SFM-121-L2-LM-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-121-L2-LM-D-A-K is a 42-position dual-row high-reliability surface mount socket strip with 0.050 inch pitch, long metal latch retention, designed for stable PCB-to-PCB mating. Features high-density 21-pins-per-row layout. Available in stock worldwide with competitive pricing.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 42
- Lifecycle
- ACTIVE
- Datasheet
- SFM-121-L2-LM-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 42-position dual-row socket at 0.050 inch (1.27 mm) pitch providing 21 pins per row for ultra-high-density PCB-to-PCB signal interconnects
- Long metal latch (LM) retention mechanism securing the mated connector pair and preventing accidental unmating under vibration or mechanical stress
- High-reliability socket strip design with phosphor bronze or equivalent spring contacts maintaining consistent contact normal force across extended temperature and mating cycle requirements
Applications
The SAMTEC SFM-121-L2-LM-D-A-K is designed for high-density, high-reliability PCB-to-PCB socket applications in aerospace, defense, industrial automation, and medical electronics where 42 signal connections must be maintained across vibration, shock, and thermal cycling environments. The long metal latch retention ensures secure mechanical coupling in equipment subject to repeated mechanical stress or vibration above 5g. Its compact 0.050 inch pitch dual-row footprint is ideal for daughter card sockets, expansion module interfaces, and RF front-end module connections.
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 retention mechanism does SFM-121-L2-LM-D-A-K use to prevent connector unmating under vibration?
The SFM-121-L2-LM-D-A-K features a long metal latch (LM) retention system that mechanically locks the socket to its mating header upon full insertion. This retention mechanism maintains a secure connection under vibration levels typical of industrial and aerospace environments, often exceeding 10g, preventing the 42 signal contacts from losing electrical continuity due to partial unmating.
For a compact RF module interface requiring 42 signals at 0.050 inch pitch, how does SFM-121-L2-LM-D-A-K compare to a 0.100 inch pitch alternative?
At 0.050 inch (1.27 mm) pitch, the SFM-121-L2-LM-D-A-K occupies approximately half the PCB footprint length of a 0.100 inch pitch 42-position socket for the same contact count. With 21 pins per row and 2 rows, the total mated footprint spans roughly 1.05 inches (26.7 mm) in contact length, versus approximately 2.1 inches (53.3 mm) for a comparable 0.100 inch pitch part, making the SFM-121-L2-LM-D-A-K the preferred choice when board area is critically constrained.
Which industries most commonly use SFM-121-L2-LM-D-A-K in their PCB assemblies?
The SFM-121-L2-LM-D-A-K is most commonly used in aerospace avionics boards requiring MIL-grade connector reliability, industrial PLC backplanes with 42-signal module interfaces, medical diagnostic equipment daughterboards, and high-speed data acquisition expansion cards. Its long metal latch and 0.050 inch pitch high-reliability design are specified when connectors must survive thousands of mating cycles or withstand operating temperatures between -55°C and +125°C.
How does the SMT termination style of SFM-121-L2-LM-D-A-K simplify PCB manufacturing compared to through-hole socket strips?
The surface mount termination of SFM-121-L2-LM-D-A-K eliminates the need for through-hole drilling at 42 positions, reducing PCB fabrication cost and allowing double-sided component placement. SMT reflow soldering at 260°C peak temperature forms all 42 solder joints simultaneously, compared to wave soldering or manual soldering required for through-hole variants, improving joint consistency and enabling finer-pitch components to be placed on the opposite board side directly beneath the connector footprint.
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