iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Marvell announced the 88Q222xM family on October 7, 2020 as a dual-speed automotive Ethernet physical-layer transceiver (PHY) with integrated IEEE 802.1AE MACsec. The 88Q2220M and 88Q2221M were reported as sampling with development boards at launch; that historical statement does not establish current stock or lifecycle status.
There is also an important ownership change: Marvell completed the $2.5 billion all-cash sale of its Automotive Ethernet business to Infineon on August 14, 2025. Marvell’s current automotive information says the business has moved to Infineon, so this should be read as a historical Marvell launch and a technical reference, not a current Marvell automotive product announcement.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
|
Intrepid Control Systems RAD-Moon 2 | Media Converter | MateNET Connectors | 100BASE-T1 Phy | 4-Wire... | $859.00 | Buy on Amazon |
What did Marvell announce?
The 88Q222xM family was designed for point-to-point in-vehicle links using automotive single-pair Ethernet. Marvell described it as supporting both 100BASE-T1 and 1000BASE-T1, with MACsec integrated into the PHY device rather than requiring a separate security component in the link path.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Marvell’s October 2020 release identified two devices, the 88Q2220M and 88Q2221M, and said both were sampling with development boards. The release did not provide a current supply commitment, production-lifecycle statement or independent availability confirmation.
#1 Best Overall
- Power Source: Product is powered by an industry-standard USB Type C or Barrel Jack, making it convenient to use with most devices
- Physical Layer: Features a 100/1000BASE-T1 via Marvell 88Q2112 PHY
- Device Configuration: Membrane switches allow switching between 100BASE-T1 and 1000BASE-T1, and selecting master, slave or automatic PHY configuration
- Durable Design: Constructed with a rugged aluminum enclosure with rubber bumpers, providing durability and protection
- Connectivity: Comes with TE MateNET connectors for 1000BASE- T1 connection and standard RJ-45 for 10/100 Ethernet connection
What does an automotive Ethernet PHY do?
A PHY is the physical-layer transceiver: it converts Ethernet data into electrical signals for transmission over the vehicle link and converts received signals back into data for the host network equipment. The 88Q222xM was intended for automotive single-pair Ethernet over unshielded twisted pair, with the following capabilities attributed to Marvell:
- 100BASE-T1 operation under IEEE 802.3bw
- 1000BASE-T1 operation under IEEE 802.3bp
- Integrated IEEE 802.1AE MACsec
- Open Alliance TC10 sleep and wake support
- IEEE 802.1AS and IEEE 802.1AS-Rev Precision Time Protocol support
Because the PHY sits at the link endpoint, its security and timing features apply to that Ethernet segment. They do not, by themselves, secure every network in a vehicle.
What is 1000BASE-T1?
1000BASE-T1 is the automotive single-pair Ethernet variant for 1 Gbit/s links. The “T1” designation indicates operation over one twisted pair rather than the four pairs commonly associated with conventional gigabit copper Ethernet. Marvell paired it with 100BASE-T1, the 100 Mbit/s variant, so a design could select link speed according to bandwidth, cost and network-domain requirements.
The 88Q222xM announcement described compliance with IEEE 802.3bp for 1000BASE-T1 and IEEE 802.3bw for 100BASE-T1. Those standards references describe the Ethernet physical interface; they are not a promise of a particular cable length, vehicle topology or system throughput beyond the applicable link specification.
What is MACsec?
MACsec is IEEE 802.1AE Media Access Control Security. It protects Ethernet frames at Layer 2 on an individual link. Marvell characterized its implementation as hop-by-hop protection against intrusion, man-in-the-middle and replay attacks.
Hop-by-hop means that protection is applied between neighboring authenticated endpoints. A frame can be protected on one vehicle link, decrypted at the next network device and then protected again on the following link. Vehicle-wide confidentiality, authentication policy, key management and protection of higher-layer applications still require system-level design beyond the PHY.
