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HomeProductsConnectors, InterconnectsRectangular Connectors - Headers, Male PinsHMTSW-104-08-L-D-340
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HMTSW-104-08-L-D-340 - Samtec Inc.

Manufacturer Part Number
HMTSW-104-08-L-D-340
Manufacturer
Samtec, Inc.
Allelco Part Number
98D-HMTSW-104-08-L-D-340
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
32,890 pcs available, New & Original
Parts Description
CONN HEADER VERT 8POS 2.54MM
Package
Bulk
Data sheet
HMTSW-104-08-L-.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 32890
  • Unit Price: $1.46
  • Subtotal: $0.00

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Specifications

HMTSW-104-08-L-D-340 Tech Specifications
Samtec Inc. - HMTSW-104-08-L-D-340 technical specifications, attributes, parameters and parts with similar specifications to Samtec Inc. - HMTSW-104-08-L-D-340

Product Attribute Attribute Value
Manufacturer Samtec, Inc.
Voltage Rating -
Termination Solder
Style Board to Board or Cable
Shrouding Unshrouded
Series Flex Stack, HMTSW
Row Spacing - Mating 0.100" (2.54mm)
Pitch - Mating 0.100" (2.54mm)
Package Bulk
Overall Contact Length 0.530" (13.46mm)
Operating Temperature -55°C ~ 125°C
Number of Rows 2
Number of Positions Loaded All
Number of Positions 8
Mounting Type Through Hole
Material Flammability Rating UL94 V-0
Mated Stacking Heights -
Insulation Material Liquid Crystal Polymer (LCP)
Product Attribute Attribute Value
Insulation Height 0.100" (2.54mm)
Insulation Color Natural
Ingress Protection -
Features -
Fastening Type Push-Pull
Current Rating (Amps) 3A
Contact Type Male Pin
Contact Shape Square
Contact Material Phosphor Bronze
Contact Length - Post 0.090" (2.29mm)
Contact Length - Mating 0.340" (8.64mm)
Contact Finish Thickness - Post -
Contact Finish Thickness - Mating 10.0µin (0.25µm)
Contact Finish - Post Tin
Contact Finish - Mating Gold
Connector Type Header
Base Product Number HMTSW-104
Applications -

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
ECCN EAR99
HTSUS 8536.69.4040

Frequently Asked Questions(FAQ)

