ESC19DREH-S13

FAQFrequently Asked Questions

• What are the key design constraints when integrating the ESC19DREH-S13 into a PCB layout, particularly regarding card thickness and mounting clearance? The ESC19DREH-S13 is designed for 0.062" (1.57mm) card thickness with a dual-edge, straddle-mount configuration. The connector features a top-mount opening with 0.125" (3.18mm) diameter unthreaded holes. During PCB layout, ensure adequate clearance around the mounting holes and verify that your card stock matches the 0.062" specification—cards thicker or thinner than this will result in improper contact pressure and potential signal integrity issues. The solder eyelets require through-hole PCB design, so plan your via strategy to avoid conflicts with the eyelet landing patterns.
• Can the ESC19DREH-S13 reliably support high-speed differential signaling, or is it better suited for lower-frequency applications? The ESC19DREH-S13, with its phosphor bronze contacts finished in gold and full bellows contact design, is capable of supporting moderate-speed digital and analog signals. However, for high-speed differential signaling (exceeding 100 MHz), the dual-edge configuration and 0.100" (2.54mm) pitch introduce parasitic inductance and crosstalk concerns. If your application requires differential pairs, route them symmetrically and consider the connector's contact-to-ground plane distance carefully. For applications above 200 MHz, evaluate connectors with tighter pitch and controlled impedance characteristics. The ESC19DREH-S13 performs well in legacy systems and general-purpose I/O applications where signal integrity demands are moderate.
• What is the expected contact resistance and operating current per contact for the ESC19DREH-S13, and how does this affect power distribution designs? The ESC19DREH-S13 uses phosphor bronze contacts with gold finish (10.0µin thickness) and full bellows design, which typically yield contact resistance in the range of 10–20 mΩ under normal wiping. Each contact can handle standard digital logic currents (typically 1–2 A for TTL/CMOS applications) without thermal issues in continuous operation. For power distribution, the 38-position configuration across 19 positions per row allows parallel current paths, but do not assume even current distribution across all contacts. If distributing high currents (>5 A total), dedicate multiple contacts to power and ground, and verify that your PCB trace sizing supports the current density. The connector's operating temperature range of -65°C to 125°C means resistance will increase at temperature extremes; budget an additional 10–15% contact resistance rise at -65°C.
• How does the ESC19DREH-S13 compare to 0.156" pitch edge connectors for applications requiring higher contact density, and what are the trade-offs? The ESC19DREH-S13 operates at 0.100" (2.54mm) pitch, offering 19 positions per row in a compact dual-edge footprint. Connectors with 0.156" pitch (such as certain DIN 41612 variants) provide lower contact density but allow larger contact cross-sections and slightly lower insertion/extraction forces. The ESC19DREH-S13's smaller pitch means tighter PCB routing and potentially higher crosstalk on adjacent signal pairs, particularly for analog or high-speed applications. Conversely, 0.100" pitch connectors are more prevalent in legacy VME, Multibus, and compact embedded systems, making the ESC19DREH-S13 a better choice for board-level compatibility. If your design space permits and signal integrity is critical, evaluate 0.156" alternatives; otherwise, the ESC19DREH-S13 provides adequate density for general-purpose I/O and control applications.
• Is the ESC19DREH-S13 suitable for use in applications requiring frequent hot-swap insertion and removal, or will contact wear degrade performance over time? The ESC19DREH-S13 is designed for board-edge mounting and straddle mounting, which means it is typically used in systems where card insertion/removal occurs intermittently rather than continuously. The full bellows contact design and gold finish are rated for typical industrial mating cycles (50–100 cycles), but the contact wear accelerates with increased mating events, especially if mating is performed without guides or alignment aids. In frequent hot-swap scenarios (>10 cycles per day over extended periods), contact resistance will increase, reducing signal margin. For critical applications, monitor contact resistance periodically and plan for connector replacement or card refurbishment after 5–10 years of regular use. If the application demands high-cycle hot-swap capability, consider connectors specifically rated for >500 mating cycles with reinforced contact springs.
• What surface preparation and cleaning procedures should be followed after soldering the ESC19DREH-S13 to prevent long-term reliability issues in humid or corrosive environments? The ESC19DREH-S13 features solder eyelets and a polybutylene terephthalate (PBT) insulation body. After soldering, residual flux (particularly no-clean or mild rosin flux) can trap moisture between the connector body and PCB, potentially leading to creeping corrosion or leakage current over months in high-humidity environments. Remove all flux residue using isopropyl alcohol or appropriate flux cleaner, then allow the board to dry completely. In applications operating in salt spray, industrial humidity, or marine environments, consider conformal coating (acrylic or urethane) around the connector's solder joint area, while avoiding the contact insertion area. The gold finish on the ESC19DREH-S13 contacts provides corrosion resistance for the mating surface, but the PBT body itself is hygroscopic; in long-term outdoor or high-humidity use (>85% RH), periodic cleaning and recoating will extend connector life.
