SFM-121-02-L-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC SFM-121-02-L-D-A-K is a high-reliability 42-position dual-row surface-mount socket strip on 0.050-inch (1.27 mm) pitch with gold-over-nickel contacts and beryllium copper spring for consistent mating. Polarized housing prevents incorrect insertion, ensuring reliable signal integrity. Available from authorized distributors with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 42
- Lifecycle
- ACTIVE
- Datasheet
- SFM-121-02-L-D-A-K Datasheet PDF
- Category
- Connector
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 42-position dual-row socket strip on 0.050-inch (1.27 mm) pitch enabling high-density board-to-board interconnects
- Gold (10 microinch) over nickel (50 microinch) mating contact finish provides low contact resistance and long mating cycle life
- Beryllium copper contact material ensures consistent spring force and reliable electrical connection across thousands of mating cycles
- Polarized housing prevents incorrect mating orientation, reducing assembly errors in dense PCB environments
Applications
The SFM-121-02-L-D-A-K is designed for high-reliability board-to-board and mezzanine socket applications in telecommunications, defense electronics, and industrial computing systems. Its 42-position dual-row layout on 0.050-inch pitch supports high channel-count signal routing while minimizing PCB footprint. The gold-plated beryllium copper contacts make it suitable for high-cycle interfaces such as test fixture sockets and removable module connectors.
Specifications
| YTEOL | 9.4 |
| Additional Feature | POLARIZED |
| Body/Shell Style | SOCKET |
| Connector Type | BOARD CONNECTOR |
| Contact Finish Mating | GOLD (10) OVER NICKEL (50) |
| Contact Finish Termination | Matte Tin (Sn) - with Nickel (Ni) barrier |
| Contact Gender | FEMALE |
| Contact Material | BERYLLIUM COPPER |
| DIN Conformance | NO |
| Filter Feature | NO |
| IEC Conformance | NO |
| JESD-609 Code | e3 |
| MIL Conformance | NO |
| Mixed Contacts | NO |
| Mounting Style | STRAIGHT |
| Mounting Type | BOARD |
| Number Of Connectors | ONE |
| Number of Rows Loaded | 2 |
| Option | GENERAL PURPOSE |
| Rated Current (Signal) | 3.2A |
| Terminal Pitch | 1.27mm |
| Termination Type | SURFACE MOUNT |
| Total Number of Contacts | 42 |
| UL Flammability Code | 94V-0 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.69.40.40 |
| Country of Origin | USA |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What contact material and plating does the SFM-121-02-L-D-A-K use for reliable mating?
The SFM-121-02-L-D-A-K uses beryllium copper contacts plated with gold (10 microinch) over nickel (50 microinch) at the mating interface. Beryllium copper provides excellent spring resilience, maintaining consistent contact force over thousands of mating cycles, while the gold finish ensures low and stable contact resistance even in humid or mildly corrosive environments.
How does the polarization feature of the SFM-121-02-L-D-A-K prevent assembly errors?
The SFM-121-02-L-D-A-K includes a polarized housing that physically keys the socket to allow mating in only one orientation. This prevents reversed insertion of the 42-position dual-row connector during PCB assembly or field replacement, eliminating the risk of applying signals to incorrect pins, which could damage components operating at 3.3 V or 5 V signal levels.
For a mezzanine PCB design requiring 42 signals on a 0.050-inch pitch, how does the SFM-121-02-L-D-A-K compare to a through-hole socket?
The SFM-121-02-L-D-A-K's surface-mount termination eliminates the need for drilled through-holes, reducing PCB layer count requirements and saving board space. At 0.050-inch pitch, the 42-position SMT socket occupies roughly half the board footprint of an equivalent 0.100-inch through-hole socket, enabling higher routing density on adjacent PCB layers.
Which procurement channels offer the SFM-121-02-L-D-A-K and what lead times should engineers plan for?
The SFM-121-02-L-D-A-K is available through SAMTEC's authorized global distribution network, including major electronics distributors. Standard stock availability supports same-day or next-day shipping for small quantities, while larger production volumes may require 4 to 8 weeks lead time. Engineers should verify the current stock level and pricing, which typically ranges from a few dollars per unit for small quantities down to below one dollar per unit at high volumes.
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