SFM-102-02-STL-D-K-TR SAMTEC Connector (Other) In Stock
SAMTEC SFM-102-02-STL-D-K-TR is a 4-position dual-row high-reliability SMT socket strip with 1.27 mm (0.050 inch) pitch. It offers 2 positions per row with a surface-mount tail length (STL) variant and key (K) polarization, supplied in tape-and-reel for automated assembly in compact PCB applications.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 4
- Lifecycle
- ACTIVE
- Datasheet
- SFM-102-02-STL-D-K-TR Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-position dual-row 1.27 mm pitch layout in a minimal footprint of approximately 2.54 mm row length, ideal for ultra-compact signal interfaces
- Key (K) polarization feature prevents incorrect mating orientation, reducing assembly errors in high-reliability and field-replaceable module designs
- Surface-mount tail length (STL) variant and tape-and-reel (TR) packaging support automated SMT reflow assembly with consistent lead-free solder joint formation
Applications
The SFM-102-02-STL-D-K-TR suits small 4-signal interface connections on embedded modules, sensor nodes, and compact communication boards where 1.27 mm fine-pitch SMT sockets are required. Its keyed polarization makes it useful in field-replaceable module designs where incorrect insertion must be prevented. The minimal 4-position footprint is also employed in SPI, UART, and power rail interfaces on space-constrained PCBs.
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
Why does the SFM-102-02-STL-D-K-TR include a key (K) polarization feature?
The key polarization prevents the mating connector from being inserted in the wrong orientation, which is critical in 4-pin interfaces that carry mixed signal types such as power at 3.3 V or 5 V alongside ground and data lines. Without keying, reverse insertion can apply voltage to ground pins and damage connected ICs. The K option adds a physical tab that blocks misaligned mating, ensuring reliable and safe connections in production and field service environments.
How does the STL (surface-mount tail length) option affect soldering of the SFM-102-02-STL-D-K-TR?
The STL designation specifies a longer SMT lead tail compared to the standard variant, typically extending the solder pad engagement to approximately 1.5 mm to 2.0 mm below the connector body. This extra tail length improves solder joint strength and inspection accessibility during AOI (automated optical inspection), and it is particularly valuable in applications subject to mechanical vibration where standard solder joint height of 0.5 mm may be insufficient.
In which communication interfaces is a 4-position 1.27 mm dual-row socket like SFM-102 commonly used?
A 4-position dual-row connector at 1.27 mm pitch is frequently used for SPI interfaces (SCK, MOSI, MISO, CS — 4 signals), 2-wire I2C with power (SDA, SCL, VCC, GND), or UART with power lines, covering all required signals in a single 2 x 2 connector body. This keeps the total mated footprint under 5.08 mm x 2.54 mm, preserving board area on microcontroller modules and IoT sensor nodes operating at 3.3 V or 5 V logic levels.
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