What This 98-Pin PCIe Slot Delivers on the Board

This standard-footprint PCIe x16 slot connector measures 56.00 ± 0.35 mm overall, with a 1.00 mm card-edge contact pitch and 2.50 mm DIP solder tail pitch. The housing is LCP with 30% glass-fiber fill, UL94V-0, in black. Terminals are brass, 0.25 mm thick, with gold on the contact area, 80 μ" minimum tin on the solder tail area, and 30 μ" minimum nickel underplate overall.

CONSHARE offers two contact finishes: flash gold and 30 micro-inch gold, mapped to part numbers BR09801A5K1ER and BR09801G5K1ER. Everything else — housing, terminal material, footprint, and guide post geometry — stays identical.

Material Choices That Survive Reflow and Field Use

Housing — Why LCP+30% G/F Matters

LCP with 30% glass-fiber reinforcement holds its geometry through lead-free reflow and wave soldering without softening or warping. A warped slot is a latent defect — it can pass factory continuity testing and still fail months later when thermal cycling loosens the misaligned contact beams. The UL94V-0 rating means the material self-extinguishes on ignition, which is mandatory for products shipping into regulated markets.

Terminals — Brass at 0.25 mm

Brass balances spring force and fatigue life at this thickness. Maximum insertion force stays under 1.15 N per contact pair while the 0.15 N minimum extraction force keeps the contact beams tight enough to resist fretting — the micro-motion that generates oxide debris and drives contact resistance upward over time. The 80 μ" minimum tin on solder tails ensures clean SAC305 wetting into the plated through-hole, avoiding voids and cold joints that can escape visual inspection.

Two Plating Grades, Two Production Profiles

When Flash Gold Is the Right Call — BR09801A5K1ER

Flash gold is just thick enough to protect the nickel underplate from oxidation and provide low contact resistance at initial mating. For a desktop board where the GPU seats once at the factory and never moves, 50 cycles is generous headroom. The BOM stays lean and the 30 mΩ contact resistance spec holds comfortably within this service profile.

When 30μ" Gold Justifies Its Premium — BR09801G5K1ER

Each insertion scrapes a microscopic amount of gold from the contact surface. A flash layer wears through to nickel faster; 30 μ" simply lasts longer. Once nickel is exposed, contact resistance climbs and fretting corrosion accelerates. In a test fixture that cycles cards daily, or an industrial PC where field technicians swap I/O cards during maintenance, the incremental cost of Au30u'' is cheaper than chasing intermittent PCIe link-training failures.

Both variants share the same PCB footprint and pick-and-place setup. You can run G/F on one slot position and Au30u'' on another without touching the layout.

Electrical and Mechanical Margins Worth Checking

Contact Resistance — 30 mΩ Max

Low enough that PCIe link training and eye diagrams at Gen 3 (8 GT/s) or Gen 4 (16 GT/s) are not degraded by the connector interface. Every milliohm in the differential signal path counts toward the total channel loss budget.

Insulation Resistance — 1000 MΩ Min

With 16 parallel differential lanes running the length of the connector body, 1000 MΩ between adjacent contacts keeps crosstalk through the insulator below any practical concern at PCIe signaling rates.

Dielectric Strength and Current Rating

500 V DC for one minute provides headroom for ESD events, hot-plug transients, and power-supply fault conditions. The 1.1 A per-pin minimum current rating covers the +12 V, +3.3 V, and +3.3 V auxiliary rails — aggregate capacity scales with the number of parallel power pins allocated to each rail.

Durability and Temperature

The 50-cycle durability rating is the family baseline; Au30u'' exceeds it. The -25 °C to +85 °C operating range covers commercial and light-industrial environments. For sustained ambient above 70 °C, plan derating or airflow — the LCP housing and brass terminals have thermal limits like any polymer-and-metal assembly.

Why Guide Post Alignment Still Beats a Latch-Only Design

Molded guide posts engage the add-in card bracket alignment holes before edge fingers reach the contact beams — mechanical registration first, then electrical mating along a controlled straight path. This matters in any orientation where the installer cannot see the slot: a 2U rackmount chassis, a wall-mounted industrial controller, or any vertical-mount motherboard.

