SFM-126-02-FM-D-A-K-TR SAMTEC Connector (Other) In Stock
SAMTEC SFM-126-02-FM-D-A-K-TR is a 52-position, dual-row, high-reliability socket strip with 1.27 mm (0.050 inch) pitch for surface mount applications. Features gold-plated contacts, keyed alignment, and tape-and-reel packaging for high-volume automated assembly on compact PCBs. Designed for demanding board-to-board and mezzanine interconnect applications.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 52
- Lifecycle
- ACTIVE
- Datasheet
- SFM-126-02-FM-D-A-K-TR Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 52 positions in dual-row 1.27 mm pitch for high-density board-to-board signal and power routing
- Keyed (K suffix) connector body prevents incorrect mating orientation in field-serviceable assemblies
- Tape-and-reel (TR suffix) packaging enables high-throughput automated pick-and-place SMT assembly
- FM (formed metal) leads provide optimized solder joint geometry for 1.27 mm pitch SMT pads
- High-reliability gold-plated contacts rated for hundreds of mating cycles with stable contact resistance
Applications
SFM-126-02-FM-D-A-K-TR is designed for high-density mezzanine and daughter card interconnects in defense electronics, industrial control systems, and high-performance computing modules. Its 52-position dual-row layout and keyed design support reliable mating in applications where field replacement of sub-modules is required. The 1.27 mm pitch allows routing of 26 differential signal pairs in a footprint approximately 34 mm in length.
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 many contacts and what pitch does the SFM-126-02-FM-D-A-K-TR provide?
The SFM-126-02-FM-D-A-K-TR provides 52 total contacts in a dual-row configuration with 26 positions per row at a 1.27 mm (0.050 inch) pitch. The connector body spans approximately 34 mm in length, making it suitable for high-pin-count module interconnects in compact PCB designs where a standard 2.54 mm pitch connector would require twice the board space.
What does the K suffix on SFM-126-02-FM-D-A-K-TR indicate, and how does it help during board servicing?
The K suffix designates a keying feature that physically prevents incorrect mating between non-complementary connectors in the same 1.27 mm pitch family. In multi-board systems with several similar 52-pin connectors, the keyed configuration ensures each daughter card connects only to its designated socket, preventing 180-degree inversion errors that could damage signal traces or power circuitry during maintenance or field upgrades.
What signal integrity characteristics does SFM-126-02-FM-D-A-K-TR offer for high-speed differential pair routing?
The SFM-126-02-FM-D-A-K-TR's 1.27 mm pitch and controlled-geometry contacts support differential pair routing with characteristic impedance near 100 ohms when routed with appropriate PCB trace widths and spacing. The 52-position layout accommodates 26 differential pairs simultaneously, supporting LVDS, CML, or PCIe-class signals at data rates above 1 Gbit/s per channel without requiring additional shielding.
How does SFM-126-02-FM-D-A-K-TR's mating cycle rating compare to lower-cost board-to-board alternatives?
SAMTEC SFM series high-reliability connectors like SFM-126-02-FM-D-A-K-TR are rated for a minimum of 500 mating cycles with contact resistance maintained below 20 milliohms, exceeding the typical 30-50 cycle rating of economy-grade 1.27 mm board-to-board sockets. This durability advantage justifies the higher cost per unit in test fixtures, hot-swap modules, and field-replaceable line cards where connectors are mated and unmated repeatedly.
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