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Card Edge Connector
Industrial, IT Datacom
PCIe 5.0 doubles the data rate to 32 GT/s compared to Gen 4. That is not just a number on a spec sheet — it changes how you evaluate every component in the channel.
At this speed, the connector ceases to be a passive interconnection. It becomes a discontinuity that must be managed. Ground resonances that were invisible at lower frequencies now introduce insertion loss and crosstalk that can push a channel past the compliance limit. The margin for error shrinks dramatically.
For hardware engineers, this means the connector selection process needs to be different. Legacy assumptions — "a connector is a connector" — no longer apply. The question is not whether a part is rated for Gen 5, but whether it has the electrical characteristics to preserve signal fidelity across temperature, across mating cycles, and across the life of the system.
CONSHARE's 164-pin SMT card edge connector is built with this reality in mind.
Design Parameter | Value |
|---|---|
Compliance | PCIe CEM 5.0 |
Lane width | x16 |
Contact count | 164 |
Pitch | 1.00 mm |
Contact finish | Gold, 30μ" |
Mounting | Surface mount |
Current per pin | 1.1A |
Operating range | -40°C to +105°C |
Mating cycles | 50 |
The connector sits between the motherboard trace and the add-in card pad. Any impedance mismatch at this junction creates reflections that degrade the eye opening. CONSHARE maintains 85Ω differential impedance through the contact interface — matched to the PCIe CEM requirement — so the signal sees a consistent environment from board to board.
Initial contact resistance is specified at ≤30 mΩ, with a post-environmental limit of ≤50 mΩ. The importance of this spec is not the number itself, but what it represents: a contact interface that does not drift. In high-speed signaling, resistance variation translates to amplitude variation at the receiver. Stable contact resistance means the receiver sees a consistent signal level, cycle after cycle.
With 164 contacts packed at 1.00 mm pitch, adjacent differential pairs are physically close. At 32 GT/s, the coupling between pairs becomes a real concern. The connector's contact geometry and ground distribution are optimized to maintain isolation — keeping the signal on each lane from bleeding into its neighbors.
The connector is rated from -40°C to +105°C. That temperature range is not about survival — it is about performance. The housing material and contact design are selected so that impedance and resistance do not shift meaningfully across the operating window. A connector that passes compliance at room temperature but fails at 85°C is not a Gen 5 connector.
The connector is designed for IR reflow soldering at a peak temperature of 260°C, with a recommended duration of 3 to 5 seconds at peak. This aligns with standard lead-free solder profiles used in high-volume SMT assembly. The 0.15mm stencil thickness recommendation is not arbitrary — it provides the right solder volume for reliable fillet formation without creating bridging between the fine-pitch contacts.
Each reel is packed with 10 empty positions at the leading end and 10 at the trailing end, with 200mm of extra tape at the end to facilitate feeding. This ensures consistent pickup by the placement machine and reduces the risk of mis-picks. The reel is secured with tape to prevent separation during shipping — a small detail that matters when you are running a 24-hour production line.
The connector is designed for the standard PCIe card thickness of 1.57 mm (0.062"). The contact normal force and beam geometry are optimized for this thickness, providing consistent contact pressure without excessive insertion force that could stress the SMT solder joints.
PCIe 5.0 x16 accelerator cards are becoming the standard interface for AI inference and training workloads. The 164-pin configuration provides the full lane width these cards require, with the signal integrity margin to handle the sustained high-throughput data flows between accelerators and host processors.
Enterprise NVMe SSDs and storage adapters operating at Gen 5 speeds demand connectors that can handle both the signal rate and the thermal environment of dense storage chassis. The 1.1A per pin current rating supports the power delivery requirements of these high-performance storage devices.
200G and 400G NICs rely on PCIe 5.0 host interfaces. In 2U and 1U chassis, space is constrained — the SMT form factor and vertical orientation enable dense placement of multiple connectors on the motherboard without compromising routing density.
The -40°C to +105°C operating range opens up applications beyond enterprise IT. Outdoor telecom equipment, industrial control systems, and edge computing nodes often experience temperature extremes that consumer-grade connectors cannot tolerate.
The connector is rated for 50 mating cycles. In most server and storage applications, add-in cards are installed once and remain in place for the life of the system. Fifty cycles is more than adequate. However, if your application involves frequent card swapping — test fixtures, development platforms, or field-upgradeable systems — this is a parameter to evaluate against your use case.
Insertion force is specified at ≤1.15N per contact pair, and withdrawal force at ≥0.15N per pair. These values provide a secure mechanical mate without requiring excessive force that could damage the PCB or the SMT attachment. The connector stays in place under vibration — the withdrawal force ensures that — but does not require a lever or special tool for insertion.
The 30μ" gold plating on the contact mating area provides wear resistance across the rated mating cycles. This is thicker than the 15μ" flash plating found on many standard connectors. The practical difference: 30μ" maintains stable contact resistance over more cycles and in environments with higher vibration or thermal cycling. For production systems where field failures are expensive, this additional margin is meaningful.
At 1.1A per pin, the 164-pin array can carry significant current. The contact resistance — even at the post-test limit of 50 mΩ — creates I²R heating that must be accounted for in system-level thermal design. The connector itself is rated for 105°C, but the surrounding PCB and components may have lower limits. This is not a connector issue — it is a system design issue that the connector's specifications enable you to address.
CONSHARE ships in tape-and-reel format optimized for automated SMT assembly. Each reel includes protective leading and trailing empty positions, with the tape secured to prevent unwind during transit. Cartons include corner protectors, desiccant, and PE bags to maintain component condition through the supply chain.
Twenty years of precision connector manufacturing inform every aspect of this product. CONSHARE's facility operates 15 production lines with 54 sets of precision processing equipment, supported by a technical team of over 200 personnel. ISO9001:2015 certification and RoHS compliance are baseline requirements, not differentiators.
The differentiator is this: CONSHARE builds connectors to the specifications that Gen 5 designs actually demand — not to the minimum that the standard allows. When your channel budget is tight and every millivolt of margin matters, the connector is not where you compromise.
