TSM-121-03-L-DH-A-K-TR SAMTEC Connector (Other) In Stock
SAMTEC TSM-121-03-L-DH-A-K-TR is a 42-position dual-row SMT terminal strip at 0.100" (2.54 mm) pitch with a long-post double-height housing and keying for reliable orientation-safe mating. Designed for industrial and commercial board-to-board signal interconnection with surface-mount termination supporting automated reflow assembly. Available from global authorized distributors with fast worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 42
- Lifecycle
- ACTIVE
- Datasheet
- TSM-121-03-L-DH-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 TSM-121-03-L-DH-A-K-TR?
- 42-position dual-row SMT terminal strip at 2.54 mm (0.100 inch) pitch for scalable, high-density board-to-board interconnection
- Long-post (L) contact design enables compatibility with varied mating connector stack heights in modular board systems
- Double-height (DH) housing increases clearance above the PCB to accommodate thicker cables and strain-relief accessories
- Keyed (K) polarization prevents incorrect mating orientation across all 42 positions, reducing assembly errors in production and field service
What is TSM-121-03-L-DH-A-K-TR used for?
The TSM-121-03-L-DH-A-K-TR is suited for modular embedded computing boards, industrial PLC expansion interfaces, and power distribution panels where a keyed 42-pin 2.54 mm pitch SMT terminal strip is needed. Its long-post double-height design and keying make it a practical choice for field-serviceable equipment in automation and process control, ensuring correct mating under harsh conditions or limited visibility.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the TSM-121-03-L-DH-A-K-TR datasheet?
TSM-121-03-L-DH-A-K-TR Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for TSM-121-03-L-DH-A-K-TR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the long-post (L) variant of the TSM-121-03-L-DH-A-K-TR differ from a standard-post version?
The long-post (L) designation means the contact posts extend further above the housing than in standard-length variants, typically by 1 mm to 3 mm. This allows the TSM-121-03-L-DH-A-K-TR to mate with socket connectors that have deeper receptacles or additional spacers between boards, offering flexible stack height options in multilayer board assemblies at 2.54 mm pitch.
For which industrial control applications is the TSM-121-03-L-DH-A-K-TR especially suitable?
The TSM-121-03-L-DH-A-K-TR's 42-position dual-row layout at 2.54 mm pitch, combined with keying and a double-height housing, is especially useful in PLC I/O expansion boards, motor drive interface cards, and industrial relay modules. These applications typically need many signal lines in a single connector with reliable polarity locking, and the SMT termination supports high-volume automated assembly.
Can the TSM-121-03-L-DH-A-K-TR be used interchangeably with the TSM-121-04-L-DH-A-K-TR?
Both the TSM-121-03-L-DH-A-K-TR and TSM-121-04-L-DH-A-K-TR are 42-position dual-row SMT terminal strips at 2.54 mm pitch with keying and double-height housing, but the numeric code segment (03 vs 04) indicates a different contact finish or plating specification. Designers should verify the finish code in SAMTEC's part numbering guide to confirm electrical compatibility before substituting one for the other in production.
What solder joint reliability considerations apply to reflow assembly of the TSM-121-03-L-DH-A-K-TR?
With 42 SMT solder joints at 2.54 mm pitch, thermal mass distribution across the connector body can affect joint uniformity during reflow. SAMTEC recommends using a validated solder paste stencil aperture sized for the specific pad geometry and a reflow profile with adequate soak time to equilibrate temperature across all 42 pads before reaching the liquidus point, typically around 217°C for SAC305 lead-free solder.
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