SFM-137-T2-LM-D-A-P SAMTEC Connector (Other) In Stock
SAMTEC SFM-137-T2-LM-D-A-P is a 74-position, dual-row, 0.050 inch pitch high-reliability surface-mount socket strip with 148 total contacts, featuring a low-profile mount (LM) design and T2 stacking height. Ideal for compact mezzanine stacking in high-density FPGA and signal processing platforms. Available with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 74
- Lifecycle
- ACTIVE
- Datasheet
- SFM-137-T2-LM-D-A-P Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 148 total contacts (74 positions, dual-row) on 0.050 inch (1.27 mm) pitch, providing exceptionally high I/O density for FPGA expansion, DSP mezzanine, and high-speed signal routing applications
- Low-profile mount (LM) construction minimizes the overall stacked board height compared to standard-height SFM variants, enabling slimmer chassis and enclosure designs for space-constrained systems
- High-reliability socket with gold-plated contacts and T2 stacking height specification, ensuring precise board separation and consistent contact engagement depth across the 148-pin interface
Applications
The SFM-137-T2-LM-D-A-P is designed for high-density FPGA mezzanine boards, software-defined radio modules, and multi-channel data acquisition systems that require 148-pin board-to-board connectivity on a 0.050 inch pitch with minimal stack height. The low-profile mount design is particularly suited to compact enclosures, portable instruments, and rack-mounted equipment where board-to-board clearance is at a premium. Its gold-plated contacts and high-reliability construction support demanding applications with frequent board swaps or operation in harsh thermal environments from -40°C to +85°C.
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
For a software-defined radio platform needing 148 signal and power connections between two boards, how does the SFM-137-T2-LM-D-A-P's 0.050 inch pitch layout fit within a compact chassis?
At 0.050 inch (1.27 mm) pitch with 74 positions per row, the SFM-137-T2-LM-D-A-P spans approximately 93.5 mm in row length. This is substantially shorter than a 0.100 inch pitch connector carrying the same 148 contacts, which would require around 187 mm of row length. For a software-defined radio chassis constrained to a 100 mm wide PCB form factor, the 0.050 inch pitch dual-row SFM-137 fits within the board edge while a 0.100 inch pitch alternative would not.
What is the significance of the LM (low-profile mount) suffix on the SFM-137-T2-LM-D-A-P compared to a standard-height SFM variant for a slim enclosure design?
The LM (low-profile mount) suffix indicates a reduced unmated socket body height compared to standard SFM variants. This results in a lower overall mated stack height when paired with the corresponding T2 header, potentially reducing the board separation from a typical 8 mm to 11 mm down to approximately 5 mm to 7 mm depending on the specific configuration. In slim chassis or portable instruments with tight Z-axis constraints, the LM design allows two boards with tall components to fit within a restricted enclosure height that a standard-height socket would exceed.
How do the gold-plated contacts of the SFM-137-T2-LM-D-A-P support reliability in a 148-pin mezzanine interface subject to thermal cycling between -40°C and +85°C?
Gold plating on the 148 contacts of the SFM-137-T2-LM-D-A-P provides corrosion resistance and maintains stable contact resistance over thousands of thermal cycles between -40°C and +85°C. Unlike tin-plated contacts, which can develop oxide layers or fretting corrosion when micro-motion occurs during thermal expansion, gold contacts sustain low and predictable contact impedance across the full 148-pin interface. This is critical in high-speed signal paths where contact resistance variation of even a few milliohms can degrade signal quality or cause intermittent failures.
Related Guides
How to Choose a Digital Potentiometer: AD5204, AD5206, and AD8403 Selection Guide
Compare the AD5204, AD5206, and AD8403 multi-channel SPI digipots by channel count, resistance value, and package to choose the right Analog Devices digital potentiometer for your design.
Jun 21, 2026
AD7745 / AD7746 / AD7747 Capacitance-to-Digital Converter Design Guide
Complete application note for the AD774x CDC family: circuit design, shielding, conversion rate selection, and sourcing guidance for the AD7745, AD7746, and AD7747.
Jun 21, 2026
ECMF02-4CMX8 Common-Mode Filter with ESD Protection: Selection Guide
Compare ECMF02-4CMX8 vs ECMF02-2AMX6, ECMF04-4HSM10, and other ST ECMF filters. Choose the right 4-channel common-mode filter with ESD protection for USB 2.0.
Jun 20, 2026
AD5204 Quad Digital Potentiometer Selection Guide (2026)
How to choose the right AD5204 quad digital potentiometer: compare 10kΩ vs 100kΩ variants, TSSOP vs SOIC packages, and SPI interface options for your design.
Jun 20, 2026
Why Buy from FindMyChip
About SAMTEC
SAMTEC is a leading electronic component manufacturer. FindMyChip sources SAMTEC ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Their engineering team helped us find a pin-compatible alternative when our original MCU went EOL.”