• Can the ESC19DREH-S13 be used as a direct drop-in replacement for earlier Sullins edge connector models, such as the ESC18 or ESC20, and what compatibility issues should be anticipated? The ESC19DREH-S13 (base product ESC19) shares the same 0.100" pitch and solder eyelet termination family as related Sullins edge connectors, but direct replacement is not guaranteed without careful verification. The ESC18 is a 36-position (18 per row) connector, while the ESC20 is a 40-position (20 per row) connector, making them electrically and mechanically incompatible with the ESC19DREH-S13's 38-position (19 per row) configuration. The mounting hole pattern, flange dimensions, and solder eyelet spacing will differ, requiring PCB redesign. If migrating from ESC18 to ESC19DREH-S13, verify that your signal assignment allows for the additional two contacts (one per row), and confirm mechanical clearance around the connector body. For true backward compatibility, contact Sullins or consult the legacy connector datasheet to cross-reference dimension stacks. Using an incompatible part will result in misalignment, contact mismatches, and potential short circuits.
• What is the moisture sensitivity level (MSL) classification for the ESC19DREH-S13, and does it require special storage or handling in high-humidity manufacturing environments? The ESC19DREH-S13 is listed with Moisture Sensitivity Level (MSL) as "Not Applicable." This indicates that the connector does not require pre-bake conditioning or moisture-control storage as specified by IPC J-STD-020. The polybutylene terephthalate (PBT) body and phosphor bronze contacts are not susceptible to moisture-induced delamination or warping during standard PCB assembly processes. However, this does not mean the connector is impervious to moisture effects; the PBT material is mildly hygroscopic and can absorb 0.5–1% moisture by weight over extended periods in high-humidity storage. For long-term storage (>6 months) in environments exceeding 80% relative humidity, store the ESC19DREH-S13 in a dry bag with desiccant, or maintain storage in a controlled (typically <50% RH) component cabinet. Normal manufacturing floor conditions and standard component handling practices pose no risk.
• How does the dual-edge, 19-position-per-row configuration of the ESC19DREH-S13 affect signal integrity when routing high-speed or mixed-signal traces, and are there layout guidelines? The ESC19DREH-S13's dual-edge configuration places 38 contacts across two parallel rows separated by the connector body thickness (~0.2 inches). This creates asymmetric signal propagation paths: signals routed to the top row will have different trace lengths and parasitic capacitance compared to bottom-row signals. For mixed-signal designs (analog sensors, digital control, power distribution), group signal types by row if possible—place all power/ground on one row and signals on the other. For high-speed buses (if used), match trace lengths to within ±0.2 inches between corresponding top and bottom row signals. Use ground-plane continuity beneath the connector to minimize return-path inductance, and route sensitive analog signals away from digital switching noise sources. The 0.100" pitch limits routing density around the connector footprint; reserve at least two layers beneath the connector for through-hole vias and ground planes. Consider splitting the signal assignment between high-speed and low-speed domains to avoid crosstalk.
• What are the operating temperature extremes for the ESC19DREH-S13, and how does this affect the selection for aerospace, automotive, or industrial equipment applications? The ESC19DREH-S13 is rated for -65°C to 125°C operating temperature, which aligns with military and industrial-grade specifications (MIL-TEMP Grade). This range is suitable for harsh automotive under-hood applications, industrial control equipment, and aerospace avionics (non-flight-critical). At the cold extreme (-65°C), contact resistance increases due to material resistivity changes and reduced contact pressure (springs lose compliance); at 125°C, solder joint fatigue accelerates, and PBT material softens slightly, potentially allowing contact flutter. For automotive applications subject to thermal cycling (rapid transitions between -40°C and +85°C), factor in solder joint reliability by using appropriate PCB layout (avoid sharp corners in traces near solder joints) and potting or conformal coating if needed. For aerospace applications, verify that the ESC19DREH-S13's RoHS3 compliance does not conflict with your program's material approval list; some aerospace programs still require lead-containing solder due to whisker growth concerns with lead-free processes. The connector itself meets temperature requirements, but your solder alloy and assembly process must be validated for the full -65°C to 125°C range.
• The ESC19DREH-S13 is specified with 10.0µin (0.25µm) gold contact finish—is this thickness sufficient for long-term corrosion resistance, or should a thicker finish be specified for special applications? The 10.0µin (0.25µm) gold finish on the ESC19DREH-S13 is typical for standard industrial connectors and provides adequate corrosion resistance for normal office, factory, and mild outdoor environments. This thickness protects the underlying phosphor bronze from oxidation over 5–10 years in neutral to slightly humid conditions. However, in aggressive environments (salt spray, sulfur-bearing industrial atmospheres, or extreme humidity), 10µin gold is considered minimal; after 2–3 years, thinning and base-metal oxidation can occur, raising contact resistance. If the application demands extended service life in corrosive environments, request a connector with 50µin or thicker gold finish (special order from Sullins or alternate supplier). Alternative surface finishes, such as nickel underplate with thicker gold topplate or palladium-nickel, may also be specified. For the standard ESC19DREH-S13, periodical contact inspection (every 1–2 years) or protective conformal coating of the connector body can extend performance in marginal environments.
