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About
The LAN8670C2-E/LMX is a robust 10BASE-T1S Ethernet PHY transceiver developed by Microchip Technology for demanding industrial and automotive applications. Compliant with IEEE 802.3cg-2019 standards, this device enables reliable 10 Mbps half-duplex communication over single-pair Ethernet cabling. Its versatile architecture supports both multidrop configurations (up to 8 nodes) and point-to-point connections (up to 15 meters), making it particularly valuable for space-constrained installations in factory automation and distributed sensor networks.
This advanced transceiver features multiple interface options including MII, RMII, and SC-MII, ensuring broad compatibility with various host microcontrollers. The integrated Physical Layer Collision Avoidance (PLCA) and Application-Controlled Media Access (ACMA) technologies significantly enhance network efficiency by minimizing collisions and latency in shared-medium applications. Comprehensive diagnostic capabilities, including cable fault detection and Signal Quality Indication (SQI), provide critical monitoring functions for maintaining network integrity in challenging operating environments.
Packaged in a compact 32-pin VQFN (5×5 mm) format with wettable flanks, the LAN8670C2-E/LMX is designed for reliable surface-mount assembly in space-constrained PCB layouts. The device operates across an extended industrial temperature range from -40°C to +125°C and carries AEC-Q100 Grade 1 qualification, meeting rigorous automotive reliability requirements. An integrated 1.8V LDO regulator simplifies power supply design while ultra-low-power sleep modes (typically drawing just 8µA) support energy-efficient operation in power-sensitive applications.
The transceiver finds ideal applications in automotive systems (including ADAS and infotainment), industrial IoT implementations (such as PLCs and motor control), and building automation solutions (including lighting and HVAC systems). Its compliance with ISO 26262 ASIL-B safety standards makes it particularly suitable for deployment in safety-critical automotive functions. Microchip supports development with evaluation boards like the EVB-LAN8670-RMII, facilitating rapid prototyping and system integration.
Designed for reliability in harsh environments, the LAN8670C2-E/LMX combines robust performance with comprehensive diagnostic features. The device’s combination of industrial temperature operation, automotive qualification, and flexible interface options makes it a versatile solution for next-generation networked systems. Development resources including schematic symbols, PCB footprints, and 3D models are available to streamline the design process for engineers implementing this advanced Ethernet PHY solution.
Key Features
- Compliance: IEEE 802.3cg-2019 (10BASE-T1S)
- Data Rate: 10 Mbps half-duplex
- Network Topology Support:
- Multidrop (up to 8 nodes)
- Point-to-point (up to 15m)
- Host Interfaces:
- MII (Media Independent Interface)
- RMII (Reduced MII)
- SC-MII (Serial Control MII)
- Collision Management:
- PLCA (Physical Layer Collision Avoidance)
- ACMA (Application-Controlled Media Access) with TDMA support
- Diagnostics & Monitoring:
- Cable fault detection (open/short circuit)
- Signal Quality Indication (SQI)
- Power Management:
- Ultra-low-power sleep mode (~8µA typical)
- Wake-on-MDI support
- WAKE_IN/WAKE_OUT signaling
- Electrical & Packaging:
- 3.3V supply with integrated 1.8V LDO regulator
- 32-pin VQFN (5×5 mm) with wettable flanks
- Environmental & Compliance:
- Operating temperature: -40°C to +125°C
- AEC-Q100 Grade 1 qualified (automotive)
- ISO 26262 ASIL-B compliant
Applications
1. Automotive Systems
- Advanced Driver Assistance Systems (ADAS):
Enables high-reliability communication between sensors (e.g., cameras, radar) and control units, leveraging its AEC-Q100 Grade 1 qualification and ISO 26262 ASIL-B compliance for safety-critical functions 11. - In-Vehicle Infotainment (IVI):
Supports audio/video data transmission over single-pair Ethernet, reducing wiring complexity in modern vehicle architectures. - Electric Vehicle (EV) Management:
Used in battery management systems (BMS) and charging infrastructure due to its extended temperature range (-40°C to +125°C) and EMI resilience 11.
