TFC-121-02-FM-D-A-K-TR SAMTEC Connector (Other) In Stock
The SAMTEC TFC-121-02-FM-D-A-K-TR is a 42-position Tiger Eye cost-effective terminal strip with 1.27 mm (0.050") pitch dual-row configuration and surface-mount footprint in tape-and-reel packaging. It features polarization post keying, floating mount capability, and fine-pitch contacts for high-density board-to-board signal interfaces. Suitable for embedded computing modules, test system backplanes, and compact industrial controllers requiring reliable fine-pitch SMT connectivity.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 42
- Lifecycle
- ACTIVE
- Datasheet
- TFC-121-02-FM-D-A-K-TR Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TFC-121-02-FM-D-A-K-TR?
- 42-position dual-row layout on 1.27 mm (0.050 inch) pitch for high-density SMT board-to-board interfaces
- Tiger Eye contact design provides low insertion force with high retention and reliable electrical connection
- Polarization post (-K option) prevents incorrect board orientation during assembly and field swaps
- Tape-and-reel (-TR) packaging supports automated pick-and-place assembly on high-volume SMT production lines
What is TFC-121-02-FM-D-A-K-TR used for?
The TFC-121-02-FM-D-A-K-TR is used in mezzanine card interconnects, FPGA development boards, and compact embedded module stacking applications where 42 signals must be routed across boards at a 1.27 mm pitch in a minimal PCB footprint. The Tiger Eye contact design reduces insertion force requirements compared to standard pin-socket interfaces, simplifying field module replacement. Its cost-effective design makes it a practical choice for mid-volume industrial and test equipment builds.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the TFC-121-02-FM-D-A-K-TR datasheet?
TFC-121-02-FM-D-A-K-TR Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for TFC-121-02-FM-D-A-K-TR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What pitch and position count does the TFC-121-02-FM-D-A-K-TR provide, and how does this affect signal routing density on the PCB?
The TFC-121-02-FM-D-A-K-TR has 42 positions on a 1.27 mm (0.050 inch) pitch in a dual-row configuration. This means 21 contacts per row with 1.27 mm row-to-row spacing, occupying a PCB footprint of approximately 26.67 mm x 2.54 mm. This fine pitch enables high-density routing of parallel data buses, GPIO banks, or mixed signal lines within the board outline of a compact mezzanine module.
What does the Tiger Eye contact geometry of the TFC-121-02-FM-D-A-K-TR offer compared to conventional stamped socket contacts?
The Tiger Eye contact uses a machined or formed eye-of-the-needle shaped receptacle that grips the mating pin with multiple contact points. Compared to stamped beams, this geometry provides consistent contact resistance below 20 milliohms across the rated mating cycles, higher retention force relative to insertion force, and reduced susceptibility to contact damage from lateral misalignment during board stacking.
How does the polarization post (-K option) on the TFC-121-02-FM-D-A-K-TR reduce assembly defects in dual-row fine-pitch connectors?
At 1.27 mm pitch on a symmetric dual-row connector, a 180-degree mis-seated board would short adjacent signal pairs and likely destroy ICs on both mating boards. The -K polarization post mates with an asymmetrically placed hole in the plug connector, making incorrect orientation mechanically impossible. This reduces rework costs associated with mis-mating damage, which at 42 positions could affect multiple high-speed signal lines simultaneously.
When should a designer choose the TFC-121-02-FM-D-A-K-TR's floating-mount (-FM) option over a fixed-mount terminal strip?
The floating-mount option allows the connector body to shift laterally by approximately 0.5 mm to 1 mm from its nominal position before mating. This compliance accommodates PCB manufacturing tolerances in multi-board assemblies where two boards must mate simultaneously, such as in a chassis-mounted backplane system with multiple daughtercard connectors. Without float, accumulated positional tolerances across multiple connectors can create misalignment forces exceeding 50 N that stress solder joints.
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