M.2 Key A.E. to PCIe 3.0 x4 Female Extension Cable

M.2 Key A.E. to PCIe 3.0 x4 Female Extension Cable

The M.2 Key A.E. to PCIe 3.0 x4 Female Extension Cable is a versatile interface conversion solution that enables PCIe expansion from an M.2 Key A+E slot to a standard PCIe 3.0 x4 female connector. This cable takes the PCIe lanes available in a typical M.2 Key A or Key E interface (usually one or two lanes, depending on the host implementation) and routes them to a physical x4 slot, allowing the installation of PCIe x4, x2, or x1 cards in systems that lack traditional full‑size PCIe slots. The cable is particularly valuable for compact platforms such as mini‑PCs, all‑in‑one computers, and embedded systems, where M.2 Wi‑Fi slots are often the only expansion option. While the physical connector is x4, the actual data bandwidth is limited by the host M.2 slot's lane count—typically x1 (up to 8 GT/s for PCIe 3.0) or, in some cases, x2—making this cable ideal for low‑ to medium‑bandwidth peripherals such as NVMe SSD adapters, network interface cards, USB expansion cards, and sound cards. Engineered with a shielded flexible cable assembly, robust latching, and precise impedance control, this cable ensures reliable signal integrity at PCIe 3.0 speeds and provides a cost‑effective, mechanically adaptable solution for system integration, prototyping, and upgrades.

Features

• The cable features an M.2 Key A+E male connector on the host side, which is compatible with standard M.2 slots designed for Wi‑Fi or Bluetooth modules, providing access to the available PCIe lane(s), clock signals, and power rails (3.3V) from the host system.
• On the target end, the cable presents a standard PCIe 3.0 x4 female connector (physical x4 slot), accepting any PCIe x4, x2, or x1 card. The slot is keyed and mechanically compliant with standard PCIe add‑in cards, allowing straightforward installation without proprietary adapters.
• The cable supports PCIe 3.0 signalling with a per‑lane data rate of up to 8.0 GT/s. The total throughput depends on the number of lanes actually connected from the host M.2 slot—typically only one lane (x1) on most Key A+E implementations, yielding approximately 8 Gbps of raw bandwidth, while some motherboards may provide two lanes (x2) for up to 16 Gbps. The physical x4 slot enables future‑proofing and mechanical compatibility with higher‑width cards, even if they operate at reduced lane counts.
• To maintain signal integrity over the cable length, the assembly employs precision‑matched 30 AWG twin‑axial conductors for each differential pair, with individual foil shielding and an overall braid plus outer foil shield. This multilayer shielding minimises insertion loss, crosstalk, and electromagnetic interference, ensuring clean signal transmission at PCIe 3.0 frequencies.
• The flexible cable jacket allows tight‑radius bends and neat routing within congested chassis, improving internal airflow and simplifying cable management. The M.2 connector is equipped with a standard retention clip (compatible with onboard screw mounts) to secure the host connection, while the PCIe female connector features a robust latching mechanism to hold the installed card firmly in place.
• The cable is a passive assembly with no active redrivers or retimers, adding negligible latency and consuming no additional power from the host. It is fully backward compatible with PCIe 2.0 and 1.0 devices, ensuring versatile integration into older systems.
• Custom lengths are available, with standard options typically ranging from 3 cm to 100 cm, allowing flexible placement of the expansion card relative to the motherboard.

Specifications

• Product Name: M.2 Key A.E. to PCIe 3.0 x4 Female Extension Cable
• Host Interface: M.2 Key A+E Male (compatible with Key A or Key E slots)
• Target Interface: PCIe 3.0 x4 Female (physical x4 slot, straight orientation; right‑angle variants also available upon request)
• Data Transfer Rate: Up to 8.0 GT/s per lane (PCIe 3.0); total bandwidth depends on host lane count (typically x1, up to x2 on some systems)
• Supported Protocols: PCI Express 3.0, backward compatible with PCIe 2.0 and 1.0
• Lane Configuration: Physical x4 slot; electrical lanes provided are those available from the host M.2 (usually x1, occasionally x2)
• Cable Type: Shielded flexible cable assembly with differential pair shielding
• Cable Length: Standard options include 20 cm, 25 cm, 30 cm, 35 cm, 40 cm, 45 cm; custom lengths from 3 cm to 100 cm available upon request
• Wire Gauge: 30 AWG for data pairs; appropriate gauge for power and sideband signals
• Shielding: Individual pair foil shielding + overall braid and outer foil shield
• Impedance: 85 ohm ± 10% (differential) for data pairs
• Insertion Loss: Optimised for PCIe 3.0 channel budget (typical < 1.0 dB at 4 GHz)
• Operating Temperature: 0°C to +70°C (standard commercial grade)
• Storage Temperature: -40°C to +85°C
• Power Delivery: Provides 3.3V power from the host M.2 slot (typically up to 3A) to the connected PCIe card; 12V is not available from the M.2 Key A+E interface, so the cable is best suited for cards that operate on 3.3V only or have their own external power input
• Compatibility: Windows, Linux, macOS (no additional drivers required)

RoHS Compliance: Yes, fully compliant with RoHS and REACH directives

Applications

• This cable is ideal for adding NVMe storage to compact systems that lack an M.2 Key M slot but have an available Key A+E slot. By connecting an NVMe SSD adapter card (x4 physical, x1 or x2 electrical), users can significantly expand storage capacity and performance in mini‑PCs, NUCs, and all‑in‑one desktops.
• It is also well‑suited for network upgrades, allowing installation of multi‑gigabit Ethernet adapters (2.5 GbE or 5 GbE) in systems that rely on onboard 1 GbE ports. The x4 physical slot accommodates full‑size network cards, while the actual bandwidth is sufficient for typical network throughput.
• For USB expansion, the cable enables the use of USB 3.2 Gen 1 or Gen 2 host controller cards, adding extra high‑speed ports to systems with limited USB connectivity. The x4 slot provides mechanical stability for larger cards.
• In industrial and embedded applications, the cable facilitates integration of specialised I/O cards, such as serial port multiplexers, CAN bus controllers, or data acquisition modules, into space‑constrained enclosures where only M.2 expansion is available.
• Prototyping and development environments benefit from the flexibility of placing PCIe cards away from the motherboard, allowing easier access for probing, debugging, and thermal management. The physical x4 slot also enables testing of x4 cards even when the host only provides fewer lanes.
• OEMs and system integrators can offer this cable as an optional accessory to end‑users, enabling custom expansion without requiring motherboard redesigns, and the straight or right‑angle options suit various chassis layouts.
• Educational and DIY projects can leverage this cable to experiment with PCIe expansion on affordable platforms, learning about interface conversion and system integration while utilising widely available x4 add‑in cards.

For custom lengths, special jacket materials, alternative orientations (straight, upward right‑angle, downward right‑angle), or other modifications, please contact our sales team to tailor the cable to your specific system requirements.

P3-M2AE-X4F

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