2. Industrial Automation
- Programmable Logic Controllers (PLCs):
Facilitates real-time communication between PLCs and I/O modules via MII/RMII interfaces, with PLCA ensuring deterministic latency in shared networks 11. - Motor Control Systems:
Connects motor drives and sensors in multidrop configurations (up to 8 nodes), ideal for factory automation 611. - Industrial IoT (IIoT):
Enables edge device connectivity in smart factories, with cable diagnostics (SQI) for maintenance prediction 11.
3. Building Automation
- HVAC Systems:
Links thermostats, valves, and controllers over 10BASE-T1S, reducing installation costs compared to traditional buses. - Lighting Control:
Supports networked lighting solutions with ultra-low-power sleep modes (8µA) for energy efficiency 11. - Security Systems:
Used in IP cameras and access control panels, benefiting from collision avoidance (PLCA/ACMA) in high-density deployments 11.
4. Sensor Networks
- Distributed Sensor Arrays:
Connects temperature, pressure, or vibration sensors in multidrop topologies, minimizing cabling in industrial plants 6. - Condition Monitoring:
Provides real-time data transmission for predictive maintenance, with fault detection for cable integrity checks 11.
5. Emerging Applications
- Agricultural Automation:
Deployed in soil sensors and irrigation systems, leveraging its rugged design for outdoor use. - Smart Grids:
Enables communication between smart meters and grid controllers in energy distribution networks.
Advantages
1. Simplified Network Architecture
- Enables single-pair Ethernet (SPE) connectivity, dramatically reducing wiring complexity and cost compared to traditional multi-pair Ethernet solutions
- Supports both multidrop (up to 8 nodes) and point-to-point (15m) configurations, providing flexible deployment options for various system architectures
- Eliminates the need for additional switches in small networks, reducing overall system cost and complexity
2. Superior Reliability in Harsh Environments
- Designed for mission-critical applications with robust operation across extreme temperatures (-40°C to +125°C)
- Features advanced cable diagnostics including open/short circuit detection and Signal Quality Indication (SQI) for proactive maintenance
- Incorporates AEC-Q100 Grade 1 qualification and ISO 26262 ASIL-B compliance, making it ideal for safety-critical automotive systems
3. Optimized Network Performance
- Implements PLCA (Physical Layer Collision Avoidance) for deterministic latency and maximum bandwidth utilization
- Supports ACMA (Application-Controlled Media Access) with TDMA capabilities for collision-free communication
- Provides consistent 10 Mbps performance even in electrically noisy industrial environments
4. Power Efficiency
- Features ultra-low-power sleep modes (as low as 8µA) for energy-sensitive applications
- Includes wake-on-MDI functionality for network-initiated wake-up capability
- Integrated 1.8V LDO regulator simplifies power supply design and reduces external component count
5. Design and Integration Benefits
- Compact 5x5mm VQFN package with wettable flanks enables high-reliability PCB assembly
- Supports multiple interface options (MII/RMII/SC-MII) for flexible host processor connectivity
- Reduces total system cost by minimizing external components through high integration
6. Future-Proof Solution
- Compliant with IEEE 802.3cg-2019 standard, ensuring long-term compatibility
- Enables smooth migration from legacy fieldbus systems to Ethernet-based architectures
- Provides a scalable solution that can grow with evolving network requirements
Specifications
| Category | Specification |
|---|---|
| General | |
| Product Category | Ethernet ICs |
| Product Type | Ethernet PHY (Physical Layer Transceiver) |
| Series | LAN867x (10BASE-T1S Family) |
| Part Number | LAN8670C2-E/LMX |
| Description | 10BASE-T1S Ethernet PHY with MII/RMII, PLCA, and ACMA support |
| Packaging | |
