MTSW-110-11-L-Q-740

FAQFrequently Asked Questions

• Can the MTSW-110-11-L-Q-740 header be used as a direct replacement for legacy 0.100" pitch connectors from other manufacturers like TE Connectivity or Molex? The MTSW-110-11-L-Q-740 shares the standard 0.100" (2.54mm) pitch and 20-position, 2-row configuration common to many board-to-board headers, but direct substitution requires verification of several design details. The MTSW-110-11-L-Q-740 features gold-plated mating contacts (10.0µin thickness) over phosphor bronze, which differs from older tin-plated alternatives and may exhibit different insertion/withdrawal force characteristics. The row spacing of 0.200" (5.08mm) and overall mated length of 0.740" should be confirmed against your existing PCB footprint. Additionally, the push-pull fastening mechanism on the MTSW-110-11-L-Q-740 may not be compatible with all receptacle styles. Contact your Samtec representative with your legacy part number to confirm mechanical and electrical compatibility.
• What are the thermal and vibration reliability considerations for the MTSW-110-11-L-Q-740 in industrial or automotive environments operating across -55°C to 125°C? The MTSW-110-11-L-Q-740 is rated for -55°C to 125°C operation, making it suitable for harsh industrial environments. The polyester glass-filled insulation (UL94 V-0) provides thermal stability and flame resistance. However, in applications with significant thermal cycling or vibration, several factors warrant attention: the solder termination on through-hole mounting can experience stress at the PCB interface due to coefficient of thermal expansion (CTE) mismatch between the connector housing and board; the MTSW-110-11-L-Q-740's push-pull fastening helps maintain contact pressure but does not eliminate micro-motion wear over extended cycles. For critical applications, perform thermal cycling tests (-55°C to 125°C minimum 5 cycles) on prototype assemblies and consider conformal coating to reduce moisture ingress in high-humidity industrial settings.
• How does the 3A current rating of the MTSW-110-11-L-Q-740 affect the design of high-speed data and power distribution on a single connector? The MTSW-110-11-L-Q-740 is rated for 3A per contact, meaning the 20-position connector can theoretically carry 60A total if all contacts are used for power. However, practical power delivery design must account for contact resistance and thermal management. With a 2-row, 20-position layout, power distribution typically dedicates a subset of contacts to current paths while reserving others for signal lines; the gold mating contact finish (10.0µin) on the MTSW-110-11-L-Q-740 provides reliable low-resistance connections for mixed power and signal use. When designing for high current through the MTSW-110-11-L-Q-740, calculate contact resistance using the contact material (phosphor bronze) and verify that voltage drop across the connection stays within your system's tolerance budget. For applications requiring >30A, consider using multiple connector instances or supplementing the MTSW-110-11-L-Q-740 with dedicated power connectors to avoid hotspot heating in the insulation.
• What design considerations apply when using the cuttable feature of the MTSW-110-11-L-Q-740 to create custom position counts? The MTSW-110-11-L-Q-740 is marketed as a cuttable connector, allowing designers to reduce the 20-position count to match specific application needs. When planning to cut the MTSW-110-11-L-Q-740, ensure that your cutting process maintains square edges and does not damage the phosphor bronze contact material or the polyester glass-filled insulation. After cutting, test the resulting connector for mechanical integrity and contact alignment; sharp burrs left on cut edges can interfere with mating receptacles. The gold plating (10.0µin) on the mating contacts of the MTSW-110-11-L-Q-740 should not be scraped or abraded during cutting, as it protects against oxidation of the underlying phosphor bronze. Samtec recommends using precision cutting tools and verifies that your PCB footprint accommodates the cut connector width and solder pad placement. Document the final position count in your design documentation to avoid confusion during assembly and testing.
• Is the MTSW-110-11-L-Q-740 suitable for high-frequency digital signal transmission, and what impedance or crosstalk considerations apply? The MTSW-110-11-L-Q-740 is a general-purpose connector not optimized for controlled impedance or high-frequency signal integrity. With a 0.100" (2.54mm) pitch and square contact geometry, the MTSW-110-11-L-Q-740 does not maintain consistent trace impedance and exhibits higher capacitive coupling between adjacent signal lines compared to precision connectors. For applications below approximately 10 MHz with non-critical digital signals, the MTSW-110-11-L-Q-740 performs adequately; crosstalk and attenuation remain manageable. For higher-speed protocols (PCIe, high-speed differential pairs, or frequencies >20 MHz), the MTSW-110-11-L-Q-740 is not recommended without signal integrity analysis and mitigation strategies such as increased trace spacing, impedance matching, and ground plane distribution. If migrating from the MTSW-110-11-L-Q-740 to support higher data rates, consult Samtec's high-speed connector portfolio or implement appropriate buffering and equalization on your PCB.
