SFM-139-T2-H-D-A SAMTEC Connector (Other) In Stock
SFM-139-T2-H-D-A is a SAMTEC 78-position dual-row high-reliability surface-mount socket strip at 0.050" (1.27 mm) pitch. Features high-retention mating force contacts rated at 2 A per pin and -55 °C to +125 °C operating range. Available in stock worldwide.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-T2-H-D-A Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 78-position dual-row socket at 1.27 mm pitch packs 39 contacts per row for high-density SMT mezzanine interconnects
- High-retention (H) contact design provides increased mating force for secure retention in high-vibration environments without secondary locking hardware
- Gold-over-nickel contact plating maintains contact resistance below 20 mΩ across hundreds of mating and un-mating cycles
- Rated 2 A per pin continuous with an operating temperature range of -55 °C to +125 °C, meeting industrial and mil-grade reliability requirements
- SMT termination style integrates into standard lead-free reflow assembly processes up to 260 °C peak reflow temperature
Applications
The SFM-139-T2-H-D-A is applied in board-to-board interconnects on FPGA evaluation modules, embedded processor carrier cards, and industrial control mezzanine assemblies requiring 78 circuits at a compact 1.27 mm pitch. The high-retention contact variant is especially valued in ruggedized field equipment—such as transportation electronics and industrial robots—where vibration would otherwise cause intermittent contact with standard-retention socket strips. Defense and avionics board-stack designers also select this series for its extended temperature rating and compatibility with the SAMTEC TSM header ecosystem.
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 H suffix mean in SFM-139-T2-H-D-A and how does it affect mating force?
The H suffix designates a high-retention contact design that increases the normal force on each of the 78 positions compared to standard SFM sockets. This higher mating force — typically 30% to 50% greater insertion and extraction effort — provides a more secure mechanical connection in applications subject to vibration or shock loads, reducing the risk of intermittent contact without requiring secondary latches.
How many circuits does the SFM-139-T2-H-D-A provide and at what pitch does it operate?
The SFM-139-T2-H-D-A delivers 78 positions in a dual-row arrangement at 1.27 mm (0.050 inch) pitch, placing 39 contacts per row. This circuit density is sufficient for connecting a mid-sized FPGA daughter card carrying 64-bit wide data buses, multiple SPI/I2C interfaces, and several power rails all through a single SMT connector pair.
What continuous current and temperature range is each contact in the SFM-139-T2-H-D-A rated for?
Each contact carries 2 A continuous current, so the 78-position connector can deliver up to 156 A total if all pins are used for power, though in practice designers split pins between power and signals. The operating temperature range extends from -55 °C to +125 °C, covering automotive under-hood, military, and outdoor industrial environments without derating.
Which SAMTEC plug headers mate with the SFM-139-T2-H-D-A and what stack heights are available?
The SFM-139-T2-H-D-A mates with SAMTEC TSM and SFM dual-row pin-header plugs at 1.27 mm pitch with 39 columns per row. Compatible mating headers are available in straight or right-angle orientations with selectable board-to-board stack heights ranging from approximately 4 mm to 20 mm, giving layout flexibility without changing the 78-circuit interface.
For a compact industrial control PCB, how does the SFM-139-T2-H-D-A compare to a 78-pin ZIF socket for daughter-card interconnects?
Unlike a ZIF socket that requires a locking actuator adding 3 mm to 5 mm of height and additional PCB area, the SFM-139-T2-H-D-A's SMT dual-row format keeps the connector height near 3 mm above the PCB surface with no moving parts. The high-retention H contact variant eliminates the need for a ZIF mechanism entirely in most industrial vibration profiles up to 10 g, while the 2 A per pin rating and 1.27 mm pitch provide equivalent or better current density in a smaller board footprint.
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