TST-120-03-L-D SAMTEC Connector (Other) In Stock
SAMTEC TST-120-03-L-D is a 40-position dual-row shrouded PCB header with 2.54 mm (0.100 inch) pitch, featuring gold-plated mating contacts over nickel and phosphor bronze construction for reliable board-to-board and cable connections.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 40
- Lifecycle
- ACTIVE
- Datasheet
- TST-120-03-L-D Datasheet PDF
- Category
- Connector
- Price
- From $2.7313(MOQ 1)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TST-120-03-L-D?
- 40-position dual-row layout on 2.54 mm pitch fits high-density connector requirements
- 10 µin gold mating contact finish ensures low-resistance, corrosion-resistant connections
- Shrouded housing provides mechanical keying and protects contacts during mating
- Phosphor bronze contact material delivers excellent spring-back and long insertion-cycle life
- Tin-over-nickel termination contacts support standard solder reflow and wave soldering processes
What is TST-120-03-L-D used for?
The TST-120-03-L-D is used in development boards, test fixtures, and embedded computing platforms where a reliable 40-pin shrouded header is needed for cable-to-board or board-to-board connections. Its gold-plated contacts and shrouded design make it well-suited for JTAG programming interfaces, FPGA expansion connectors, and backplane signal distribution. The 2.54 mm pitch allows compatibility with standard ribbon cables and IDC connectors in prototyping and production test equipment.
What are the specifications of TST-120-03-L-D?
| YTEOL | 9.1 |
| Body Breadth | 0.365inch |
| Body Depth | 0.365inch |
| Body Length | 2.3inch |
| Connector Type | BOARD CONNECTOR |
| Contact Finish Mating | GOLD (10) OVER NICKEL (50) |
| Contact Finish Termination | Tin (Sn) - with Nickel (Ni) barrier |
| Contact Gender | MALE |
| Contact Material | PHOSPHOR BRONZE |
| Contact Pattern | RECTANGULAR |
| Contact Style | SQ PIN-SKT |
| DIN Conformance | NO |
| Filter Feature | NO |
| IEC Conformance | NO |
| Insulation Resistance | 5000000000Ω |
| Insulator Color | BLACK |
| Insulator Material | GLASS FILLED POLYESTER |
| JESD-609 Code | e3 |
| MIL Conformance | NO |
| Mating Contact Pitch | 0.1inch |
| Mating Contact Row Spacing | 0.1inch |
| Mating Information | MULTIPLE MATING PARTS AVAILABLE |
| Mixed Contacts | NO |
| Mounting Option 1 | LOCKING |
| Mounting Style | STRAIGHT |
| Mounting Type | BOARD |
| Number Of Connectors | ONE |
| Number Of PCB Rows | 2 |
| Number of Rows Loaded | 2 |
| Option | GENERAL PURPOSE |
| PCB Contact Pattern | RECTANGULAR |
| PCB Contact Row Spacing | 2.54mm |
| Plating Thickness | 10u inch |
| Polarization Key | POLARIZATION NOTCH |
| Terminal Length | 0.565inch |
| Terminal Pitch | 2.54mm |
| Termination Type | SOLDER |
| Total Number of Contacts | 40 |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.69.40.40 |
| Country of Origin | Malaysia, USA |
Where can I find the TST-120-03-L-D datasheet?
TST-120-03-L-D Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for TST-120-03-L-D?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the gold contact finish of the TST-120-03-L-D improve connector reliability compared to tin-only alternatives?
The TST-120-03-L-D uses 10 µin gold plating over 50 µin nickel on mating contacts, which provides superior resistance to oxidation and fretting corrosion compared to standard tin-plated contacts. Gold-plated contacts maintain stable contact resistance below 20 mΩ even after hundreds of mating cycles and in humid or mildly corrosive environments, making this connector reliable in test and instrumentation applications where consistent electrical performance is critical.
For a 40-pin JTAG or debug cable connection, how does the TST-120-03-L-D shroud prevent misinsertion damage?
The shrouded housing of the TST-120-03-L-D encloses all 40 male pins within a protective plastic shell that mechanically guides the mating female connector into correct alignment before pin contact occurs. This prevents the 0.1-inch pitch pins from bending due to misaligned insertion, a common failure mode with unshrouded headers. The polarized shroud also prevents 180-degree reversed insertion that could damage FPGAs, microcontrollers, or test targets connected to the JTAG interface.
How many insertion cycles can the TST-120-03-L-D withstand before contact wear degrades signal integrity?
SAMTEC TST-series connectors with gold-plated phosphor bronze contacts are typically rated for a minimum of 50 insertion-withdrawal cycles before contact resistance exceeds specification, with many contacts maintaining performance well beyond 100 cycles under laboratory conditions. The 10 µin gold contact finish and phosphor bronze spring material are specifically chosen to extend mating life in test fixture and prototype board applications where connectors are frequently disconnected.
When specifying the TST-120-03-L-D for a production test fixture, what current and voltage ratings should engineers verify?
SAMTEC TST-series headers on 2.54 mm pitch typically support 1 A to 3 A per contact at standard ambient temperatures, depending on connector configuration and conductor gauge used in the mating cable assembly. Designers should verify that the total current load across all 40 positions does not exceed the connector's cumulative thermal derating limits, and that signal voltages remain below the 250 V AC working voltage typically specified for this connector family to ensure safe operation in test environments.
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About SAMTEC
SAMTEC is a leading electronic component manufacturer. FindMyChip sources SAMTEC ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $4.8500 | $4.85 |
| 2+ | $4.8460 | $9.69 |
| 50+ | $4.3150 | $215.75 |
| 100+ | $4.1090 | $410.90 |
| 500+ | $3.2350 | $1617.50 |
| 1000+ | $2.7313 | $2731.33 |
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