M.2 Key A.E. to PCIe 4.0 x4 Female Extension Cable

M.2 Key A.E. to PCIe 4.0 x4 Female Extension Cable

The M.2 Key A.E. to PCIe 4.0 x4 Female Extension Cable is a high‑performance interface conversion solution that enables PCIe expansion from an M.2 Key A+E slot to a standard PCIe 4.0 x4 female connector. This cable routes the available PCIe lanes from a host M.2 Wi‑Fi slot to a physical x4 slot, allowing the installation of PCIe x4, x2, or x1 add‑in cards in systems that lack traditional full‑size PCIe slots. The physical x4 connector provides mechanical compatibility with a wide range of peripherals, including NVMe SSD adapters, high‑speed network interface cards, USB 3.2 Gen 2x2 host controllers, video capture cards, and industrial I/O modules. While the connector is x4, the actual electrical lane count and total bandwidth are determined by the host M.2 implementation—most Key A+E slots provide only one lane (x1) at PCIe 4.0 speeds (up to 16 Gbps raw bandwidth), while some systems may offer two lanes (x2) for up to 32 Gbps. Engineered to support PCIe 4.0 data rates of 16.0 GT/s per lane, the cable employs precision‑matched twin‑axial conductors, tight impedance control, and comprehensive multilayer shielding to maintain signal integrity over practical extension lengths. The passive copper design introduces no active retimers, ensuring near‑zero latency and minimal power consumption. This cable is an ideal, cost‑effective solution for compact systems, prototyping, and embedded applications where space is limited but high‑bandwidth PCIe expansion is desired.

Features

• The cable features an M.2 Key A+E male connector on the host side, compatible with standard M.2 slots commonly used for Wi‑Fi or Bluetooth modules. It provides access to the available PCIe lane(s), clock signals, and 3.3V power from the host system.
• On the target end, the cable presents a standard PCIe 4.0 x4 female connector in a straight orientation. This physical x4 slot accepts any PCIe x4, x2, or x1 add‑in card, offering broad mechanical compatibility with off‑the‑shelf peripherals. The slot is keyed and compliant with standard PCIe mechanical specifications.
• The cable supports PCIe 4.0 signalling with a per‑lane data rate of up to 16.0 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 16 Gbps of raw bandwidth, while some motherboards may provide two lanes (x2) for up to 32 Gbps. The physical x4 connector enables future‑proofing and mechanical compatibility with higher‑width cards, even if they operate at reduced lane counts.
• To maintain signal integrity at the higher frequencies of PCIe 4.0, the cable employs precision‑matched 30 AWG twin‑axial conductors for each differential pair, with individual foil shielding, an overall braid, and an outer foil shield. This multilayer shielding minimises insertion loss, crosstalk, and electromagnetic interference, ensuring clean signal transmission over the cable length.
• 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 features a standard retention clip (compatible with onboard screw mounts) to secure the host connection, while the PCIe female slot provides robust latching to hold the installed card firmly in place.
• As a passive copper assembly with no active redrivers or retimers, the cable adds negligible latency and consumes no additional power from the host. It is fully backward compatible with PCIe 3.0, 2.0, and 1.0 devices, enabling seamless integration into mixed‑generation systems.
• Custom lengths are available upon request, 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 4.0 x4 Female Extension Cable
• Host Interface: M.2 Key A+E Male (compatible with Key A or Key E slots)
• Target Interface: PCIe 4.0 x4 Female, Straight orientation (physical x4 slot)
• Data Transfer Rate: Up to 16.0 GT/s per lane (PCIe 4.0); total bandwidth depends on host lane count (typically x1, up to x2 on some systems)
• Supported Protocols: PCI Express 4.0, backward compatible with PCIe 3.0, 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 high‑speed 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 4.0 channel budget (typical < 1.5 dB at 8 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 high‑performance 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 (physical x4) to the cable, users can achieve PCIe 4.0 storage speeds (subject to host lane count) in mini‑PCs, NUCs, all‑in‑one desktops, and thin clients, significantly boosting data transfer rates for demanding workloads.
• It is also well‑suited for high‑speed networking upgrades, enabling installation of multi‑gigabit Ethernet adapters (2.5 GbE, 5 GbE, or 10 GbE) in systems with limited expansion options. The physical x4 slot supports full‑height or low‑profile network cards, and the straight orientation is ideal for chassis where the card can be mounted parallel to the motherboard.
• For USB expansion, the cable enables the use of USB 3.2 Gen 2x2 (20 Gbps) or USB4 host controller cards, adding high‑throughput external connectivity to systems that lack modern USB ports. The x4 slot provides mechanical stability for larger controller cards.
• In video production and streaming, the cable allows connection of PCIe capture cards to compact systems, enabling high‑quality recording and streaming from HDMI or SDI sources without requiring a full‑size PCIe slot. The straight orientation works well in chassis with ample space along the board.
• Industrial and embedded computing applications benefit from the cable’s ability to add specialised I/O cards, such as CAN bus controllers, serial port multiplexers, or data acquisition modules, to space‑constrained enclosures where only M.2 expansion is available.
• Prototyping and development environments gain flexibility by placing PCIe cards away from the motherboard, simplifying probing, debugging, and thermal management. The straight orientation provides a direct, low‑profile connection suitable for test benches and development rigs.
• OEMs and system integrators can offer this cable as an optional accessory to enable custom expansions without motherboard redesigns. The straight connector is a versatile choice for a variety of chassis layouts and is often the default option for standard builds.
• Educational and DIY enthusiasts can use this cable to explore PCIe 4.0 expansion on affordable platforms, learning about high‑speed interface conversion and system integration while using widely available x4 add‑in cards.

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

P4-M2AE-X4F

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