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Card Edge Connector
Industrial, IT Datacom
A memory socket only gets attention when it fails. The module clicks in, the board passes test, the system ships — and the connector stays anonymous until a DIMM loses contact in the field or a batch of boards shows up with suspect solder joints. This DDR4 288-pin socket is built to stay that anonymous: glass-filled housing, gold-flashed contacts, matte-tin 3.00 mm DIP tails, and the kind of dimensional discipline that keeps wave-soldering yield predictable.
For your assemblers, the 3.00 mm DIP tail is the whole story. On a typical multilayer board — 1.6 to 2.4 mm finished thickness — that length lets each pin pass through the plated hole and form a visible fillet on the far side. Visible fillets are the cheapest inspection tool on the line: an operator or an AOI can verify the joint at a glance, and marginal connections get caught before the board moves on. That quietly improves first-pass yield on boards that mix SMT components with through-hole power and I/O parts.
The tail is matte-tin plated, 80µ" minimum. Matte tin wets faster and more predictably than bright tin in a wave bath, which helps yield, and it is far less prone to whisker growth over years of service. For a board that may sit in a rack for five years or more, that second point isn't a theoretical concern; it's a field-failure risk you can design out.
The socket is qualified for 260 ±5 °C wave soldering with a 10-second immersion, which matches standard lead-free profiles — no process concessions needed. And since the solder tail is identical across the plating options, you can change contact finish without re-qualifying the wave process.
If your line already runs a wave step for other through-hole parts, a DIP socket costs you nothing extra in process — and gives you a solder joint you can visually verify. If the board is pure SMT, a surface-mount version of this connector is worth discussing with our engineers instead. The 3.00 mm tail is the right length for conventional multilayer boards; unusual board stacks are worth a quick call to engineering.
Every DDR4 socket buyer eventually asks the same thing: how much gold do I actually need? The honest answer is less than the marketing sheet suggests, and more than zero.
Gold flash (G/F) over a 30µ" nickel underplate is the sensible default for most volume boards. The nickel does the heavy lifting — it blocks copper migration and keeps the contact interface stable — while the gold flash protects the nickel from oxidation before first insertion. For a socket whose DIMMs are inserted once and left alone for years, that combination is hard to beat on cost.
Thicker gold earns its price when DIMMs come out and go back in repeatedly: test stations, RMA benches, high-turnover lab machines. That's where the 15µ" and 30µ" options pay for themselves.
Contact finish | Nickel underplate | What it's for |
|---|---|---|
Gold flash (G/F) | 30µ" min | Volume server/embedded boards, single install, cost-sensitive |
Gold 3µ" | 30µ" min | Light service, occasional DIMM swap |
Gold 15µ" | 30µ" min | Frequent field upgrades, test and lab use |
Gold 30µ" | 30µ" min | Maximum cycle life, harsh or corrosive environments |
On the electrical side, the details are equally deliberate. Contact resistance is held to 30 mΩ initial with a 15 mΩ maximum drift over life — the kind of margin that keeps a marginal contact from becoming an intermittent fault that takes weeks to isolate. Impedance is controlled to 50 Ω for the DDR4 1.2 V signaling environment, with current capacity to 0.75 A per pin. None of this shows up in a product photo; all of it shows up in memory that runs stable for years.
The housing and ejector clips are molded in PA66 with 30% glass fiber, rated UL-HB. The glass does two jobs: it keeps the long, thin walls of the housing straight under molding stress, and it gives the latch clips the stiffness they need without turning brittle. That matters because the clips are the part a technician actually touches — they take the abuse of every DIMM change, and a clip that cracks on the third cycle is a clip that should never have shipped.
The white clips aren't a styling choice. Against a black housing and a dark chassis, they give line workers and field techs a visual latch check from across the bench — if you can see white, the module is locked. It's a small thing that prevents a whole class of "was it seated?" failures.
Retention is layered. Each contact pair delivers a minimum 14 gf of unmating resistance, and with 144 pairs under a module, that compounds into enough holding force to shrug off shock and vibration. The socket is rated for 25 insertion/extraction cycles, consistent with standard DIMM socket expectations — plenty for the install-once life of most systems, and honest about it.
Molded lead-in ramps guide the module into alignment during insertion, so edge connectors don't get damaged by slightly-off approach angles — useful both on the line and in the field.
Server and workstation motherboards, where 1.2 V DDR4 runs hot and stays untouched for years.
Network switches and routers, typically built on mixed-technology lines where the DIP tail fits the existing process.
Industrial PCs and edge gateways, where shock and vibration are real and the visual latch check pays off in the field.
Storage systems and NAS appliances, where memory is rarely touched and gold flash keeps the BOM cost where it should be.
Quality control. Every lot is verified against the critical dimensions that decide seating and solderability — housing straightness, tail length and coplanarity, contact finish thickness. Shipments carry lot traceability, so if anything ever comes up, the answer to "which parts are affected?" takes minutes, not days.
Lead time and samples. Common configurations — black housing with white clips, gold flash — are kept in a fast-turn pipeline, and samples for design validation are available before you commit to volume.
Customization that doesn't complicate your life. Contact plating can be specified from gold flash up to 30µ" gold; housing color, clip color, packaging (tray), and environmental grade (RoHS, GP, or halogen-free) are all configurable. The solder tail and its qualified wave window don't change when you switch finishes, so your process qualification stays valid.
Engineering support. CONSHARE provides the recommended PCB footprint up front, so mounting holes, keep-outs, and routing clearance are right on the first board revision — not discovered on the third.
Not for install-once boards. If DIMMs will be swapped regularly or the environment is harsh, step up to 15µ" or 30µ". Decide based on how many insertion cycles the socket will actually see, not on marketing.
DIP if your line already runs wave soldering; it adds no process step and gives you inspectable joints. SMT if the board is all-SMT — ask us for the SMT variant.
Yes — 260 ±5 °C, 10-second immersion, which sits inside standard lead-free profiles.
Yes, samples for design validation are available; lead times and MOQ depend on the configuration, so ask for a quote on your exact spec.
Black and blue housings, black or white clips — pick what fits your board's service and inspection needs.
