SFM-137-L2-F-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-137-L2-F-D-A-K is a 74-position dual-row high-reliability surface mount socket strip with 1.27 mm (0.050 inch) pitch for dense board-to-board signal routing. It features female socket contacts with keying and anti-misalignment features for accurate PCB mating in precision electronics. Available from authorized distributors with worldwide shipping for industrial and communications systems.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 74
- Lifecycle
- ACTIVE
- Datasheet
- SFM-137-L2-F-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 at 1.27 mm (0.050 inch) pitch enables dense 37-signals-per-row board-to-board interconnection in compact SMT layouts
- High-reliability socket strip design rated for 1000+ mating cycles with contact resistance consistently below 20 mΩ per pin
- Anti-misalignment keying (K suffix) and L2 extended tail provide secure mechanical registration, preventing incorrect mating in automated assembly
Applications
The SFM-137-L2-F-D-A-K is used in high-density board-to-board interconnect applications for embedded computing modules, FPGA daughter cards, and communication backplanes requiring 74 dual-row contacts at 1.27 mm pitch within a compact PCB footprint. Its extended solder tail (L2) and keying features make it suitable for telecommunications line cards and industrial control systems where reliable multi-cycle mating is required across -55°C to +125°C operating temperatures.
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 signal positions does SFM-137-L2-F-D-A-K carry and what pitch separates each contact?
SFM-137-L2-F-D-A-K carries 74 positions arranged in 2 rows of 37 contacts each at 1.27 mm (0.050 inch) pitch, making it one of the most signal-dense compact SMT socket strips in SAMTEC's SFM family.
For FPGA mezzanine card designs, what advantage does SFM-137-L2-F-D-A-K's 74-position layout offer?
A 74-position dual-row socket provides sufficient pins to carry 32-bit data buses, 16 address lines, and multiple control signals in a single connector, reducing FPGA mezzanine card width by 30% compared to two separate 40-position connectors, while the L2 extended tail ensures stable solder joints during 260°C reflow.
When should SFM-137-L2-F-D-A-K be chosen over wire-to-board alternatives for telecom backplane connections?
SFM-137-L2-F-D-A-K is the better choice when the design requires 74 controlled-impedance connections below 50 Ω at frequencies up to 1 GHz, as the 1.27 mm pitch SMT socket maintains consistent signal integrity that flying-wire harnesses cannot achieve at these contact densities and signal speeds.
Does SFM-137-L2-F-D-A-K's K-suffix keying prevent incorrect board mating in field-service scenarios?
Yes, the K-suffix adds a physical polarization key that prevents 180-degree reverse insertion of mating header pins into SFM-137-L2-F-D-A-K's 74-position socket, eliminating signal cross-connection damage during field service operations where the connector is mated and unmated up to 100 times over equipment lifetime.
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