TFC-139-02-LM-D-A-K-TR SAMTEC Connector (Other) In Stock
SAMTEC TFC-139-02-LM-D-A-K-TR is a 78-position dual-row Tiger Eye cost-effective terminal strip on a 0.050-inch pitch in tape-and-reel packaging, designed for high-density SMT board-to-board and board-to-cable signal connections.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- TFC-139-02-LM-D-A-K-TR Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 78-position dual-row 0.050 inch pitch layout delivers 78 circuit connections at half the footprint of 0.100 inch pitch alternatives, enabling ultra-high-density signal routing on compact multi-layer PCBs
- Tiger Eye contact technology provides enhanced wiping action and reliable gas-tight electrical connections across repeated mate/unmate cycles in demanding automated assembly environments
- Tape-and-reel (TR) packaging and LM low-profile mounting variant support high-volume automated pick-and-place SMT assembly without manual connector placement
Applications
TFC-139-02-LM-D-A-K-TR is suited for high-density computing modules, FPGA development boards, and data acquisition systems where 78 signals must be routed in the tightest possible PCB footprint using 0.050-inch pitch SMT connectors. The Tiger Eye contact design ensures reliable signal integrity in mission-critical board-to-board stacking applications such as server mezzanine cards, optical transceiver modules, and ruggedized military electronics. Tape-and-reel packaging makes it compatible with fully automated SMT lines producing high volumes of networking or telecommunications hardware.
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
How many positions and what pitch does TFC-139-02-LM-D-A-K-TR offer compared to standard 0.100 inch connectors?
TFC-139-02-LM-D-A-K-TR provides 78 positions on a 0.050 inch (1.27 mm) pitch in a dual-row layout. Compared to a standard 0.100 inch pitch connector carrying the same 78 circuits, the 0.050 inch pitch version occupies approximately half the PCB length, which is critical for high-density FPGA I/O breakout boards and compact mezzanine card interfaces where every millimeter of board space is contested.
What does the Tiger Eye contact technology in TFC-139-02-LM-D-A-K-TR contribute to signal reliability?
SAMTEC Tiger Eye contacts use a bifurcated beam design that creates 2 independent contact points per pin, providing redundant current paths and a wiping action that displaces surface oxides on each mating cycle. This dual-beam approach lowers contact resistance to under 20 milliohms and maintains gas-tight connections over hundreds of mate/unmate cycles, which is important for removable daughtercard interfaces in test-and-measurement instruments and field-serviceable rack equipment.
What does the TR suffix in TFC-139-02-LM-D-A-K-TR indicate for PCB assembly?
The TR suffix designates tape-and-reel packaging, meaning TFC-139-02-LM-D-A-K-TR is supplied on standard SMT carrier tape reels compatible with automated pick-and-place machines. This packaging allows the 78-position connector to be placed and reflowed as part of a standard SMT process alongside passive components and ICs, eliminating manual connector placement steps that would slow high-volume production of networking cards and computing modules.
For an FPGA mezzanine card with 78 I/O signals, when is TFC-139-02-LM-D-A-K-TR preferable to a 0.100 inch pitch alternative?
When the mezzanine form factor constrains the connector zone to under 40 mm of PCB edge length, fitting 78 signals at 0.100 inch pitch would require approximately 50 mm per row, exceeding the available space. At 0.050 inch pitch, TFC-139-02-LM-D-A-K-TR routes all 78 circuits within roughly 25 mm per row, freeing the remaining PCB area for decoupling capacitors, power planes, and FPGA I/O bank routing in compact FPGA module designs.
Which procurement option does TFC-139-02-LM-D-A-K-TR offer for low- versus high-volume design programs?
TFC-139-02-LM-D-A-K-TR is available in tape-and-reel quantities suited for production runs of hundreds or thousands of units, while SAMTEC also typically offers cut-strip or tray options of the same TFC series for prototype and low-volume engineering builds. Sourcing tape-and-reel from authorized SAMTEC distributors provides the same 78-position 0.050 inch pitch connector in reel quantities of 250 to 1000 pieces, enabling cost-effective scaling from initial prototype through full production.
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