TFC-139-02-L-D-A-K SAMTEC Connector (Other) In Stock
SAMTEC TFC-139-02-L-D-A-K is a 156-position Tiger Eye cost-effective terminal strip with 0.050-inch pitch, dual-row through-hole construction, and right-angle (L) termination for horizontal mating in space-constrained PCB layouts. Includes polarizing key (K) for error-proof mating. Available in stock worldwide with fast global shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 78
- Lifecycle
- ACTIVE
- Datasheet
- TFC-139-02-L-D-A-K Datasheet PDF
- Category
- Connector
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TFC-139-02-L-D-A-K?
- 156 positions (78 per row) at 0.050-inch pitch enabling high-density dual-row right-angle signal routing
- Tiger Eye bifurcated contacts providing dual-wipe reliability and consistently low contact resistance per pin
- Polarizing key (K) option prevents incorrect mating orientation, reducing field assembly errors
- Right-angle (L) termination ideal for horizontal card-edge and front-panel access configurations
What is TFC-139-02-L-D-A-K used for?
The TFC-139-02-L-D-A-K is designed for high-density backplane interconnects, FPGA mezzanine card right-angle headers, and industrial automation I/O modules where 156 polarized signal connections must be made in a horizontal orientation at 0.050-inch pitch. Its keyed, right-angle Tiger Eye design suits test and measurement front-panel connectors, telecommunications equipment line cards, and data acquisition systems requiring guided, error-proof mating in field-service environments.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the TFC-139-02-L-D-A-K datasheet?
TFC-139-02-L-D-A-K Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for TFC-139-02-L-D-A-K?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does the K suffix in TFC-139-02-L-D-A-K indicate, and why is it important for field assembly?
The K suffix denotes a polarizing key integrated into the connector housing, which physically prevents the mating connector from being inserted in the wrong orientation. This is critical in field assembly or maintenance scenarios where technicians may connect the 156-position header in low-light or high-stress conditions. The key reduces the risk of reversed-polarity damage to sensitive ICs and signal lines, saving repair costs and avoiding production downtime.
How do the 156 positions and 0.050-inch pitch of the TFC-139-02-L-D-A-K benefit a multi-axis motion controller design?
A 156-position connector at 0.050-inch pitch consolidates encoder feedback, digital I/O, analog monitor, and communications bus lines for 4 or more servo axes into a single mated pair. This eliminates the need for 8 or more separate 20-pin connectors on the same board, reducing connector cost, cutting PCB land-pattern area, and shortening cable harness assembly time. The Tiger Eye contacts maintain reliable connections across more than 500 mating cycles, which is important in motion systems that are regularly serviced.
In what scenarios is the right-angle termination of the TFC-139-02-L-D-A-K preferred over a straight-pin variant?
Right-angle termination is preferred when the PCB is mounted horizontally in a chassis and the mating connector or cable must exit through a vertical front or rear panel. In a 1U rack enclosure, for example, a straight-pin connector would require a 90-degree cable bend that can exceed the cable's minimum bend radius and degrade signal integrity at frequencies above 100 MHz. The right-angle TFC-139-02-L-D-A-K mates directly at the panel opening without bends, reducing signal path length and improving EMI shielding continuity.
How does the SAMTEC TFC-139-02-L-D-A-K compare to a higher-count TFC-149 variant when selecting for a 150-signal interface?
For an interface requiring exactly 150 or fewer signals, the TFC-139-02-L-D-A-K provides 156 positions — enough capacity for 150 active signals plus 6 spare or ground pins — without over-specifying to the 298-position TFC-149. Using the smaller connector reduces BOM cost per unit and shrinks the PCB land pattern by roughly 40 mm of connector body length, which can be decisive in space-constrained PCB layouts. If the design later needs to expand beyond 156 signals, migrating to TFC-149 is straightforward because both share the same 0.050-inch pitch and Tiger Eye contact system.
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