SFM-137-L2-H-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-137-L2-H-D-A-K is a 74-position dual-row high-reliability surface mount socket strip with 1.27 mm (0.050") pitch for high-density board-to-board interconnects. Features dual-beam gold-plated contacts, anti-solder-wicking barriers, and a polarizing key for safe automated SMT assembly.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 74
- Lifecycle
- ACTIVE
- Datasheet
- SFM-137-L2-H-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 74-position dual-row socket strip on 1.27 mm (0.050") pitch providing twice the contact density of standard 2.54 mm connectors in the same PCB footprint
- High-reliability dual-beam contact design ensuring redundant electrical contact at each of 74 positions for vibration-resistant board-to-board connections
- Anti-solder-wicking (A) barriers protecting gold-plated contacts from solder contamination during reflow at standard SMT process temperatures
- Polarizing key (K) preventing incorrect insertion of the mating header into the 74-position socket, eliminating assembly errors in high-density modules
- L2 contact tail variant enabling a specific board-to-board stack height selection for precise mezzanine or expansion card spacing
Applications
The SFM-137-L2-H-D-A-K is designed for high-density mezzanine interconnects in aerospace avionics, defense electronics, and industrial instrumentation where 74 signals must be routed between stacked PCBs across a minimal footprint. Its dual-beam contacts and 1.27 mm pitch allow routing of digital buses, control lines, and power rails within a connector measuring approximately 48 mm in length. The anti-solder-wicking and keying features support reliable automated SMT production for safety-critical or high-reliability board assemblies.
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 positions does the SFM-137-L2-H-D-A-K provide, and what pitch does it use?
The SFM-137-L2-H-D-A-K is a 74-position dual-row socket strip using a 1.27 mm (0.050 inch) pitch. This fine pitch allows the connector to carry 74 signals in a footprint of roughly 48 mm x 5 mm, making it suitable for high-density mezzanine and expansion card applications where a standard 2.54 mm pitch connector would need nearly twice the PCB length for the same signal count.
What advantage does the dual-beam contact design of the SFM-137-L2-H-D-A-K provide over single-beam alternatives in vibration environments?
Each of the 74 positions in the SFM-137-L2-H-D-A-K uses dual-beam contacts, where two independent spring arms engage the mating pin simultaneously. In vibration-prone environments such as aerospace avionics or vehicle-mounted electronics exposed to 20G shock loads, the second beam maintains electrical continuity if the first beam momentarily loses contact, preventing intermittent open circuits that could cause system faults in critical applications.
Why is the anti-solder-wicking (A) feature important for SFM-137-L2-H-D-A-K during PCB reflow?
During SMT reflow soldering at temperatures of 245°C to 260°C, molten solder can wick up through the contact tails into the socket housing by capillary action, contaminating the dual-beam contact surfaces and increasing contact resistance. The anti-solder-wicking barriers in the SFM-137-L2-H-D-A-K block this migration path, preserving the gold-plated contact finish and ensuring the connector meets its rated mating cycle life across all 74 positions.
When is the SFM-137-L2-H-D-A-K a better choice than the SFM-106-T2-STL-D-A-K for a high-density mezzanine design?
The SFM-137-L2-H-D-A-K with 74 positions is the appropriate choice when the mezzanine interface requires more than 12 signal or power connections. For designs routing a 64-bit data bus plus power and ground rails requiring 74 pins total on a 1.27 mm pitch, the SFM-137-L2-H-D-A-K covers the full interface in a single connector, whereas multiple SFM-106 12-position connectors would be needed, adding PCB area and routing complexity.
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