SFM-128-T2-H-D-A-K-TR SAMTEC Connector (Other) In Stock
SAMTEC SFM-128-T2-H-D-A-K-TR is a 56-position dual-row high-reliability surface-mount socket strip with 0.050 inch (1.27 mm) pitch, featuring high-retention locking, solderable to PCB via SMT, supplied in tape-and-reel. Available from stock worldwide.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 56
- Lifecycle
- ACTIVE
- Datasheet
- SFM-128-T2-H-D-A-K-TR Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 56 positions (28 per row) at 0.050 inch pitch enabling dense dual-row SMT signal interconnect
- K (locking) retention mechanism providing positive mating engagement and vibration resistance in demanding environments
- Tape-and-reel (TR) packaging optimized for automated pick-and-place SMT production lines
- A (polarizing) feature preventing incorrect connector orientation during mating, reducing assembly errors
Applications
The SFM-128-T2-H-D-A-K-TR is suited for high-reliability embedded computing boards, ruggedized test equipment, and defense electronics modules requiring 56 dual-row contacts at 1.27 mm pitch with secure locking and polarized mating. Its tape-and-reel packaging and SMT attachment support automated production of mezzanine card assemblies and FPGA daughterboards where connector security under vibration is required.
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 does the K suffix in SFM-128-T2-H-D-A-K-TR indicate about its mating retention capability?
The K suffix denotes a locking mechanism that provides positive retention between mated connector pairs, resisting accidental unmating under vibration and shock. This locking feature is especially important in rugged and aerospace applications subject to MIL-STD-810 vibration levels, where a standard press-fit 56-pin 1.27 mm pitch connector might disengage under mechanical stress without an active retention mechanism.
What is the pin count configuration of SFM-128-T2-H-D-A-K-TR, and how much PCB space does it require?
The SFM-128-T2-H-D-A-K-TR provides 56 pins in 2 rows of 28 contacts at 0.050 inch (1.27 mm) pitch. The dual-row pad field spans approximately 35.6 mm in length and 2.54 mm between row centerlines, fitting within a compact SMT footprint that routes 56 independent signals in a strip approximately 35 mm long on the PCB, suitable for FPGA expansion cards and sensor interface modules.
How does the A (polarizing) feature on SFM-128-T2-H-D-A-K-TR prevent assembly errors in production?
The A suffix indicates a polarizing key that is asymmetrical to the connector body, allowing it to mate only in one correct orientation with a corresponding polarized header. This prevents 180-degree mis-insertion that could short 56 signals and damage connected devices on 3.3 V or 5 V powered boards. The polarization is physical, requiring no software or marking checks, and is effective even in high-speed automated assembly environments.
For a defense electronics module requiring 56 I/O at 1.27 mm pitch, how does SFM-128-T2-H-D-A-K-TR compare to lower-reliability connectors?
The SFM-128-T2-H-D-A-K-TR provides a higher-reliability option versus standard commercial-grade 1.27 mm pitch sockets by combining a locking K mechanism, polarizing A feature, gold-over-nickel contact plating for low contact resistance below 20 milliohms, and H (high-retention) plastic housing rated for operation from -55 °C to +125 °C. These combined features meet the tighter environmental and mechanical requirements of defense, aerospace, and industrial test equipment compared to basic commercial 56-pin SMT sockets.
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