SFM-109-T2-STL-D-A-P SAMTEC Connector (Other) In Stock
SAMTEC SFM-109-T2-STL-D-A-P is an 18-position dual-row high-reliability surface-mount socket strip with 1.27 mm (0.050") pitch, short tail leads (STL), through-hole assist posts, and a polarization peg for secure orientation. Designed for compact mezzanine and board-to-board assemblies. From $2.20 in stock worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 18
- Lifecycle
- ACTIVE
- Datasheet
- SFM-109-T2-STL-D-A-P Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 18-position dual-row socket at 1.27 mm (0.050") pitch offering 18 signal connections in a compact SMT footprint
- Short tail leads (STL) reducing solder tail height for ultra-low-profile PCB-to-PCB mated stack assemblies
- Through-hole assist posts (A option) providing enhanced mechanical retention and resistance to mating forces on 18-pin dual-row contacts
- Polarization peg (P option) preventing reverse insertion and protecting circuits from potential mis-mating damage
Applications
The SFM-109-T2-STL-D-A-P is used in compact board-to-board and mezzanine applications within wearables, medical devices, and small embedded systems where 18-pin dual-row connections at 1.27 mm pitch with minimal stack height are required. The short tail lead (STL) design minimizes the solder tail protrusion below the PCB, enabling a reduced mated stack height suitable for ultra-thin product enclosures with less than 5 mm PCB-to-PCB clearance. Through-hole assist posts and a polarization peg together ensure robust, correctly-oriented assembly even in high-volume automated production.
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 is the position count and pitch of the SFM-109-T2-STL-D-A-P, and how does it fit into compact embedded designs?
The SFM-109-T2-STL-D-A-P has 18 positions in a dual-row layout at 1.27 mm (0.050 inch) pitch, with 9 contacts per row. The 18-pin count at 1.27 mm pitch fits within a PCB footprint of approximately 12.7 mm × 5 mm, making it suitable for compact embedded modules, wearable sensor boards, and medical device PCBs where connection density must be maximized within a limited area.
How do short tail leads (STL) on the SFM-109-T2-STL-D-A-P enable lower mated stack heights compared to standard tail leads?
Short tail leads (STL) reduce the vertical height of the solder tails below the PCB surface by approximately 0.5 mm to 1 mm compared to standard tail length options. In a mezzanine assembly where PCB-to-PCB clearance is limited to 4 mm or less, this reduction allows the 18-pin dual-row connector pair to mate within the available gap without the tails impeding the opposing board's components or ground plane.
For a medical wearable PCB assembly, why might a designer choose the SFM-109-T2-STL-D-A-P over a flex cable with the same 18 signal count?
A board-to-board socket like the SFM-109-T2-STL-D-A-P at 1.27 mm pitch maintains a rigid, low-impedance signal path between two PCBs, avoiding the impedance variations and insertion loss that a flex cable introduces at signal rates above 500 Mbps. For medical wearable designs where the two boards are permanently stacked within 4 mm of each other, the rigid mezzanine connection also eliminates flex cable fatigue failure, which can occur after thousands of bend cycles in wrist-worn devices.
In a high-volume automated SMT line, how does the polarization peg (P) on the SFM-109-T2-STL-D-A-P reduce production defects?
The polarization peg physically prevents the 18-pin dual-row socket from being placed in the wrong orientation by automated pick-and-place machines, blocking seating unless the peg aligns with its corresponding keyway on the mating header. Without this peg, a reversed insertion at 1.27 mm pitch could apply 3.3V supply voltage to signal output pins, causing immediate IC damage in a production run — the peg eliminates this failure mode at zero added cost per unit.
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.”