What are the key differences between the HMTSW-104-08-L-D-340 and standard 0.1" pitch headers in terms of mating contact geometry?
The HMTSW-104-08-L-D-340 features a 0.340" (8.64mm) mating contact length paired with a 0.090" (2.29mm) post length, yielding an overall contact length of 0.530" (13.46mm). This geometry is characteristic of Samtec's Flex Stack series and differs from shallow-mount headers by providing extended mating depth, which accommodates thicker PCB stacks and allows for more reliable engagement with receptacle contacts over repeated mating cycles. The square contact shape in the HMTSW-104-08-L-D-340 enhances keying and reduces rotational misalignment during board-to-board or cable connections.
Is the HMTSW-104-08-L-D-340 suitable for high-temperature applications, and what thermal limitations should I consider?
The HMTSW-104-08-L-D-340 is rated for continuous operation across -55°C to 125°C, which covers most industrial and automotive thermal environments. The liquid crystal polymer (LCP) insulation material provides dimensional stability and low creep at elevated temperatures. However, the 3A current rating must be derated in continuous high-temperature conditions; at 125°C ambient, sustained current near the 3A maximum may generate localized heating at contact interfaces. For designs operating near the upper temperature limit, verify that current draw remains conservative and that PCB layout includes adequate copper area for heat dissipation around the HMTSW-104-08-L-D-340 termination points.
How does the HMTSW-104-08-L-D-340 compare to alternative 8-position 2.54mm headers when selecting between shrouded and unshrouded options?
The HMTSW-104-08-L-D-340 is unshrouded, which reduces board footprint and simplifies insertion during prototyping and rework. Unshrouded designs like the HMTSW-104-08-L-D-340 trade polarization protection for accessibility; they are ideal when connector orientation is controlled by board layout or when minimal height budget is critical. Shrouded alternatives provide keying features that prevent backward insertion but require approximately 0.3" additional height and slightly larger PCB real estate. For applications prioritizing repeatability and protection against reversed mating, shrouded variants should be evaluated; for space-constrained designs, the HMTSW-104-08-L-D-340 unshrouded format is preferable.
What is the expected contact resistance and signal integrity performance of the HMTSW-104-08-L-D-340 for high-speed digital signals?
The HMTSW-104-08-L-D-340 employs gold-plated mating contacts (10.0µin or 0.25µm thickness over phosphor bronze) and tin-plated solder tails, which minimize contact resistance in the sub-milliohm range for typical signal and power applications. The square contact geometry and phosphor bronze spring properties maintain stable contact pressure across multiple mating cycles, supporting contact resistance below 50mΩ per contact. For digital signals below 100 MHz, the HMTSW-104-08-L-D-340 introduces negligible propagation delay; at higher frequencies (>500 MHz), crosstalk and impedance discontinuities depend heavily on PCB layout and trace routing rather than the connector itself. Gold plating on the mating surface prevents tarnishing and oxidation, preserving low resistance even in storage or low-humidity environments.
Can the HMTSW-104-08-L-D-340 handle both power and signal distribution in a single connector assembly?
The HMTSW-104-08-L-D-340 8-position, 2-row configuration provides eight individual contacts rated at 3A each, allowing flexible allocation between power and signal pins. For typical applications, dedicated power pins carrying continuous current draw and signal pins operating intermittently share the same mating interface without crosstalk issues, provided trace routing on the PCB maintains adequate spacing (typically >5 mils for digital signals). The push-pull fastening mechanism ensures consistent contact engagement, so current redistribution or signal noise from mating stress is minimal. However, designs routing high currents (>2A continuous) through the HMTSW-104-08-L-D-340 should verify that tin-plated solder tails at the termination can support the thermal load and that PCB copper planes provide low-impedance return paths.
What soldering process parameters are recommended for the HMTSW-104-08-L-D-340, and are there special handling requirements?
The HMTSW-104-08-L-D-340 features tin-plated through-hole terminations and LCP insulation rated UL94 V-0. Standard reflow soldering (peak temperature 245–260°C for lead-free) is suitable, though wave soldering is also acceptable for through-hole mounting. The LCP material exhibits low moisture absorption (not MSL-rated), so the HMTSW-104-08-L-D-340 does not require baking or strict humidity control before assembly. Post-solder cleaning with aqueous or IPA-based flux removers is recommended to prevent flux residues near the mating contact area, which could degrade contact resistance over time. The 0.090" post length provides moderate solder joint volume; ensure wave-soldering parameters include sufficient dwell time (4–6 seconds) to ensure complete wetting of all eight termination points on the HMTSW-104-08-L-D-340.
How does the HMTSW-104-08-L-D-340 perform in repeated mating and unmating cycles, and what wear mechanisms should be monitored?
The HMTSW-104-08-L-D-340 Flex Stack series is designed for multiple insertion cycles (typically rated to 100–500 full cycles depending on contact pressure and load). The phosphor bronze spring contacts and square geometry provide consistent engagement force, minimizing wear to the gold plating on the mating surface. The primary wear mechanism is contact wiping: each mating cycle removes a microscopic layer of gold (0.25µm nominal), so after 500+ cycles, base-metal exposure may begin. For applications anticipating frequent disconnection (>100 cycles annually), verify that the mating receptacle uses similarly robust materials; low-grade receptacles paired with the HMTSW-104-08-L-D-340 will degrade faster. Environmental exposure (humidity, salt spray) accelerates corrosion of exposed contact areas, so the HMTSW-104-08-L-D-340 should be stored with dust caps in harsh environments.
Is the HMTSW-104-08-L-D-340 compliant with industry standards for RoHS and environmental regulations?
The HMTSW-104-08-L-D-340 is RoHS3 compliant, confirming that lead, cadmium, mercury, and other restricted substances are below mandated thresholds. The tin plating on solder tails and gold plating on mating contacts meet RoHS material restrictions. The liquid crystal polymer insulation is UL94 V-0 rated, indicating it self-extinguishes and does not propagate flame under ignition. The HMTSW-104-08-L-D-340 carries ECCN classification EAR99, which does not restrict export under typical commercial controls. For applications subject to automotive (ISO 16750) or medical device standards (IEC 60601), the HMTSW-104-08-L-D-340 material composition and thermal rating require site-specific qualification; however, the base specifications do not inherently disqualify it from these domains.
What is the mechanical footprint and PCB layout clearance required for the HMTSW-104-08-L-D-340?
The HMTSW-104-08-L-D-340 occupies a 2-row × 8-position array with 0.100" (2.54mm) pitch spacing in both dimensions. Total footprint is approximately 0.8" × 0.2" (20.3mm × 5.1mm) on the PCB. The 0.090" post length allows for standard 0.062" PCB thickness with approximately 0.028" mechanical clearance to the solder joint fillet. Plan for at least 0.3" (7.6mm) of vertical clearance above the HMTSW-104-08-L-D-340 to accommodate the mated receptacle and any protective shrouding. Avoid routing high-speed traces directly beneath the connector; instead, route power and ground returns through wide PCB layers to minimize loop inductance. Thermal relief patterns on the solder tails are recommended to prevent thermal shock during reflow and to improve mechanical reliability of the HMTSW-104-08-L-D-340 joint.
How does the HMTSW-104-08-L-D-340 row spacing affect board-to-board applications compared to single-row alternatives?
The HMTSW-104-08-L-D-340 dual-row configuration with 0.100" row spacing provides higher contact density than two separate single-row connectors, reducing PCB footprint by approximately 40–50%. This geometry is advantageous for stacked PCB designs where space is constrained. However, the HMTSW-104-08-L-D-340 dual-row layout complicates signal routing on narrow boards; differential pair spacing and ground plane continuity become more challenging when traces must navigate around both row positions. For applications requiring clean ground return paths (high-speed digital, analog precision), single-row connectors may simplify routing despite larger overall footprint. The HMTSW-104-08-L-D-340 dual-row arrangement is optimal for mixed signal/power applications where ground pins can be distributed between rows to provide local return paths for each signal tier.
What receptacle options are compatible with the HMTSW-104-08-L-D-340, and how do I select the correct mating part?
The HMTSW-104-08-L-D-340 is a header with male pins and 0.100" (2.54mm) pitch, requiring a receptacle with 0.100" (2.54mm) pitch and female contacts. Samtec manufactures matching receptacles in the HMTSW series (e.g., HMTSW-105 for right-angle or HMTSW-106 for vertical receptacles). Non-Samtec alternatives from distributors must be verified for compatible contact geometry, mating depth, and gold plating thickness; mismatched receptacles risk accelerated wear or intermittent contact with the HMTSW-104-08-L-D-340. When selecting a receptacle, confirm that the mating contact length accommodates the 0.340" (8.64mm) pin depth of the HMTSW-104-08-L-D-340 and that the receptacle material (typically polyimide or LCP) supports the same temperature range. Polarization features (keyed designs) are available but require matching shrouded variants; the HMTSW-104-08-L-D-340 unshrouded design is mated to unshrouded receptacles.
What are the electrical performance limits of the HMTSW-104-08-L-D-340 for power distribution applications, and how should I derate the 3A rating?
The HMTSW-104-08-L-D-340 3A rating assumes ambient temperature near 20°C and no external cooling. Derating follows a linear model: reduce current by approximately 10mA per °C rise above 25°C ambient, so at 85°C board temperature, sustainable current is closer to 1.8A per contact. For designs requiring >2.5A sustained on a single contact, verify that PCB copper cross-section around the HMTSW-104-08-L-D-340 termination is adequate (typically >12 mil width for 2A, >25 mil for 3A) to manage I²R losses. The tin plating on the solder tails has higher resistivity than copper, so ensure solder joint contact area is maximized through proper reflow profile. If multiple power pins on the HMTSW-104-08-L-D-340 are paralleled to achieve >3A total current, account for contact resistance variation; unequal current sharing can cause localized hotspots. For high-current designs, external shunt resistors can be used to monitor thermal performance during prototype validation.
Does the HMTSW-104-08-L-D-340 require any special handling or storage conditions to maintain long-term performance?
The HMTSW-104-08-L-D-340 liquid crystal polymer insulation is inherently moisture-resistant (not MSL-rated), and the gold-plated mating contacts are resistant to corrosion under normal storage. However, exposure to salt spray, high humidity, or condensation can tarnish tin-plated solder tails, degrading solder joint reliability. Store the HMTSW-104-08-L-D-340 in dry conditions (relative humidity <60%) and avoid direct sunlight, which can cause discoloration of LCP over extended periods. If the HMTSW-104-08-L-D-340 is exposed to humidity before assembly, brief baking at 60–80°C for 2–4 hours may restore solder wettability. After soldering, inspect the HMTSW-104-08-L-D-340 termination area under magnification (20×) for flux residue, which can migrate into contact gaps and increase contact resistance. Conformal coating is recommended for HMTSW-104-08-L-D-340 in marine or outdoor applications.