| Packaging | Tape & Reel (TR) |
| Package / Case | 32-VQFN (5×5 mm) with Wettable Flanks |
| Mounting Style | Surface Mount (SMD) |
| Performance | |
| Data Rate | 10 Mbps (Half-Duplex) |
| Standards Compliance | IEEE 802.3cg-2019 (10BASE-T1S) |
| Network Topology | Multidrop (up to 8 nodes) / Point-to-Point (15m) |
| Interface Types | MII, RMII, SC-MII |
| Features | |
| Key Features | – PLCA (Collision Avoidance) – ACMA (TDMA Support) – Cable Diagnostics (SQI, Fault Detection) – Wake-on-MDI – AEC-Q100 Qualified |
| Power Management | Ultra-Low Power Sleep Mode (Typ. 8µA) |
| Electrical | |
| Supply Voltage | 3.3V (Integrated 1.8V LDO) |
| Operating Temperature | -40°C to +125°C (Automotive/Industrial) |
| ESD Protection | ±8 kV (HBM) |
| Certifications | |
| Automotive Qualification | AEC-Q100 Grade 1 (-40°C to +125°C) |
| Functional Safety | ISO 26262 ASIL-B Compliant |
| Applications | |
| Target Markets | Automotive (EVs, ADAS), Industrial IoT, Building Automation, Sensor Networks |
| Ordering & Compliance | |
| RoHS Status | RoHS 3 Compliant |
Comparison with Similar Components
1. Microchip LAN8670C2-E/LMX vs. LAN8670C1-E/LMX (Variant Comparison)
| Parameter | LAN8670C2-E/LMX | LAN8670C1-E/LMX |
|---|---|---|
| Status | Active (Recommended for new designs) | Not recommended for new designs |
| Interfaces | MII, RMII, SC-MII | MII, RMII |
| Package | 32-VQFN (5×5 mm) | 32-VQFN (5×5 mm) |
| Temperature Range | -40°C to +125°C | -40°C to +125°C |
| Key Difference | Adds SC-MII support + newer revision | Legacy variant with limited interfaces |
2. Microchip LAN8670C2-E/LMX vs. Texas Instruments DP83TD510E
| Parameter | LAN8670C2-E/LMX | DP83TD510E |
|---|---|---|
| Topology Support | Multidrop (8 nodes) + Point-to-Point (15m) | Multidrop (8 nodes) + Point-to-Point (25m) |
| Host Interfaces | MII, RMII, SC-MII | MII, RMII, SPI |
| Collision Mgmt. | PLCA + ACMA (TDMA) | PLCA-only |
| Diagnostics | Cable fault detection + SQI | SQI + Link Quality Indication |
| Power Efficiency | 8µA sleep mode | 10µA sleep mode |
| Automotive Grade | AEC-Q100 Grade 1 + ASIL-B | AEC-Q100 Grade 1 |
3. Microchip LAN8670C2-E/LMX vs. NXP TJA1103
| Parameter | LAN8670C2-E/LMX | TJA1103 |
|---|---|---|
| Host Interfaces | MII, RMII, SC-MII | RMII-only |
| Power Management | Wake-on-MDI + WAKE_IN/OUT | Wake-on-Link |
| Package | 32-VQFN (5×5 mm) | 32-HVQFN |
| Diagnostics | Open/short detection + SQI | SQI + Loopback mode |
| Safety | ISO 26262 ASIL-B | ISO 26262 ASIL-B |
4. Microchip LAN8670C2-E/LMX vs. Analog Devices ADIN1100
| Parameter | LAN8670C2-E/LMX | ADIN1100 |
|---|---|---|
| Topology | Multidrop + Point-to-Point | Point-to-Point only |
| Host Interface | MII, RMII, SC-MII | SPI-only |
| Power Consumption | 8µA sleep mode | 15µA sleep mode |
| Industrial Focus | Automotive + Industrial | Industrial-only |
| Safety | ASIL-B | None |
5. Microchip LAN8670C2-E/LMX vs. LAN8650B0-E/LMX (SPI Variant)
| Parameter | LAN8670C2-E/LMX | LAN8650B0-E/LMX |
|---|---|---|
| Host Interface | MII, RMII, SC-MII | SPI-only |
| Data Rate | 10 Mbps | 10 Mbps |
| Transceivers | 1/1 | 2 |
| Voltage | 3.3V (1.8V LDO integrated) | 2.5V |
| Use Case | Automotive/Industrial | Low-power IoT |
Summary of Competitive Advantages
- Interface Flexibility:
- LAN8670C2 supports MII/RMII/SC-MII, outperforming SPI-only and RMII-only alternatives
- Collision Management:
- PLCA + ACMA combination provides deterministic latency
- Automotive Readiness:
- Combines AEC-Q100 Grade 1 + ASIL-B certifications
- Diagnostic Depth:
- Cable fault detection + SQI offers superior monitoring
- Power Efficiency:
- 8µA sleep mode bests competitors’ power consumption
Recommendations by Use Case
- Automotive: LAN8670C2 (ASIL-B + multidrop)
- Industrial IoT: DP83TD510E (25m point-to-point) or LAN8670C2
- Low-Power SPI Systems: LAN8650B0 (2.5V operation)
Frequently Asked Questions (FAQs)
General Questions
- What is the LAN8670C2-E/LMX?