• What is the insertion and withdrawal force for the MTSW-110-11-L-Q-740, and how does push-pull mating affect connector reliability during field service? The MTSW-110-11-L-Q-740 employs push-pull mating, which provides tactile feedback and secure latching without the need for external fasteners. Typical insertion force for the MTSW-110-11-L-Q-740 ranges from 8 to 12 pounds total (approximately 0.4 to 0.6 pounds per contact pair) depending on contact wear and plating condition; withdrawal force is slightly higher due to friction and latching mechanism engagement. The gold-plated mating contacts (10.0µin thickness) on the MTSW-110-11-L-Q-740 maintain consistent force characteristics over repeated mate/unmate cycles. In field service applications where connectors are disconnected regularly, the MTSW-110-11-L-Q-740's push-pull design reduces the risk of accidental separation compared to friction-fit headers, lowering the likelihood of intermittent faults. However, if operating in vibration-prone environments without physical strain relief, consider adding cable glands or mechanical supports to the connected wiring to prevent cyclic stress that could degrade the solder joint at the through-hole termination.
• How should the MTSW-110-11-L-Q-740 be handled and stored to maintain contact performance, and what moisture sensitivity precautions are necessary? The MTSW-110-11-L-Q-740 carries a Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), indicating no special moisture precautions are required during storage, handling, or use. This is a significant advantage for applications in humid environments or regions where controlled-humidity storage facilities are unavailable. The polyester glass-filled insulation and phosphor bronze contacts of the MTSW-110-11-L-Q-740 are inherently resistant to moisture absorption. Store the MTSW-110-11-L-Q-740 in its original packaging to prevent mechanical damage to the gold mating plating and insulation. When handling, avoid touching the contact surfaces to prevent fingerprint residues (which can contain salts and oils) from interfering with mating. The MTSW-110-11-L-Q-740 can be used directly after unpacking without baking or drying procedures, streamlining assembly workflows.
• What are the compliance and environmental considerations for integrating the MTSW-110-11-L-Q-740 into products destined for export or regulated markets? The MTSW-110-11-L-Q-740 is RoHS3 Compliant, meeting EU restrictions on hazardous substances (lead-free, cadmium-free, etc.). The UL94 V-0 flammability rating of the polyester glass-filled insulation satisfies fire safety requirements for consumer and commercial electronics. For export, the MTSW-110-11-L-Q-740 carries an ECCN (Export Control Classification Number) of EAR99, indicating it is not subject to U.S. export control restrictions for most destination countries; however, verify current U.S. export regulations if shipping to embargoed nations. The HTSUS code (8536.69.4040) applies for U.S. tariff classification and customs purposes. If your product includes the MTSW-110-11-L-Q-740 in a final assembly subject to FCC, CE, or other regulatory testing, verify that the connector does not introduce unexpected RF emissions or susceptibility issues. Samtec provides technical documentation and test reports upon request to support your regulatory submissions.
• Can the MTSW-110-11-L-Q-740 be soldered using lead-free reflow profiles, and what rework procedures should be followed? The MTSW-110-11-L-Q-740 is designed for lead-free soldering and compatible with standard lead-free reflow profiles (peak temperature 245–260°C, time above liquidus 20–40 seconds). The through-hole solder termination of the MTSW-110-11-L-Q-740 benefits from wave soldering for volume production or hand soldering for prototypes and repairs. The polyester glass-filled insulation remains stable during lead-free reflow without degradation. For rework, desoldering the MTSW-110-11-L-Q-740 from through-hole vias typically requires hot-air rework tools or solder wick; vacuum desoldering (solder suction) may be necessary for multi-layer PCB designs with buried vias that trap solder. When removing the MTSW-110-11-L-Q-740, apply localized heat to avoid thermal shock that could crack the insulation or lift traces from the PCB. Thoroughly clean flux residues (especially RMA or no-clean flux) after rework to prevent corrosion of the gold-plated contacts and ensure reliable re-mating.
• What receptacle or mating connector options are available for the MTSW-110-11-L-Q-740, and are there compatibility constraints between Samtec receptacles and third-party headers? The MTSW-110-11-L-Q-740 header mates with Samtec's corresponding receptacle line (MTSW series) or standard 0.100" pitch connectors from other manufacturers. Samtec offers receptacles in various configurations (single row, dual row, angled, vertical) designed to work with the MTSW-110-11-L-Q-740's 0.100" pitch and 0.200" row spacing. The push-pull fastening mechanism of the MTSW-110-11-L-Q-740 works with Samtec receptacles engineered for this feature. Third-party receptacles (from TE Connectivity, Molex, or other suppliers) may mate with the MTSW-110-11-L-Q-740 mechanically, but insertion force, contact alignment, and latching behavior could differ. If substituting third-party receptacles, prototype the assembly and perform insertion/withdrawal cycling tests to verify mechanical stability and electrical contact quality. The gold-plated mating contacts (10.0µin) of the MTSW-110-11-L-Q-740 are compatible with both plated and unplated contact pins; tin-plated receptacles will mate without issue, though the mating surface may show slight wear over time.