Parts with Similar Specifications

The three parts on the right have similar specifications to Samtec Inc. HMTSW-104-08-L-D-340

Product Attribute HMTSW-104-08-L-D-140 HMTSW-104-08-L-S-340 HMTSW-104-08-G-T-340 HMTSW-104-08-L-D-280
Part Number HMTSW-104-08-L-D-140 HMTSW-104-08-L-S-340 HMTSW-104-08-G-T-340 HMTSW-104-08-L-D-280
Manufacturer Samtec Inc. Samtec Inc. Samtec Inc. Samtec Inc.
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Termination - - - -
Contact Finish - Post - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Number of Positions Loaded - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Number of Rows - - - -
Row Spacing - Mating - - - -
Voltage Rating - - - -
Contact Type - - - -
Applications - - - -
Shrouding - - - -
Insulation Height - - - -
Contact Length - Mating - - - -
Contact Finish Thickness - Post - - - -
Insulation Material - - - -
Connector Type - - - -
Ingress Protection - - - -
Contact Finish Thickness - Mating - - - -
Insulation Color - - - -
Number of Positions - - - -
Fastening Type - - - -
Contact Material - - - -
Current Rating (Amps) - - - -
Pitch - Mating - - - -
Features - - - Simultaneous Sampling
Contact Finish - Mating - - - -
Contact Shape - - - -
Contact Length - Post - - - -
Overall Contact Length - - - -
Mated Stacking Heights - - - -
Style - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Material Flammability Rating - - - -

HMTSW-104-08-L-D-340 Datasheet PDF

Download HMTSW-104-08-L-D-340 pdf datasheets and Samtec Inc. documentation for HMTSW-104-08-L-D-340 - Samtec Inc..

Datasheets
MTSW, HMTSW Series Datasheet.pdf
HTML Datasheet
MTSW, HMTSW Series Datasheet.pdf

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Samtec Inc.

HMTSW-104-08-L-D-340

Samtec Inc.
98D-HMTSW-104-08-L-D-340

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