SFM-139-02-S-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-139-02-S-D-A-K is a 78-position dual-row surface mount socket strip with 0.050" (1.27 mm) pitch, designed for high-density mezzanine and board-to-board interconnects in compact instrumentation and computing modules. From $8.50 in stock with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-02-S-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 78-position dual-row surface mount socket with 0.050" (1.27 mm) pitch, delivering 78 signal paths in a compact SMT footprint
- High reliability socket strip design rated for repeated mating cycles suitable for test fixtures and modular embedded computing boards
- Compatible with SAMTEC SFM/SSM male header series enabling flexible board stacking heights from 1 mm to 15 mm with standard mating headers
- Surface mount termination style simplifies automated PCB assembly and eliminates through-hole drilling for dense multi-layer board designs
Applications
SFM-139-02-S-D-A-K is used in high-density mezzanine board-to-board interconnect assemblies for embedded computing, FPGA development boards, and RF module stacking where 78 signals must pass in a 0.050" pitch SMT envelope. Single-board computers and data acquisition modules benefit from the large contact count enabling parallel data buses, power rails, and control signals within one connector footprint. The high-reliability construction makes it suitable for test-and-measurement sockets where boards are inserted and removed frequently.
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 78-position dual-row layout of SFM-139-02-S-D-A-K compare to single-row alternatives for high-density signal routing?
SFM-139-02-S-D-A-K provides 78 contacts across 2 rows with 0.050" (1.27 mm) pitch, achieving a contact density of roughly 15 pins per 10 mm of connector length. A single-row equivalent would require a connector nearly twice as long to carry the same 78 signals, making the dual-row SFM-139 the preferred choice for mezzanine boards limited to 50 mm or less in connector edge length.
Which SAMTEC male headers mate with SFM-139-02-S-D-A-K and what stacking heights are available?
SFM-139-02-S-D-A-K mates with SAMTEC SSM and SFH series male headers sharing the same 0.050" (1.27 mm) dual-row pitch. Mated stacking heights from 3 mm to 15 mm are available by selecting header post lengths, enabling system designers to maintain precise board-to-board separation for thermal management or clearance of tall components between stacked boards.
Is SFM-139-02-S-D-A-K suitable for automated pick-and-place assembly, and what soldering profile applies?
Yes. The surface mount termination of SFM-139-02-S-D-A-K is compatible with standard SMT pick-and-place equipment using vacuum nozzles, and it reflows with lead-free solder paste profiles peaking at 260°C for 30 seconds. The SMT footprint eliminates the need for through-hole drilling in the PCB, saving approximately 78 plated via holes per connector and simplifying 6-layer or 8-layer board stack-up designs.
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