TSM-121-04-L-DH-A-K-TR SAMTEC Connector (Other) In Stock
SAMTEC TSM-121-04-L-DH-A-K-TR is a 42-position dual-row surface-mount terminal strip with 0.100" (2.54 mm) pitch and a low-profile double-height housing, designed for robust board-to-board and wire-to-board interconnection. Long post variant with keying and SMT termination supports automated assembly and positive locking in industrial applications. Available from authorized distributors with worldwide shipping.
- Manufacturer
- SAMTEC
- Package
- Other
- Pin Count
- 42
- Lifecycle
- ACTIVE
- Datasheet
- TSM-121-04-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-121-04-L-DH-A-K-TR?
- 42-position dual-row terminal strip at 2.54 mm (0.100 inch) pitch for versatile high-pin-count signal and power board connections
- Double-height (DH) housing provides additional PCB clearance, accommodating larger wire bundles and cable assemblies in industrial designs
- Long post (L) design enables mating with both standard-height and raised mating connectors for flexible stack height options
- Keying (K) feature prevents incorrect orientation during mating, reducing assembly errors in 42-position high-density connectors
What is TSM-121-04-L-DH-A-K-TR used for?
The TSM-121-04-L-DH-A-K-TR serves industrial automation controllers, power distribution boards, and embedded computing expansion modules requiring a 42-pin 2.54 mm pitch SMT terminal strip. The keyed double-height housing is particularly beneficial in field-serviceable equipment such as PLCs and motor drive panels, where frequent connector mating and unmating must be reliable and orientation-safe over the equipment's operational life.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the TSM-121-04-L-DH-A-K-TR datasheet?
TSM-121-04-L-DH-A-K-TR Datasheet DownloadOfficial datasheet from SAMTEC
What are equivalent replacements for TSM-121-04-L-DH-A-K-TR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does the double-height designation mean for the TSM-121-04-L-DH-A-K-TR in a cable-dense installation?
The double-height (DH) designation indicates that the TSM-121-04-L-DH-A-K-TR connector housing extends further above the PCB than a standard-height version, typically adding several millimeters of clearance. In industrial control panels with 42 wires exiting a single connector, this extra height allows thicker wire insulation and strain-relief accessories to fit without bending stress on individual contacts or soldered pads.
How does the keying (K) option on the TSM-121-04-L-DH-A-K-TR prevent mating errors in field service?
The keying feature on the TSM-121-04-L-DH-A-K-TR introduces a mechanical polarization element that allows mating only in the correct orientation. For a 42-position dual-row connector at 2.54 mm pitch, accidental reversal could misconnect 21 signal pairs; the keying prevents this during field maintenance, even when technicians work in confined or poorly lit industrial enclosures.
Which automated PCB assembly process is suitable for the TSM-121-04-L-DH-A-K-TR?
The TSM-121-04-L-DH-A-K-TR features SMT termination pads at 2.54 mm pitch compatible with solder paste stencil printing and reflow oven processing. For a 42-position component, a precisely designed stencil aperture pattern ensures sufficient solder volume at each of the 42 pads while the long-post variant's mechanical stability assists automated pick-and-place placement accuracy.
When is the TSM-121-04-L-DH-A-K-TR a better fit than a through-hole terminal strip with the same 42-position count?
The SMT version eliminates the need for 42 drilled plated-through holes, saving PCB layer routing space underneath the connector and reducing drill cost in multilayer boards. For designs already using automated SMT assembly lines, the TSM-121-04-L-DH-A-K-TR avoids a separate wave-solder or hand-solder step, lowering production cost and cycle time compared to equivalent through-hole 2.54 mm pitch terminal strips.
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