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Card Edge Connector
Industrial, IT Datacom
Every motherboard or memory-module assembly line has one thing in common: a failed DIMM slot doesn't show up until final test. By then, the board has already absorbed solder, labor, and testing time — and replacing a through-hole connector after wave soldering is rarely economical. That's why CONSHARE built the DDR4 288-pin gold-finger DIP slot around the failure points we see most often in the field: contact oxidation, latch fatigue, and solder-joint inconsistency.
This slot accepts standard DDR4 modules per the JEDEC MD-XXX module outline, with a 2.50 mm through-hole tail pitch and a PCB footprint matched to the recommended layout. It ships with no embossed logo, keeping the top surface clean where enclosure clearance or visual requirements matter. Two stocked latch configurations cover the most common assembly needs:
Order Code | Body Color | Latch Color | Housing Material |
|---|---|---|---|
BR28801A2K1CR | Black | Black | PA66, 30% glass-filled |
BR28802A1K1CR | Black | White | PA46, glass-filled |
Both configurations share the same contact system, plating stack, and mechanical geometry — the latch color is a functional choice, not a performance trade-off.
BR28801A2K1CR pairs a black housing with black latches. Board builders choose this combination for a uniform appearance across the board surface, and for production environments where module identification happens through silkscreen or testing rather than visual differentiation at the slot. If your line runs a single module type per board position, or your design documentation handles channel identification internally, the all-black configuration keeps the assembly looking deliberate and finished.
BR28802A1K1CR uses a white latch against the black body — the highest-contrast option available. Service technicians who swap modules in the field benefit from the visual anchor when guiding a module into the slot under low light or in dense board layouts. In mixed-density configurations, many integrators also use latch color as a quick channel marker during board bring-up. The latch itself carries the same PA66 glass-filled construction and the same open/close force profile as the black version, so durability is not a factor in this choice.
The ejector isn't decorative. DDR4 modules seat with a combined insertion force of up to 106.8 N — firm enough that a module won't drift loose under vibration, but manageable for one-handed installation when both latches are open. The latch mechanism locks on insertion and provides the mechanical leverage to break the contact friction on removal. CONSHARE rates the slot for 25 insertion/removal cycles, which covers module swaps, board diagnostics, and firmware-debug sessions without approaching the wear limit.
The contact area and the solder tail do different jobs, so they get different finishes. The contact zone — where the module's gold fingers slide in — carries a nickel underplate with gold-flash plating over copper alloy. Gold at the mating interface resists oxidation for the life of the product, which matters because even thin oxide layers raise contact resistance in a signal path this dense.
The solder tails see a different environment: molten solder. There, matte tin at a minimum 80 µ" thickness provides the wetting behavior wave-soldering lines depend on. The matte formulation (rather than bright tin) reduces tin-whisker growth risk — a documented failure mode in fine-pitch through-hole assemblies.
DDR4 runs at 1.2 V with tight noise budgets. The slot's per-pin current rating of 0.75 A leaves headroom above the actual per-pin load of a populated DDR4 module, and initial contact resistance stays at or below 30 mΩ — low enough that the connector doesn't become the dominant impedance discontinuity in the channel. Insulation resistance holds at a 1 MΩ minimum under 500 V DC test conditions, and the dielectric withstand passes 500 V AC without breakdown.
For layout engineers, the practical takeaway: this slot won't be the weak link in your signal-integrity simulation.
The connector is qualified for wave soldering at 260 ±5 °C with a 10-second immersion. That's a standard profile for through-hole memory connectors, and it means the PA66/PA46 housings won't warp or outgas at normal line temperatures. If your line runs a more aggressive profile for other components, keep the slot's tails out of the hottest zone or shield the body during preheat.
The recommended PCB layout uses Ø2.45 ±0.05 mm plated through-holes at the 2.50 mm tail pitch. Dimensionally, the connector's critical feature sits at 133.35 ±0.15 mm, with the datum structure referenced to the PCB edge for consistent placement. CONSHARE supplies the full recommended footprint and keep-out drawings — including the tie-bar keep-out zone at the PCB bottom edge — with every order confirmation, so your CAD team isn't reverse-engineering land patterns from a sales sheet.
The connector platform supports configuration changes beyond the two stocked versions, with reasonable minimum-order quantities:
Latch colors: Black, white, gray (431C), blue (293C), blue (297C), green (376C)
Body colors: Eight standard options including black, white, and six functional colors for channel coding
Housing materials: PA66, PA46, or PA9T — the higher-temperature PA9T targets lead-free reflow profiles that run closer to the housing's thermal limit
Gold thickness: Flash gold (stocked) up to 30 µ" for high-insertion-count or harsh-environment applications
If your application pushes a spec — more durability cycles, elevated operating temperature, a specific pantone for brand consistency — send the requirement with your RFQ and CONSHARE's engineering team will confirm feasibility and any tooling impact before quoting.
Memory-slot quality is a molding-and-plating problem more than an assembly problem. CONSHARE runs in-house molding with tooling maintenance schedules tied to shot counts, so the glass-filled housings stay dimensionally stable across production lots. Contact stamping and plating thickness are verified on a sampling basis per lot, with plating cross-sections checked against the 80 µ" tin minimum and the nickel underplate spec.
Slots ship in trays of 60 pieces, with 10 trays per carton — 600 pieces per carton at standard carton dimensions of 355 × 280 × 300 mm. The tray format protects latches from crush damage in transit and lets SMT/through-hole lines load directly from line-side racks without additional handling. For high-volume builds, full-carton ordering simplifies incoming inspection and inventory counts.
Stocked configurations (the two part numbers above) move fastest. Custom latch, body-color, or plating variants typically add tooling-confirmation time but no unusual production delay once the configuration is locked. RoHS compliance applies across the platform, so documentation for EU-bound shipments is available with the shipment paperwork.
No — DDR5 uses a different keying geometry and pin count. For DDR5 platforms, look at CONSHARE's DDR5 slot family.
Both are glass-filled engineering polymers suited to wave-soldering temperatures. PA46 offers slightly better high-temperature rigidity; PA66 is the industry-standard workhorse. Both are UL94 V-2 rated. In practice, either housing meets standard DDR4 platform requirements.
25 cycles minimum per the mechanical specification. This covers production test, field service, and module upgrades. If your application requires frequent re-seating — test fixtures, for example — ask about the thicker gold plating options, which extend contact life.
Yes. The gold-flash contact finish pairs with standard gold-finger module edge connectors, matching the material system DDR4 module manufacturers use.
