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Card Edge Connector
Industrial, IT Datacom
BR164251K1CX is a 164-position, 1.00 mm pitch card-edge connector built for PCIe Gen4 add-in cards running at 16 GT/s. The pin count is standard; the thinking around it is not. Rotatable guide posts, a large latch, an eave-style DIP body, and a card slot dimensioned for a 1.57 mm board — every one of these exists because of a field failure that someone has already paid for. This page explains what those details actually do, and how to pick the right version for your build instead of just the cheapest one.
PCIe 4.0 add-in cards are heavier than their predecessors. A modern GPU or accelerator carries a full-size heatsink and sometimes a backplate, and in a server chassis it sits in a slot that sees continuous vibration from fans and drives. Weight plus vibration is exactly where card-edge connectors fail, and it is why this part is built the way it is.
Before the card edge reaches the contacts, the guide posts meet the alignment holes first and self-center the card. Because the posts rotate, the card settles into its true position instead of forcing the pins sideways. Bent pins from blind mating are the most common field failure on card-edge connectors; guided insertion is the direct answer to it.
With 82 contact pairs, worst-case insertion force runs to about 94 N and minimum extraction force to roughly 12 N (1.15 N max and 0.15 N min per pair). Without a positive lock, that force plus the weight of the card works against the solder joints every time the system is moved or shaken. The large latch carries that load so the joints do not have to.
The housing extends over the solder tails, stiffening the tail region and shielding the tails from handling damage before assembly. The tails are still a 1.00 mm pitch through-hole layout, so no changes to an existing wave-soldering process are needed.
Tuned to the standard thickness of a PCIe add-in card, the slot grips the board along the full mating length — not just at the contact points — which spreads mechanical stress evenly during insertion and extraction.
At 16 GT/s per lane, the contact interface stops being a purely mechanical concern. The 1.00 mm pitch, dual-row (82 × 2) contact layout keeps the mating interface tight and consistent, and the gold-plated contact area gives the signal a stable, repeatable transition from card to board.
These ratings are worth reading in context:
Contact resistance ≤ 30 mΩ — a tight, stable interface is the difference between a clean eye diagram and intermittent bit errors. This limit is measured at the contact pair, so it covers the worst point in the link, not an average.
1.1 A per pin minimum — for power-hungry accelerators that draw current across many pins, this rating means current can be distributed evenly across the interface without localized hot spots.
500 V DC / 1 min dielectric strength and ≥ 1000 MΩ insulation resistance — relevant when the same connector carries high-speed differential pairs alongside lower-speed control or power lines.
All versions plate the solder tails with 80 µ" tin minimum over a full nickel underplating, which blocks copper migration and keeps the tails solderable after long storage. The real difference is the gold thickness in the contact area — a straightforward cost-versus-lifetime trade:
Plating code | Gold in contact area | Best fit |
|---|---|---|
A | Flash gold | High-volume consumer and entry-level systems; low insertion cycles |
B | 3 µ" min | General commercial equipment |
C | 5 µ" min | Frequent card swaps in lab and test environments |
D | 10 µ" min | Industrial systems with periodic maintenance cycles |
E | 15 µ" min | Harsh environments, high-reliability targets |
G | 30 µ" min | Maximum durability; continuous-duty or high-vibration installations |
If the card is mated once at manufacturing and rarely touched, flash or 3 µ" gold is honest engineering. If the slot sees monthly re-seating or lives next to a vibration source, move up to 10 µ" or beyond. Paying for 30 µ" where 3 µ" would do is wasted cost; paying for 3 µ" where the slot gets re-seated weekly is a future warranty claim.
DIM A sets the distance from the board surface to the mating plane of the card — in practice, how high your card sits above the PCB. The connector is available in three values on the same footprint:
DIM A | Typical use |
|---|---|
2.50 mm | Low-profile builds; cards with onboard heatsinks, tight chassis clearance |
3.10 mm | Mid-height stacks; room for taller components under the card |
3.50 mm | Taller stacks; more airflow under the card, easier thermal management |
The choice is driven by what sits underneath the card: passive components, a VRM, a mezzanine. Pick the height that clears the tallest component with margin — and remember that more clearance under the card also means better airflow for the components there.
Parameter | Value |
|---|---|
Contact resistance | 30 mΩ max |
Insulation resistance | 1000 MΩ min |
Dielectric strength | 500 V DC, 1 min |
Current rating | 1.1 A per pin min |
Insertion force | 1.15 N per contact pair max |
Extraction force | 0.15 N per contact pair min |
Durability | 50 mating cycles |
Operating temperature | −25 °C to +85 °C |
Housing | LCP, 30% glass-filled, UL94V-0, black |
Terminal | Phosphor bronze, 0.25 mm thick |
GPU and AI accelerators — heavy cards, high power draw, server vibration. The latch and guided mating are not optional here.
Storage controllers (HBA / RAID) — slots that see periodic card swaps during upgrades.
Network adapters (NIC / OCP form factors) — a loose card means a dropped link, and a dropped link means a paged network engineer.
Industrial and edge computing — the −25 to +85 °C range and the vibration resistance of the latch matter more than raw bandwidth on a factory floor.
CONSHARE builds this connector under the same discipline applied to every card-edge product:
Dimensional inspection against drawing tolerances, contact-force sampling, and visual checks on plating and housing defects before packaging.
RoHS-compliant as standard, with halogen-free and general-purpose (GP) variants available for programs that require them.
Plating combinations are selectable from the codes above, housing color can be specified, and packaging can be adjusted to your line's feeding method. Tray packaging is standard, protecting the guide posts and latch during transit and handling.
As a manufacturer rather than a trading house, we quote from production schedules instead of shelf stock, which means stable lead times for volume programs and controlled date codes for traceability.
Samples and PCB-layout review are handled directly by application engineers — send the part number with your board stack-up, and you will get a fit-and-clearance answer, not a form letter.
Physically, yes — the mechanical interface of PCIe add-in cards has not changed. Electrically, the connector's ratings are specified for Gen4 operation at 16 GT/s; validate your link margins if you intend to run it at higher data rates.
The slot is tuned to the standard PCIe card thickness. Thicker boards insert with higher force and stress the contacts; for non-standard card thicknesses, discuss your board spec with our engineers rather than forcing it.
They are the first point of contact during mating. Because they rotate, they correct card misalignment before the pins reach the card edge, preventing the bent pins that cause intermittent failures.
Count your mating cycles. Rarely re-seated slots → flash or 3 µ". Regular swaps → 5–10 µ". Harsh environments or high-reliability programs → 15–30 µ". The solder tails are identical across all options.
The overhanging housing stiffens the tail area and protects the tails from handling damage before soldering. It adds mechanical robustness without changing your through-hole process.
