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Card Edge Connector
Industrial, IT Datacom
The CONSHARE M.2 8.5H Gen4.0 connector series represents a precision-engineered interconnect solution designed for next-generation embedded systems, industrial PCs, and high-performance computing platforms. Available in both E-Key and M-Key configurations, this 8.5mm board-height connector family delivers the signal integrity required for PCIe Gen4.0 data transmission while maintaining mechanical compatibility with a wide range of M.2 form-factor modules.
Built to the PCI-SIG PCI Express M.2 specification, these connectors support data rates up to 16 GT/s per lane, making them suitable for applications ranging from high-speed NVMe storage to wireless connectivity modules. The 67-position, 0.5mm pitch contact arrangement provides dense signal routing while the 8.5H profile offers ample clearance for double-sided modules and thermal solutions.
Parameter | E-Key (CUF001G67M142) | M-Key (CUF002G67M142) |
|---|---|---|
Board Height | 8.5mm | 8.5mm |
Key Type | E-Key | M-Key |
Contact Count | 67 pins | 67 pins |
Contact Pitch | 0.5mm | 0.5mm |
Mounting Type | SMD | SMD |
Orientation | 180° | 180° |
Contact Plating | Au 1μ" | Au 1μ" |
Gen Support | PCIe Gen4.0 | PCIe Gen4.0 |
One of the most critical yet often overlooked decisions in M.2 connector selection is board height. The CONSHARE 8.5H series occupies a strategic position in the M.2 height spectrum.
What 8.5mm delivers that lower profiles cannot:
Double-sided module compatibility — Many high-capacity SSDs and advanced wireless modules employ double-sided PCB designs. The 8.5H clearance accommodates components on both sides of the module without mechanical interference.
Thermal headroom — High-speed Gen4.0 modules generate significant heat. The 8.5mm height allows for proper airflow and, where needed, low-profile heatsink integration — a luxury not available with 2.1H, 3.2H, or even 4.2H connectors.
Mechanical robustness — The taller profile provides greater solder joint strain relief, particularly valuable in applications subject to vibration or repeated module insertion/removal.
For system designers balancing space constraints against thermal and mechanical requirements, 8.5H represents the "sweet spot" — tall enough for double-sided modules and thermal solutions, yet compact enough for most industrial and embedded form factors.
The M.2 specification defines multiple keying options to prevent incorrect module insertion and ensure electrical compatibility. CONSHARE offers both E-Key and M-Key variants to serve fundamentally different application domains.
The E-Key connector is primarily deployed in Socket 1 applications, designed for wireless connectivity modules including:
Wi-Fi / Wi-Fi 6E modules
Bluetooth modules
NFC (Near Field Communication) modules
GNSS / GPS receivers
Other wireless communication expansion cards
The E-Key pinout supports PCIe x2 lanes, USB 2.0, I2C, SDIO, and UART interfaces, providing the flexibility required for modern wireless modules that combine multiple communication protocols.
The M-Key connector is the standard for Socket 3 applications, primarily serving:
NVMe SSDs (PCIe x4)
High-performance storage modules
AI accelerators and compute modules
The M-Key supports PCIe x4 lanes, delivering the full bandwidth potential of Gen4.0 — up to approximately 8 GB/s for a four-lane configuration. This makes it the connector of choice for any application requiring maximum data throughput.
E-Key and M-Key modules are not interchangeable. An E-keyed WiFi card will not physically fit into an M-Key socket, and vice versa. This mechanical keying is intentional — it prevents electrical mismatch and ensures that modules are only installed in sockets designed for their specific interface requirements. When specifying your system, confirm both the physical key type and the electrical interface your module requires.
PCIe Gen4.0 operates at 16 GT/s — double the data rate of Gen3.0. At these speeds, connector design becomes a critical factor in overall channel performance.
