HW-31-16-G-D-250-SM

FAQFrequently Asked Questions

• Can the HW-31-16-G-D-250-SM be used in a design that requires frequent mating and de-mating cycles? The HW-31-16-G-D-250-SM features gold-plated contacts with a 10.0µin (0.25µm) finish and a 0.100" (2.54mm) pitch in the Flex Stack series, which is designed to accommodate moderate cycling. However, the gold plating thickness is relatively thin, so repeated mating cycles may eventually expose base metal if contacts experience abrasive wear. For applications requiring hundreds of connection cycles, evaluate contact wear patterns in your specific mating connector type and consider designs that minimize side-load forces during insertion and removal.
• What stack height considerations apply when integrating the HW-31-16-G-D-250-SM into a multi-layer PCB assembly? The HW-31-16-G-D-250-SM has a stack height of 0.250" (6.350mm) with a mating post length of 0.130" (3.302mm). When designing for stacked or backplane applications, verify that the overall assembly height (PCB thickness plus component height) does not violate enclosure constraints or cause mechanical interference with adjacent boards or daughter cards. The 0.100" (2.54mm) row spacing also means the 62-position layout spans approximately 3.1 inches across two rows, so ensure your PCB routing and layer stackup accommodate both the horizontal footprint and vertical clearance requirements.
• Is the HW-31-16-G-D-250-SM suitable as a direct drop-in replacement for legacy dual-row 62-position connectors from other manufacturers? The HW-31-16-G-D-250-SM uses a 0.100" (2.54mm) pitch and 0.100" row spacing, which aligns with historical standards. However, compatibility depends on the specific legacy connector model—older connectors may have different contact geometries, post lengths, mating force profiles, or gold plating specifications. Before committing to a replacement design, obtain detailed mechanical drawings and contact specifications from both the original part and the HW-31-16-G-D-250-SM to verify mating with existing cable assemblies or fixtures. Test a prototype mating cycle to confirm acceptable insertion force and electrical continuity.
• What surface mount assembly considerations apply to the HW-31-16-G-D-250-SM during reflow soldering? The HW-31-16-G-D-250-SM is a surface mount component with a 62-position footprint and 0.100" pitch, presenting a large solder joint area. During reflow, ensure adequate solder paste coverage on all pads to achieve robust solder fillets and minimize opens or cold joints, especially for inner pins that are harder to inspect visually. The component's thermal mass may require adjustment to reflow profile timing to prevent thermal shock or insufficient wetting. Verify that your PCB design includes adequate thermal vias and copper plane connectivity to support even heat distribution across all 62 pads, and consider x-ray inspection for inner rows to validate solder joint quality.
• How does the HW-31-16-G-D-250-SM perform in industrial environments with temperature cycling or high humidity exposure? The HW-31-16-G-D-250-SM is rated MSL 1 (Unlimited), indicating no moisture sensitivity limitations for storage and handling. Its gold-plated contacts resist corrosion in humid environments compared to bare copper. However, in industrial settings with frequent temperature cycling (e.g., -40°C to +85°C), the solder joints and PTH substrate experience expansion and contraction stress; the dual-row configuration concentrates mechanical stress at the outer edges of the large footprint. For long-term reliability in harsh industrial or automotive environments, perform thermal cycle testing on your specific board design, evaluate potting or conformal coating to protect against moisture ingress, and consider gold flash degradation timelines if the connector remains unmated for extended periods.
• What electrical noise or cross-talk considerations arise from the HW-31-16-G-D-250-SM's dual-row 0.100" pitch layout? The 0.100" (2.54mm) pitch and dual-row configuration place 62 signal paths in close proximity, increasing capacitive coupling and potential cross-talk, especially for high-speed signals (>10 MHz). The HW-31-16-G-D-250-SM does not include integral shielding or guard traces, so signal integrity depends on your PCB layer stackup design, trace routing discipline, and return path connectivity. If the connector carries mixed-voltage signals (analog, digital, power), segregate signal groups and provide dedicated ground return paths adjacent to each signal row. For high-speed applications, consider single-row alternatives or external shielding to mitigate inter-channel coupling.
• Can the HW-31-16-G-D-250-SM accommodate high-current or mixed voltage assignments across its 62 positions? The HW-31-16-G-D-250-SM contacts are rated for standard logic-level currents per Samtec specifications (typically 1-3 A per contact depending on contact material and solder joint design). If your application requires power distribution on selected positions, calculate voltage drop across the post length (0.130" / 3.302mm) and solder joint resistance; cumulative drop across multiple high-current contacts can degrade regulated supplies. Mixed voltage assignment (e.g., 3.3V logic and 12V power) is feasible, but requires careful pad layout, layer stackup, and net separation to prevent capacitive coupling. Validate current and thermal limits with Samtec technical support if average current per contact exceeds 0.5 A.
• What migration path exists if a design currently using the HW-31-16-G-D-250-SM needs to transition to a smaller pitch or higher density connector? The HW-31-16-G-D-250-SM's 0.100" pitch is a mature standard, but smaller-pitch alternatives (0.050" or 0.075") exist from Samtec and competitors, offering higher density in less board space. Transitioning to a smaller pitch requires complete PCB redesign (new footprints, updated routing rules, tighter trace clearances), changes to mating cable assemblies, and potential impact on assembly process windows (finer pitch increases solder joint difficulty). Alternatively, if density is the concern, evaluate stacking multiple HW-31-16-G-D-250-SM connectors vertically or repositioning connectors to unused board edges rather than redesigning to a finer pitch, unless the cost and schedule savings justify the engineering effort.
