length that sets the board-to-board mating stack height when combined with a matching header. SAMTEC L2 variants typically establish a controlled air gap of approximately 8.38 mm between mated PCBs, allowing clearance for components on the lower board. This is critical in stacked PCB designs where passive components or decoupling capacitors sit beneath the upper board.
Can SFM-125-L2-FM-D-A-K handle high-speed differential signals up to 1 GHz?
Yes. SAMTEC SFM series connectors are engineered for high-speed signal integrity, supporting differential pairs at data rates up to several Gbps with characteristic impedance close to 50 Ω per contact. At 1 GHz, the insertion loss is typically below 1 dB per contact, making the SFM-125-L2-FM-D-A-K suitable for LVDS, SGMII, and DDR3/4 address lines in FPGA and processor daughter card designs.
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