- Can the ACC26DEYS 52-position edge connector accommodate both sides of a dual-edge PCB simultaneously, or does it require separate connectors for each edge?
- The ACC26DEYS is a dual-edge female connector with 26 positions per edge and 52 total positions, designed to mate with both edges of a dual-edge card in a single connector assembly. The dual read-out configuration allows simultaneous electrical contact on both card edges, eliminating the need for separate connectors. This reduces board space and simplifies the mating interface in backplane or slot-based designs.
- What are the design implications of the 0.062" card thickness specification for the ACC26DEYS when integrating with existing single-edge or non-standard thickness PCBs?
- The ACC26DEYS is engineered for 0.062" (1.57mm) thick cards. If your PCB is thicker or thinner, the cantilever contacts may not engage properly, resulting in intermittent connections or contact wear. Verify your card thickness matches this specification before design-in. Using oversized or undersized cards can compromise contact pressure and long-term reliability. Custom variants may be available for non-standard thicknesses, but component substitution is typically required.
- In high-vibration or transportation applications, how does the ACC26DEYS edge connector perform compared to alternatives with locking mechanisms?
- The ACC26DEYS features a side-mount opening with unthreaded 0.125" diameter holes but does not include integrated locking or retention mechanisms. In high-vibration or shock environments, the connector relies on the mating pressure of the cantilever contacts and mechanical fit. For applications requiring enhanced retention, consider adding external latching hardware, card guides, or edge card hardware. If vibration isolation is critical, evaluate connectors with keyed slots or integrated ejector mechanisms as alternatives.
- What is the minimum insertion force and contact life expectancy for the ACC26DEYS, and how do these factors affect design margins for applications with frequent card insertion and removal?
- The ACC26DEYS datasheet does not explicitly specify insertion force or contact life cycles in standard documentation. For applications involving repeated mating cycles, contact Sullins Connector Solutions directly for mechanical and electrical life test data. Beryllium copper contacts with gold plating typically support thousands of cycles, but actual performance depends on contact pressure, cleanliness, and operating temperature. Design for minimal manual insertion cycles where possible, and implement protective measures such as contact shields to reduce contamination.
- How does the 30.0µin (0.76µm) gold plating thickness on the ACC26DEYS compare to industry standards, and what corrosion or wear concerns should be considered for long-term outdoor or corrosive environments?
- The ACC26DEYS provides 30.0µin of gold plating over beryllium copper contacts. This thickness is within typical commercial connector specifications but at the lower end for harsh environments. In corrosive, high-humidity, or salt-spray applications, thinner gold plating may allow underlying base metal corrosion after extended exposure. For outdoor or marine use, consider connectors with thicker gold (50–100µin) or evaluate alternative contact materials. RoHS3 compliance ensures lead-free solder joints, but the connector itself requires verification against specific environmental standards such as IEC 61076-2-109 if operating in harsh conditions.
- Can the ACC26DEYS be reliably substituted for older Sullins ACC26 series variants, and what differences in contact geometry or electrical performance should be evaluated?
- The ACC26DEYS is part of the ACC26 base product family. However, not all ACC26 variants are electrically or mechanically identical. Differences may exist in contact finish thickness, plating material, cantilever stiffness, or mating orientation. Before substituting the ACC26DEYS for a legacy part number, verify contact compatibility, pitch, position count, and card thickness specifications. Electrical performance, including resistance and impedance characteristics, may differ. Request mechanical drawings and contact resistance test data from your supplier to confirm drop-in equivalence in your specific application.
- What are the electrical performance characteristics of the ACC26DEYS in high-speed digital or RF applications, and are impedance or crosstalk considerations documented?
- The ACC26DEYS is specified as a general-purpose 0.100" pitch edge connector with dual-edge readout. Impedance matching, propagation delay, and crosstalk specifications are not typically provided for this connector class. If your application requires controlled impedance or high-speed signal integrity (above 100 MHz), the ACC26DEYS may introduce reflections or signal distortion. For high-speed designs, consult the detailed electrical specifications or request test data. Consider alternatives such as high-speed edge connectors with impedance control if signal integrity is critical.
- In the ACC26DEYS, how should the side-mount opening with 0.125" unthreaded holes be utilized for mechanical mounting, and what fastener specifications are recommended?
- The side-mount opening and 0.125" diameter unthreaded holes are designed for mechanical retention and alignment during assembly. These holes accommodate standard fasteners (such as 0-80 or M2 screws) to secure the connector to a backplane or housing. Use #4-40 or 0-80 fasteners with appropriate washers to distribute load and prevent cracking of the insulation material (polyphenylene sulfide). Torque fasteners conservatively; PPS is rigid but brittle. Verify hole placement and fastener thread compatibility with your mechanical design before manufacturing.
- How does the polyphenylene sulfide (PPS) insulation material of the ACC26DEYS affect its performance under elevated temperatures near the 150°C maximum operating specification?
- Polyphenylene sulfide (PPS) is a high-performance thermoplastic with excellent thermal stability and is suitable for continuous operation at 150°C. However, PPS creep and dimensional change increase at elevated temperatures. The ACC26DEYS maintains structural integrity across the -65°C to 150°C range, but contact pressure and mechanical fit may be affected by thermal expansion of the insulation material, particularly in dual-edge configurations where tolerance stack-up is critical. Over extended periods at 150°C, verify that contact retention and mechanical alignment remain within specification. Thermal cycling can exacerbate dimensional drift.
- What compatibility issues should be considered when using the ACC26DEYS with lead-free (RoHS3-compliant) solder processes, and are there any specific reflow or thermal profile recommendations?
- The ACC26DEYS is RoHS3 compliant and designed for lead-free solder compatibility. Lead-free solder (typically SAC305) has a higher melting point (~217°C) than lead-bearing solder (~183°C). Ensure your reflow profile does not exceed the thermal limits of the PPS insulation material or damage the gold plating. The beryllium copper contacts with gold finish are compatible with standard lead-free processes. Verify thermal cycling capability with your assembly partner. No special surface treatments or finishes are required; however, confirm that existing solder paste and flux formulations are qualified for this connector's material composition.
- Is the ACC26DEYS suitable for applications requiring high current per contact, and what contact resistance or thermal considerations apply?
- The ACC26DEYS is a general-purpose connector with cantilever contacts designed for moderate signal and low-to-moderate current applications. Specific maximum current ratings per contact are not provided in standard product documentation. For high-current applications (above 1–2 amperes per contact), contact resistance and self-heating become significant concerns. Beryllium copper contacts with gold plating typically exhibit contact resistance in the range of 10–50 milliohms, depending on contact pressure and mating cycles. For high-current designs, request current ratings and thermal test data, or consider connectors specifically rated for power distribution.
- How does the ACC26DEYS handle mechanical stress or repeated mating in applications with loose mechanical tolerance stack-ups, and what preventive measures ensure consistent contact engagement?
- The ACC26DEYS relies on consistent 0.062" card thickness and accurate connector positioning to maintain contact pressure across all 52 positions. Loose mechanical tolerances in the backplane or card edge can result in uneven contact engagement, intermittent connections, or accelerated wear on cantilever contacts. Design card guides, registration features, or alignment pins into your backplane to minimize lateral movement during insertion. Verify that the connector is rigidly mounted and aligned perpendicular to the card edge. Over time, repetitive mating with poor alignment accelerates contact wear and increases contact resistance.
