M.2 Slot: Width 22mm standard, PCIe Lanes x2, x4

Component Specifications

Definition

The M.2 slot, formerly known as Next Generation Form Factor (NGFF), is a standardized internal expansion interface designed for motherboards and other computing devices. It supports multiple protocols including PCI Express (PCIe) and SATA, enabling direct connection of SSDs, Wi-Fi cards, Bluetooth modules, and other peripherals without cables. The interface features a compact form factor with keying notches (B-key, M-key, or B+M) that determine supported protocols and device types. M.2 slots support various lengths (2230, 2242, 2260, 2280, 22110) and widths, with thermal management considerations for high-performance devices.

Working Principle

The M.2 slot operates by providing direct electrical and mechanical connection between the motherboard and M.2 devices through edge connectors. It utilizes PCIe lanes for high-speed data transfer (up to PCIe 4.0 x4 or PCIe 5.0 x4) or SATA interface for compatibility with older standards. The slot's keying system prevents incompatible devices from being installed, while the screw mounting mechanism ensures secure physical attachment. Data transmission occurs through differential signaling pairs, with power delivery managed through the connector pins.

Materials

Gold-plated copper alloy contacts, FR-4 glass epoxy PCB substrate, phosphor bronze or beryllium copper spring contacts, nickel-plated steel mounting hardware, high-temperature resistant plastics for housing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Width	22mm standard
Interface	PCIe 3.0/4.0/5.0, SATA III, USB 3.0
Key Types	B-key, M-key, B+M key
PCIe Lanes	x2, x4
NVMe Support	Yes
Maximum Speed	Up to 16 GT/s (PCIe 5.0 x4)
Power Delivery	3.3V, up to 8.25W (2.5A)
Supported Lengths	2230, 2242, 2260, 2280, 22110 (mm)
Operating Temperature	0°C to 70°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO/IEC 14776-153, PCI-SIG M.2 Specification, SATA-IO SATA Revision 3.0

Parent Products

This component is used in the following industrial products

Motherboards

The main printed circuit board (PCB) in a computer that connects and allows communication between all hardware components.

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Engineering Analysis

Risks & Mitigation

Incorrect device installation due to key mismatch
Thermal throttling from inadequate cooling
Electrical damage from static discharge
Mechanical damage from improper insertion force
Compatibility issues with older motherboard BIOS

FMEA Triads

Trigger: Incorrect key alignment during installation
Failure: Physical damage to connector pins, device not recognized
Mitigation: Implement visual key indicators, provide installation guides with clear orientation markings

Trigger: Inadequate thermal management for high-performance SSDs
Failure: Thermal throttling, reduced performance, premature device failure
Mitigation: Include thermal pads in design, implement motherboard heatsinks, provide airflow recommendations

Trigger: Static electricity during handling
Failure: Electrostatic discharge damage to sensitive components
Mitigation: Implement ESD protection circuits, provide anti-static handling procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Pin alignment tolerance ±0.15mm, connector insertion force 30-50N, withdrawal force 10-30N

Test Method

PCI-SIG compliance testing, insertion/withdrawal cycle testing (minimum 50 cycles), thermal cycling testing (-40°C to 85°C), signal integrity testing with eye diagram analysis

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

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Manufacturers of M.2 Slot

Manufacturer profiles associated with M.2 Slot.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Edge Connector

Edge connector is a printed circuit board (PCB) connector that mates with the edge of another PCB, commonly used in high-speed memory modules for reliable electrical connections.

Frequently Asked Questions

What is the difference between B-key and M-key M.2 slots?

B-key slots (with notch at pin 12-19) typically support SATA and PCIe x2 interfaces, while M-key slots (notch at pin 59-66) support PCIe x4 interfaces. B+M key devices are compatible with both slot types but may have limited functionality.

Can I install any length M.2 device in any M.2 slot?

No, M.2 slots support specific device lengths (typically 2280). The motherboard must have appropriate mounting holes and clearance for the device length. Always check motherboard specifications for supported lengths.

Do all M.2 slots support NVMe SSDs?

Only M.2 slots with PCIe interface support NVMe SSDs. Some M.2 slots only support SATA interface, which cannot run NVMe drives. Check motherboard specifications for interface support.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

M.2 Slot