• Can the ESC19DREH-S13 be used interchangeably with DIN 41612 or other European edge connector standards, and what are the mechanical and electrical differences? The ESC19DREH-S13 is not directly compatible with DIN 41612 or IEC 60807 edge connector standards. DIN 41612 connectors typically feature 0.100" pitch but use a different flange geometry, mating force specification, and grounding scheme. The ESC19DREH-S13 is a Sullins proprietary design with specific mounting hole patterns and contact spring characteristics tuned for straddle mounting, whereas DIN 41612 connectors are designed for front-panel insertion with guide rails. Mechanically, DIN 41612 offers superior alignment and lower insertion force due to guided rails; the ESC19DREH-S13 requires careful hand alignment. Electrically, DIN 41612 Grade A and Grade B specify different row separations and contact arrangements; the ESC19DREH-S13's 19-position-per-row, 38-total configuration does not map to standard DIN pin counts. If your application calls for European standardization and interchangeable connectors across multiple vendors, specify DIN 41612 or IEC connectors from the outset. Using the ESC19DREH-S13 locks you into Sullins tooling and replacement parts.
• What is the expected insertion and extraction force for the ESC19DREH-S13, and does this create risk of damage to the PCB or mating edge card during manual insertion? The ESC19DREH-S13, with its full bellows contact design and 38-position configuration, requires moderate insertion force (typically 30–50 N total across all contacts for smooth manual insertion). This force is distributed across 38 contact points, resulting in ~1 N per contact, which is within safe limits for edge cards made of standard glass-reinforced epoxy (FR-4). However, if the edge card is thin, poorly supported, or made of brittle material (such as older phenolic or paper-based laminates), excessive bending stress during insertion can lead to lamination or cracking. Mitigation strategies include: (1) support the edge card with an alignment jig or guide block during insertion to prevent rocking, (2) use a card extractor tool to distribute load evenly, and (3) ensure the mating surfaces and contact tails are clean and free of oxidation (which increases friction). For systems requiring frequent card swaps, provide clear insertion/removal procedures and consider using low-insertion-force variants if available from the manufacturer. Monitor the PCB edge for stress cracks or lamination after repeated use.
• The ESC19DREH-S13 is RoHS3 compliant and REACH unaffected—what does this mean for supply chain continuity and long-term availability? RoHS3 (Restriction of Hazardous Substances Directive 3) compliance means the ESC19DREH-S13 is free from cadmium, mercury, lead, hexavalent chromium, and the newer restricted brominated flame retardants and phthalates as of the 2019 amendments. This classification ensures the connector can be legally sold and used in the European Union and regions adopting equivalent standards. "REACH Unaffected" indicates that the connector materials do not contain substances on the REACH Candidate List of Substances of Very High Concern (SVHC) at reportable concentrations, reducing regulatory documentation burden. From a supply chain perspective, RoHS3 compliance is now standard for most industrial connectors; however, if your application requires continued use of legacy lead-containing solder or requires exemption from RoHS restrictions (such as military or aerospace applications with specific approvals), this may conflict with your design. Verify with Sullins or your supplier that RoHS3 compliance will be maintained through production life and that long-term availability (typically 7–10 years post-RoHS transition) is guaranteed. Legacy compliance variants may become harder to source over time.
• If the ESC19DREH-S13 fails in field service, what are typical failure modes, and can the connector be repaired or must the entire PCB assembly be replaced? Common failure modes for the ESC19DREH-S13 include: (1) intermittent contact due to corrosion or mechanical wear after repeated insertion cycles, (2) bent or broken contact tails during insertion/extraction, (3) solder joint cracking due to thermal cycling or vibration, and (4) mating surface contamination (dirt, flux residue, oxidation). If a single contact fails, the fault is often localized to that position; if the issue is corrosion or bent contacts on the mating card edge (not the connector itself), cleaning or light mechanical restoration of the card may restore function without replacing the connector. However, if the solder eyelet joint has cracked or the connector body is physically damaged, the entire connector must be desoldered and replaced—a skilled technician can perform this repair, but it requires PCB rework equipment and risk of damaging adjacent traces. For mission-critical applications, implement redundancy by paralleling contacts or using hot-swap capabilities with fault detection. In production or high-volume field scenarios, stock spare connector-equipped daughter cards or main assemblies to minimize mean time to repair (MTTR).