SFM-145-L2-STL-D-A-K SAMTEC Connector (Other) In Stock
The SFM-145-L2-STL-D-A-K is a high-reliability, dual-row surface-mount socket strip offering 90 positions at a 0.050" (1.27 mm) pitch. It supports dense board-to-board and mezzanine interconnects in compact, high-density electronic assemblies. Available from stock worldwide with fast shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 90
- Lifecycle
- ACTIVE
- Datasheet
- SFM-145-L2-STL-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 90-position dual-row configuration at 0.050" (1.27 mm) pitch maximizes signal-pin count in a minimal PCB footprint
- High-reliability SMT termination rated from -55°C to +125°C ensures stable contact performance across industrial and extended temperature environments
- STL (stacking) variant enables configurable board-to-board stack heights for flexible mezzanine module designs
- Samtec SFM series mating compatibility provides a complete, verified 90-pin header-socket pair with contact resistance below 20 milliohms
Applications
The SFM-145-L2-STL-D-A-K is used in high-density mezzanine and board-to-board applications such as FPGA expansion modules, radar signal-processing boards, and modular server blade designs requiring 90 or more signal connections per connector. The stacking (STL) variant allows designers to set the board separation height to match thermal or mechanical constraints in the enclosure. Its reflow-compatible SMT footprint integrates into automated assembly lines without additional hand-soldering steps.
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 SFM-145-L2-STL-D-A-K support, and how does the stacking variant differ from a standard SFM socket?
The SFM-145-L2-STL-D-A-K provides 90 positions in a dual-row layout at 0.050-inch (1.27 mm) pitch, for a total of 45 contacts per row. The STL (stacking) suffix indicates the connector body is designed for board-to-board stacking applications where the mating header sets the inter-board separation height, typically available in increments from 3 mm to over 20 mm to accommodate components or airflow gaps between the boards.
What temperature range does SFM-145-L2-STL-D-A-K support for use in industrial or harsh environments?
The SFM-145-L2-STL-D-A-K is rated for operation from -55°C to +125°C, meeting the requirements of both standard industrial (-40°C to +85°C) and extended temperature applications. This range is sufficient for use in outdoor telecommunications equipment, avionics ground-support instrumentation, and industrial motor-drive control boards where ambient temperatures fluctuate across more than 100°C.
For a modular FPGA carrier board, how many differential pairs can SFM-145-L2-STL-D-A-K route across the board-to-board interface?
With 90 contacts available across 2 rows of 45 pins each, SFM-145-L2-STL-D-A-K can carry up to 44 differential pairs when one pin per row is reserved for ground reference, or up to 45 differential pairs using adjacent row contacts with a common ground return in the mating header. This supports high-speed interfaces such as 44 LVDS lanes at data rates up to several Gbps per pair for FPGA-to-FPGA or FPGA-to-ADC interconnects.
How does SFM-145-L2-STL-D-A-K compare to a 90-pin ZIF socket for reliability in repeated-mate applications?
Unlike a ZIF (zero insertion force) socket that relies on a latch mechanism and has a lower cycle-life rating typically around 50-100 mates, the SFM-145-L2-STL-D-A-K uses a fixed spring-contact design rated for more than 100 insertion cycles with contact resistance below 20 milliohms. For permanent or semi-permanent mezzanine assemblies that are mated once during manufacturing and never removed in the field, the SFM offers better contact stability and lower interface resistance than a ZIF socket.
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