SFM-139-02-SM-D-A-K SAMTEC Connector (Other) In Stock
SFM-139-02-SM-D-A-K is a SAMTEC 78-position dual-row high-reliability socket strip at 0.050" (1.27 mm) pitch with surface-mount termination, gold-plated contacts rated at 1 A per pin, and a keying option for polarized mating in dense PCB designs. From $9.20 in stock with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- SFM-139-02-SM-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 at 0.050" (1.27 mm) pitch enabling high-density board-to-board connections with 39 contacts per row and gold-plated finish below 20 mΩ contact resistance
- Keyed (-K suffix) mating interface preventing reversed connector insertion and ensuring correct signal alignment across 30+ mating cycles in high-reliability assembly
- 1 A per pin current rating across both signal and ground contacts supporting mixed low-power supply and high-speed digital signal routing in mezzanine card designs
Applications
The SFM-139-02-SM-D-A-K is suited for FPGA mezzanine card interconnects, embedded module stacking, and defense electronics where a 78-position dual-row 0.050" pitch SMT socket with keying prevents assembly errors in high-density designs. Its gold-plated contacts and high-reliability rating support vibration-tolerant board-to-board links in aerospace payload systems and industrial control boards operating across a wide temperature range. The surface-mount termination also allows integration into compact communication equipment and test fixture interfaces requiring reliable multi-cycle mating.
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 does SFM-139-02-SM-D-A-K provide, and what is the per-pin current rating?
The SFM-139-02-SM-D-A-K provides 78 contacts in 2 rows (39 per row) at a 0.050" (1.27 mm) pitch, with each gold-plated pin rated at 1 A. This supports simultaneous routing of low-power supply rails and high-speed digital signals across a single compact board-to-board interface on densely populated PCBs.
What does the -SM suffix mean on SFM-139-02-SM-D-A-K, and how does it affect the PCB footprint?
The -SM suffix denotes surface-mount termination, meaning the connector solders directly to PCB pads rather than through-hole pins. The surface-mount footprint reduces PCB drilling cost and simplifies assembly on double-sided reflow lines, while the 0.050" (1.27 mm) dual-row layout keeps the total footprint under 100 mm² for a 78-position connector.
When should I choose SFM-139-02-SM-D-A-K over SFM-137-L2-S-D-A-K for a mezzanine board design?
Choose SFM-139-02-SM-D-A-K when your interface requires 78 positions (39 per row) at 0.050" pitch, adding 4 more signal or power pins versus the 74-position SFM-137. Both use gold-plated contacts rated at 1 A per pin with the -K keying feature; select based on whether your mezzanine pinout map allocates 74 or 78 connections to the board-to-board interface.
Can SFM-139-02-SM-D-A-K be used in aerospace or defense environments, and what temperature range applies?
Yes, the SFM-139-02-SM-D-A-K is rated for high-reliability applications in aerospace and defense electronics. SAMTEC SFM series connectors are designed to operate from -55°C to +125°C, with gold-plated contacts maintaining contact resistance below 20 mΩ across 30 or more mating cycles under vibration and thermal cycling conditions.
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