SFM-138-T2-S-D-A-P SAMTEC Connector (Other) In Stock
SAMTEC SFM-138-T2-S-D-A-P is a 76-position dual-row high-reliability socket strip with 0.050 inch (1.27 mm) pitch designed for surface-mount PCB assembly, featuring a T2 tail for soldering clearance. It enables high-density board-to-board interconnect with gold-plated contacts in a fine-pitch SMT form factor. Available in stock worldwide for production quantities.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 76
- Lifecycle
- ACTIVE
- Datasheet
- SFM-138-T2-S-D-A-P Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 76-position dual-row socket on 0.050 inch (1.27 mm) pitch delivering very high-density board-to-board signal routing in a compact SMT footprint
- T2 extended tail variant providing controlled solder joint height for improved solder inspection clearance and consistent stand-off
- High-reliability gold-plated contact system supporting low contact resistance across many mating cycles for test and field-replaceable module applications
- Surface-mount termination compatible with lead-free reflow soldering at up to 260°C for integration into standard SMT production processes
Applications
The SFM-138-T2-S-D-A-P is suited for high pin-count mezzanine and plug-in module designs where 76 signals or mixed signal and power contacts must span two stacked PCBs on a compact 0.050 inch pitch, significantly reducing interconnect footprint versus 0.100 inch alternatives. FPGA mezzanine cards, high-speed data acquisition modules, network switch daughter boards, and medical imaging subsystems that require dense, reliable SMT socket interfaces are primary targets. The T2 tail variant is particularly advantageous in RF or high-speed digital boards where controlled solder joint height ensures consistent impedance and simplifies automated optical inspection.
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 76-position dual-row SFM-138-T2-S-D-A-P compare to using two separate 38-position connectors for a mezzanine board design?
A single SFM-138-T2-S-D-A-P reduces the BOM from 2 components to 1, cuts assembly placement cycles by half, and provides a mechanically unified mating interface that resists differential rocking or twisting stress on the board stack. The monolithic 76-position body also shortens the total connector length by approximately 10-15 mm compared to two separate housings with required keepout gaps between them.
What does the T2 tail designation mean on the SFM-138-T2-S-D-A-P and how does it aid solder joint quality on a fine 0.050 inch pitch?
The T2 suffix specifies an extended SMT tail length that raises the connector body approximately 1.5 mm to 2 mm above the PCB surface after reflow, creating a controlled stand-off height. On a fine 0.050 inch (1.27 mm) pitch with densely packed pads, this additional clearance allows automated optical inspection equipment to view solder fillets beneath the connector body and reduces the risk of flux entrapment, improving solder joint reliability.
For a high-speed digital signal path routed through the SFM-138-T2-S-D-A-P, what impedance considerations apply at signal frequencies above 1 GHz?
The SFM-series 0.050 inch pitch socket uses a controlled-geometry contact system designed to maintain signal integrity at data rates up to several Gbps. At frequencies above 1 GHz, the contact inductance—typically in the range of 0.5 nH to 1 nH per pin—and mutual capacitance between adjacent contacts must be accounted for in simulation. SAMTEC publishes S-parameter models for the SFM series that can be imported into SI tools for channel analysis of 2.5 Gbps or higher serial links.
How should a procurement engineer evaluate stock availability and lead time for the SFM-138-T2-S-D-A-P given it is a 76-position high-pin-count connector?
High-position-count SFM connectors like the 76-position SFM-138-T2-S-D-A-P are typically stocked in smaller quantities at distributors than lower pin-count variants; lead times from SAMTEC's factory run 4 to 8 weeks for standard production orders. Procurement teams should cross-reference multiple authorized distributors, confirm on-hand stock for immediate needs, and place blanket purchase orders covering 6 to 12 months of forecast volume to avoid production delays on long-lead specialty connectors.
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