What Gen4.0 demands from a connector:
Controlled impedance — Maintaining 85Ω differential impedance through the connector transition
Minimal insertion loss — Every decibel matters at 16 GT/s
Low return loss — Reflections degrade signal quality and reduce effective channel margin
Crosstalk management — Dense 0.5mm pitch contact arrangements must be carefully designed to minimize near-end and far-end crosstalk
The CONSHARE 8.5H Gen4.0 series is engineered to meet these stringent requirements, ensuring that the connector does not become the bottleneck in your high-speed channel. For system designers, this translates to:
Greater routing flexibility on the PCB
Reduced need for retimers or redrivers
Higher confidence in meeting PCIe Gen4.0 compliance
The contact plating on both CONSHARE E-Key and M-Key connectors is specified at Au 1μ" (1 microinch of gold over nickel underplate).
Why this specification matters:
Gold plating serves multiple critical functions in a connector:
Corrosion resistance — Prevents oxidation that would degrade contact resistance over time
Low and stable contact resistance — Essential for maintaining signal integrity
Wear resistance — Protects against fretting corrosion during module insertion and removal
The 1μ" gold thickness represents an optimal balance between performance and cost. For applications requiring higher durability — such as high-cycle-count test environments or field-serviceable systems — CONSHARE offers customization options with increased gold thickness (3μ", 10μ", 15μ", or 30μ").
The nickel underplate (typically 50μ" minimum) provides the adhesion layer and barrier against copper migration, ensuring long-term reliability.
Industrial computers require connectors that can withstand temperature extremes (-40°C to +80°C operating range), vibration, and extended service life. The CONSHARE 8.5H series is built with LCP housing material (UL94 V-0 rated) for dimensional stability across temperature cycles and flame retardancy. The 8.5H height provides clearance for the double-sided modules commonly used in industrial SSDs and wireless gateways.
Server environments demand maximum throughput and reliability. The M-Key variant (CUF002G67M142) supports PCIe x4 NVMe SSDs at Gen4.0 speeds, delivering the I/O performance required for database workloads, content delivery, and AI training data pipelines. The 8.5H height accommodates the enterprise-grade SSDs with integrated heatsinks that are increasingly common in data center deployments.
IoT gateways often combine wireless connectivity with local storage. The CONSHARE 8.5H series allows a single PCB to host both an E-Key WiFi/BT module and an M-Key storage module on separate sockets, enabling compact, multi-function edge devices without compromising on performance or thermal management.
Laptops, mini-PCs, and gaming consoles benefit from the 8.5H profile's ability to accommodate both standard and double-sided M.2 modules. The SMD termination supports automated pick-and-place assembly and reflow soldering, making it compatible with high-volume consumer electronics manufacturing.
CONSHARE connectors are manufactured to meet or exceed industry standards:
RoHS compliant — Free from restricted hazardous substances
HF compliant — Halogen-free construction
PCI-SIG compliant — Meets PCI Express M.2 specification requirements
UL94 V-0 rated — Flame-retardant housing material
CONSHARE maintains consistent production capacity and inventory levels, ensuring predictable lead times. For customers requiring immediate deployment, select configurations are available from stock. This supply chain reliability is particularly valuable for industrial customers who cannot afford production delays.
Beyond the standard 8.5H E-Key and M-Key configurations, CONSHARE offers customization capabilities:
Alternative gold plating thicknesses (3μ", 10μ", 15μ", 30μ")
Custom packaging and tape-and-reel configurations
Specialized marking and labeling
CONSHARE provides direct engineering support for integration questions, footprint validation, and signal integrity consultation — a level of service that component distributors cannot match.
Your module is a WiFi, Bluetooth, NFC, or GNSS card
You need PCIe x2, USB 2.0, I2C, SDIO, or UART interfaces
Your application is connectivity-focused
The module form factor is Socket 1 compatible
Your module is an NVMe SSD, storage device, or high-performance compute module
You need PCIe x4 bandwidth
Your application is storage or compute-focused
The module form factor is Socket 3 compatible
Industrial temperature range operation (-40°C to +80°C)
SMD automated assembly processes
Double-sided modules requiring 8.5H clearance
Gen4.0 (16 GT/s) and backward-compatible Gen3/Gen2/Gen1 operation
For footprint recommendations, reflow soldering profiles, or integration questions, contact CONSHARE's technical support team. Custom configurations — including alternative gold plating thicknesses, specialized packaging, or custom keying options — are available upon request.
CONSHARE — Connector + Share. Precision interconnect solutions engineered for performance, reliability, and value.