Marvell’s launch statement called the device “the industry’s first automotive gigabit Ethernet PHY that integrates Layer 2 security through MACsec” and described its power performance as meeting stringent budgets. Those are Marvell promotional claims, not independent comparative test results. A Technica Engineering technical fellow similarly said MACsec could add security while keeping systems deterministic and reducing communication-stack complexity; that statement is also an attributed partner comment.
How does MACsec protect in-vehicle Ethernet?
- Authenticate the link endpoints. The two connected Ethernet devices establish the trust relationship required by the system’s MACsec configuration.
- Protect frames at Layer 2. MACsec adds integrity protection and, where configured, confidentiality to Ethernet traffic on that hop.
- Reject altered or replayed traffic. The security mechanism is intended to detect manipulation and prevent previously captured frames from being accepted again.
- Repeat at each protected hop. A routed or switched vehicle network may need MACsec policy on multiple links; one secured PHY does not automatically extend protection end to end.
The announcement does not establish independent penetration-test results, key-management behavior for a complete vehicle architecture or security coverage outside the protected Ethernet segment.
Why does TC10 matter?
Open Alliance TC10 defines automotive Ethernet sleep and wake behavior. Marvell said TC10 support enables partial networking: selected vehicle network segments can sleep while other segments remain active, then wake when needed.
The company also said control signals can travel over the data line, reducing the need for dedicated remote-control cables. That explains the architectural benefit, but the release supplied no measured power-saving figure. Actual energy results depend on the network design, wake policy, transceiver configuration and vehicle operating conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What other automotive features were listed?
| Feature | Marvell’s 2020 description | What it means for a design team |
|---|---|---|
| Time synchronization | IEEE 802.1AS and 802.1AS-Rev PTP support | Provides a standards-based basis for synchronizing networked nodes; system timing accuracy depends on the complete network. |
| Automotive qualification | AEC-Q100 Grade 1, -40°C to 125°C | Indicates the qualification grade and temperature range stated in the announcement; confirm current documentation for a production program. |
| Package | 40-pin, 6.0 × 6.0 mm QFN | Defines the stated package footprint for board-layout and thermal planning. |
| Power integration | Integrated voltage regulators | May reduce external power circuitry, subject to the reference design and electrical requirements. |
| Software process | ASPICE Level 2 software | Describes the software-process level Marvell listed; it is not a substitute for project-specific safety or cybersecurity evidence. |
How does the 88Q222xM fit Marvell’s later portfolio?
In 2021, Marvell announced additional MACsec-integrated automotive PHYs. The 88Q2233M was described as a dual 1000BASE-T1 device, while the 88Q120xM family was described for 100BASE-T1. Both announcements included MACsec and TC10 in their feature descriptions. These are later, distinct product families and should not be treated as alternate names for the 88Q222xM.
Who owns Marvell Automotive Ethernet now?
Infineon owns the former Marvell Automotive Ethernet business following completion of the $2.5 billion all-cash transaction on August 14, 2025. Marvell’s current automotive page says the business has moved to Infineon. For a new design, contact Infineon or an authorized channel and request current datasheets, software, evaluation hardware, qualification records, security documentation and lifecycle information for the exact SKU.
What should engineers verify before designing in?
- Whether the required link is 100BASE-T1, 1000BASE-T1 or a design needing both speeds.
- MACsec endpoint compatibility, cipher and key-management requirements, and the number of protected hops.
- TC10 behavior, wake sources and partial-networking timing in the target network.
- PTP requirements under IEEE 802.1AS, including synchronization accuracy for the complete topology.
- AEC-Q100 grade, temperature limits, package documentation and board-level thermal constraints.
- Current Infineon ownership, ordering status, software collateral, product-change notices and long-term availability.
The 2020 sampling announcement is useful for understanding the architecture and chronology. It is not evidence that 88Q2220M or 88Q2221M can still be purchased, supported or qualified for a current vehicle program.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