Latch-only designs rely on the card-edge chamfer and plastic latch to guide insertion. On a bench that works. In a cramped enclosure at an awkward angle, partial insertion and bent contacts become real failure modes. Guide posts remove the variable — the card either aligns or it will not engage.

The posts are molded into the same LCP shot as the housing body. No additional part, no additional assembly step, no extra BOM line.

Layout and Soldering Considerations

PCB Footprint Compatibility

The 2.50 mm DIP tail pitch leaves enough room to fan out differential pairs from the 1.00 mm card-edge contact pitch without minimum-width traces in the breakout region. CONSHARE provides recommended edge-card patterns for both primary and secondary add-in card sides.

Assembly Process Fit

Wave soldering handles the connector straightforwardly — top-side placement, bottom-side solder wave. If your line runs selective soldering for double-sided SMT, the 2.50 mm pitch clears solder nozzles without bridging. The LCP body tolerates both thermal profiles.

The black housing color also improves AOI contrast against shiny SAC305 joints compared to white or natural insulators, reducing false rejects on high-speed inspection lines.

Where This Connector Fits in Real Designs

Desktop and Workstation Motherboards

Typically BR09801A5K1ER. The card seats once at the factory, per-board cost drives the BOM, and 50 insertion cycles provide margin for the rare field upgrade.

Industrial PCs and Embedded Controllers

Often BR09801G5K1ER. Enclosures are cramped, cards get pulled for maintenance, and guide posts earn their value when a technician swaps an I/O card with limited visibility.

Test and Validation Fixtures

Almost always Au30u''. Burn-in racks and QA stations may cycle cards dozens of times per shift. Contact degradation on a test fixture shows up as flaky signal-integrity readings — the engineering time wasted chasing phantom failures dwarfs the plating premium.

One footprint, one layout approval cycle, two plating choices covering all three use cases.

What CONSHARE Adds to the Equation

Tolerances That Prevent Stack-Up Surprises

Critical PCB-layout dimensions are held to ±0.05 mm across production. Across 98 positions, tolerance drift adds up — 0.05 mm of accumulated variation is the difference between clean card insertion and edge-finger damage at the assembly station.

QC Beyond Continuity Testing

Every production lot undergoes insertion-force profiling against a reference card-edge coupon, verified within the 1.15 N / 0.15 N window. A simple continuity test can miss weak spring retention or plating variation. Insertion-force profiling catches those defects before connectors reach your SMT line, where latent contact issues cost orders of magnitude more to diagnose and fix.

Supply Flexibility Larger Houses Do Not Offer

CONSHARE builds to your actual pull rate, not to an MOQ calibrated for someone else's business. Mixed plating orders — G/F and Au30u'' on the same PO — simplify incoming inspection for mixed-product builds. Process-level customizations are available without retooling: adjusted post length within the existing mold family, selective conformal coating on solder tails, or custom housing marking for production traceability.

Pre-Specification Checklist

Which plating should I choose?

BR09801A5K1ER (flash gold) for fixed-install consumer and office equipment. BR09801G5K1ER (Au30u'') for industrial, test-fixture, or field-serviceable systems where cards will be inserted more than a few times over the product life.

Can I use both variants on the same board?

Yes. Footprint, housing geometry, and guide post dimensions are identical across both part numbers.

Is it rated for lead-free soldering?

Yes. The LCP+30% G/F housing and tin-over-nickel solder tails are fully compatible with SAC305 wave and selective soldering profiles.

What is the operating temperature range?

-25 °C to +85 °C, covering commercial and light-industrial environments. For sustained high-temperature operation, contact CONSHARE for derating guidance.

What does the 50-cycle durability rating mean?

It is the baseline qualification for the connector family. The flash-gold variant is rated to this level; the Au30u'' variant exceeds it due to the thicker gold layer protecting the nickel underplate.

Ordering Information

For volume pricing, samples, or custom post configurations, contact the CONSHARE sales engineering team with your target quantity and end application.

Product Documentation