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Card Edge Connector
Industrial, IT Datacom
the module seats from the other end of the slot. This is not a cosmetic difference — it determines which direction a service technician can remove and replace a memory module without pulling the board out of the chassis.
You specify RVS when:
The thermal assembly (vapor chamber, heat spreader, fan shroud) covers the memory zone from above, and module insertion must happen from the board edge
Your PCB mounts component-side-down inside a sealed or semi-sealed enclosure, and memory maintenance happens through a base-plate access panel
You are building a dual-board assembly where one socket faces up and one faces down — mirrored orientations give you symmetric signal paths and balanced mechanical loading
The 9.2mm height places this socket in the standard-profile category. It is not the ultra-low-profile 3.0mm or 5.2mm variant designed for tablets and convertible laptops — those trade contact beam length and insertion feel for z-height savings. At 9.2mm, the contact beam has room for proper dual-wipe geometry, which provides more consistent normal force across all 262 positions and a more reliable mating interface throughout the module's service life.
Profile Height | Typical Application | Durability (JEDEC min.) | Z-Clearance Needed |
|---|---|---|---|
3.0mm | Tablet, ultra-thin convertible | 25 cycles | Minimal |
5.2mm | Thin laptop, mini PC | 25 cycles | Low |
9.2mm (this part) | Laptop, SFF desktop, industrial | 25 cycles | Standard |
Tall stack | Server blade, industrial rack | 25+ cycles | High |
DDR5 SO-DIMM adds two positions compared to DDR4's 260-pin interface, but the module length and contact pitch (0.5mm) remain the same. The additional pins accommodate DDR5's reworked command/address bus and the modified power delivery structure. DDR5 also relocates the PMIC (power management IC) onto the module itself — the socket now delivers 12V to the module edge, and the module handles all down-conversion internally.
This changes the electrical environment the socket must handle. The CA bus in DDR5 follows a different fly-by topology than DDR4, and the DQS differential pairs are re-routed. The contact plating and insulator dielectric on the CUR008S5401XX are specified for the DDR5 signal environment across the full speed range — 4800 through 6400+ MT/s on current JEDEC modules, with headroom for the 8800 MT/s endpoint on the DDR5 roadmap.
The contact system uses a high-temperature copper alloy base metal with selective gold flash on the mating area and tin plating on the solder tail. This is the standard DDR5 SO-DIMM plating specification, but the execution is what matters: contact normal force, beam deflection curve, and wipe distance determine whether you get clean signal transitions or intermittent high-frequency failures after thermal cycling. CONSHARE controls these parameters through lot-level insertion force testing and contact resistance sampling.
Laptops, 2-in-1s, and portable workstations running DDR5 SO-DIMM at 4800–6400 MT/s gain real bandwidth over DDR4-3200 — roughly 50% higher throughput at the entry-level speed. Integrated graphics benefit directly; a platform using shared memory for GPU workloads sees the performance uplift in real applications, not just benchmarks. The RVS orientation suits designs where the palm rest assembly sits directly above the memory bay, blocking standard top-down insertion.
Compact edge computers — the kind running vision processing on a factory floor or inference at a network node — use SO-DIMM for the same density reasons as laptops. These platforms often mount boards component-side-down inside DIN-rail or wall-mount enclosures. RVS allows memory servicing through the enclosure's bottom access panel without removing the entire board stack.
Small-form-factor desktops, NUC-class platforms, and digital signage players pack SO-DIMM sockets into sub-liter chassis volumes. The RVS variant works in designs where the motherboard sits sandwiched between a thermal base plate and a top I/O board — the module slides in from the open edge of the PCB rather than from the component side.
Before ordering, verify your mechanical layout. The single most common procurement error is ordering RVS when the design calls for standard orientation, or vice versa. Here is how to verify: review your PCB mechanical drawing. If the memory module's keying notch faces away from the standard loading edge — or if your assembly drawing specifies bottom-edge or reverse-direction insertion — you need RVS. If you are unsure, send the mechanical drawing to CONSHARE engineering for a fit check.
DDR5 SO-DIMM and DDR4 SO-DIMM use different keying notch positions and different pin counts (262 vs. 260). A DDR5 module will not seat in a DDR4 socket. If your platform was designed for DDR4 and you are evaluating a DDR5 upgrade, the socket is one of the components that must change — along with the memory controller, the board routing, and the power delivery architecture.
Quantity | Lead Time | Packaging | Notes |
|---|---|---|---|
Samples (≤10) | 3–5 days | Tray | Design validation |
Pilot (100–500) | 2–3 weeks | Tray | NPI builds |
Production (1K+) | 3–4 weeks | Tray or tape & reel | Volume pricing |
Scheduled | Per agreement | Per agreement | Kanban / blanket PO |
The CUR008S5401XX is produced under IPC-A-610 Class 3 acceptance criteria — the inspection standard for high-reliability electronics. Every production lot undergoes:
100% contact continuity verification
Insertion cycle validation exceeding the JEDEC minimum (25 cycles) on sample units
Solder tail coplanarity held to 0.10mm maximum — critical for reflow yield at 262-pin density
LCP (liquid crystal polymer) insulator rated for 260°C lead-free reflow peak
Custom options for volume accounts include modified solder tail lengths for thick or multi-layer PCBs, tape-and-reel packaging for automated pick-and-place, full lot traceability documentation, and date-code-controlled shipments for automotive and medical supply chains. Minimum order for custom configurations is typically 3,000 pieces; standard configurations ship with no MOQ for samples.
RVS stands for reverse. The module seats from the opposite edge compared to a standard socket — the keying notch is mirrored. You need RVS when your mechanical design blocks standard top-down module insertion, typically due to thermal solution coverage or board mounting orientation inside an enclosure.
No. DDR5 SO-DIMM uses 262 pins with a different keying position than DDR4's 260-pin interface. The two module generations are physically incompatible by design — the keying prevents cross-generation insertion.
The contact system and insulator are specified for the full DDR5 SO-DIMM speed range — 4800 MT/s through 8800 MT/s per the JEDEC roadmap. The socket itself is not the speed bottleneck; signal integrity at higher data rates depends on PCB routing, module design, and the platform's memory controller.
Reflow soldering is strongly recommended for 262-pin density. The insulator is rated for 260°C peak per JEDEC J-STD-020, compatible with standard lead-free reflow profiles. Wave soldering is possible but not recommended at this pin count due to solder bridging risk.
Yes. Custom solder tail lengths, specialized packaging (tape & reel), traceability documentation, and date-code-controlled shipments are available for volume orders. Contact CONSHARE with your specific requirements.