• How should the HW-31-16-G-D-250-SM be stored and handled to prevent contact corrosion or contamination before assembly? The HW-31-16-G-D-250-SM is RoHS3 compliant with MSL 1 rating, meaning it has no humidity or temperature storage limits. However, the gold-plated contacts can accumulate dust, solder flux residue, or oxidation if exposed to workshop air. Store components in sealed, dry bags with desiccant when possible. Before assembly, verify that PCB pads and solder paste are clean and free of flux bridges or contamination that could prevent good solder wetting. If the connector sits on the PCB for extended periods before mating, consider cleaning the contact posts with isopropyl alcohol and a soft brush just before first mating to ensure reliable contact resistance and minimize early-life mating force anomalies.
• What design trade-offs apply if a cable assembly connector (e.g., shrouded header or D-sub backshell) must mate with the HW-31-16-G-D-250-SM? The HW-31-16-G-D-250-SM has a 0.130" (3.302mm) mating post length and 0.100" pitch with no integral keying or polarization features. When specifying a mating cable connector, ensure post depth and contact geometry are compatible; a mismatch results in shallow mating, poor contact pressure, and intermittent electrical faults. Some shrouded headers or standard D-sub connectors have different post depths or contact spring tensions, potentially causing under- or over-mating. Validate mating force (insertion and withdrawal) in your design to confirm it falls within acceptable limits for manual or automated systems. If polarization is critical, design a mechanical keying feature (e.g., mounting pin or asymmetric pad layout) into the PCB to prevent incorrect orientation.
• Is the HW-31-16-G-D-250-SM rated for use in aerospace, medical, or automotive applications that require traceability or screening? The HW-31-16-G-D-250-SM is RoHS3 compliant and carries an ECCN classification (EAR99), indicating standard commercial availability. However, aerospace, medical, and automotive applications typically require component qualification, source inspection, lot traceability, and screening tests (e.g., thermal shock, vibration, salt spray) that may not be standard in commercial supply chains. Contact Samtec directly to inquire about availability of screened lots, certificates of conformance, or alternative part numbers in higher-reliability series (e.g., Samtec's QT or other aerospace-qualified lines). For critical applications, budget lead time for third-party screening or qualification testing of commercial lots.
• What are the pin count and electrical isolation considerations if the HW-31-16-G-D-250-SM carries both digital control signals and analog sensor inputs? The HW-31-16-G-D-250-SM provides 62 positions arranged in two rows of 31 contacts each. If the design multiplexes digital (e.g., SPI, I2C at 5V) and analog (e.g., sensor inputs at 3.3V or millivolt-level) signals through the same connector, cross-talk and common-mode noise become critical. The lack of internal shielding means external mitigation—separate ground returns, filtering capacitors near the connector pins, and careful layer stackup (ground planes adjacent to both signal and analog rows)—is essential. Consider dedicating one row to analog and one to digital, or using only the minimum required positions and leaving unused positions as ground or shielding buffers. Layout validation with signal integrity simulation (e.g., SPICE or 3D EM) is strongly recommended before first prototype.
• How does the HW-31-16-G-D-250-SM compare to Samtec's other stackable header options such as the TSM or TST series for board-to-board applications? The HW-31-16-G-D-250-SM is part of the Flex Stack (HW) series and is optimized for moderate-density, 0.100" pitch applications where board-to-board spacing can tolerate the 0.250" (6.350mm) stack height. The TSM series offers higher density and lower profile for tighter board spacing, while TST connectors support different mating geometries and stack heights. If your application requires multiple stacked boards with minimal vertical clearance, TSM may offer space savings; if contact cycling is frequent, TSM's engineering may provide better wear characteristics. Compare mechanical drawings, contact materials, and application notes from each series against your specific space, mating cycle, and reliability requirements.
• What post-assembly rework or repair considerations apply if a solder joint on the HW-31-16-G-D-250-SM must be corrected? The HW-31-16-G-D-250-SM's 62-position surface mount footprint presents rework challenges, especially for inner pins on the dual-row layout. Resoldering a single failed joint risks thermal damage to adjacent solder connections and flux migration affecting neighboring pins. If a joint must be reworked, use localized heat (rework station or micro-soldering iron) rather than oven reflow to minimize thermal stress on the entire component. Inspect neighboring pins with x-ray or thermal imaging after rework. If multiple joints fail, consider desoldering the entire connector and replacing it rather than attempting piecemeal repair, to avoid cascading failures and ensure board reliability. Document rework procedures and validate with test matings before returning the board to service.
• What considerations apply when designing test fixtures or harnesses that mate with the HW-31-16-G-D-250-SM during manufacturing or field troubleshooting? The HW-31-16-G-D-250-SM's 0.100" pitch and 62-position configuration require precision test fixture design with accurate pin alignment and adequate contact pressure to ensure reliable make-and-break cycles over the fixture lifetime. Fixture contacts must accommodate the 0.130" (3.302mm) post length and apply repeatable force; under-engagement produces measurement noise or false negatives, while over-engagement accelerates contact wear. Design test fixtures with guidance pins, alignment features, or spring-loaded carriages to ensure repeatable mating geometry. If the fixture will undergo hundreds of mating cycles, specify contact materials and springs rated for the intended service life, and validate fixture contact resistance at the beginning, middle, and end of production to detect wear trends.