A 10BASE-T1S Ethernet PHY transceiver from Microchip Technology supporting MII/RMII/SC-MII interfaces. - What standards does it comply with?
IEEE 802.3cg-2019 (10BASE-T1S). - What is the operating temperature range?
-40°C to +125°C (AEC-Q100 Grade 1). - Is it suitable for automotive applications?
Yes, it’s AEC-Q100 qualified and ASIL-B compliant. - What package does it use?
32-pin VQFN (5×5 mm) with wettable flanks.
Technical Specifications
- What data rate does it support?
10 Mbps half-duplex. - What network topologies are supported?
Multidrop (up to 8 nodes) and point-to-point (up to 15m). - What host interfaces are available?
MII, RMII, and SC-MII. - Does it include a voltage regulator?
Yes, an integrated 1.8V LDO. - What is the typical sleep mode current?
8µA.
Features & Functionality
- What is PLCA?
Physical Layer Collision Avoidance for deterministic latency. - What is ACMA?
Application-Controlled Media Access (TDMA support). - What diagnostic features are included?
Cable fault detection (open/short) and Signal Quality Indication (SQI). - Does it support wake-on-MDI?
Yes, for network-triggered wake-up. - Is loopback mode available?
No (unlike NXP’s TJA1103).
Comparison & Alternatives
- How does it compare to TI’s DP83TD510E?
Adds ACMA (TDMA) but has shorter point-to-point range (15m vs. 25m). - What’s the difference between LAN8670C1 and C2 variants?
C2 adds SC-MII support. - Why choose this over NXP’s TJA1103?
More interface options (MII/RMII/SC-MII vs. RMII-only). - Is there an SPI-only alternative?
Yes, Microchip’s LAN8650B0-E/LMX. - How does it compare to Analog Devices’ ADIN1100?
Supports multidrop (ADIN1100 is point-to-point only).
Design & Integration
- What evaluation boards are available?
EVB-LAN8670-RMII and EVB-LAN8670-USB. - Is there a reference design?
Yes, Microchip provides schematics and layout guidelines. - How to handle PCB layout for EMI?
Follow IEEE 802.3cg guidelines for single-pair Ethernet. - Are there footprint libraries available?
Yes, on Ultra Librarian and Microchip’s website. - What magnetics are required?
None (10BASE-T1S uses capacitive coupling).
Power Management
- What is the supply voltage range?
3.3V ±10%. - Can it operate at 2.5V?
No (use LAN8650B0 for 2.5V systems). - How to minimize power consumption?
Utilize sleep mode (8µA) and wake-on-MDI. - Does it support power-down modes?
Yes, via software control. - What’s the typical active power consumption?
~150mW (depends on configuration).
Applications
- What are typical automotive uses?
ADAS, infotainment, and battery management. - Can it be used in industrial PLCs?
Yes, for deterministic communication between PLCs and I/O modules. - Is it suitable for building automation?
Yes (HVAC, lighting control). - How is it used in sensor networks?
Connects distributed sensors via multidrop topology. - Does it work in agricultural IoT?
Yes, rugged design suits outdoor environments.
Troubleshooting
- How to diagnose cable faults?
Use built-in open/short detection and SQI. - What if signal quality is poor?
Check termination resistors and cable length (<15m for point-to-point). - Why is link negotiation failing?
Verify host interface settings (MII/RMII clocking). - How to resolve EMI issues?
Ensure proper grounding and shield cable routing. - What if the PHY doesn’t wake from sleep?
Check WAKE_IN/OUT pin connections.
Certifications & Compliance
- Is it RoHS compliant?
Yes. - Does it meet industrial EMC standards?
Yes (IEC 61000-4-x). - Is functional safety documentation available?
Yes (ISO 26262 ASIL-B reports). - Are there automotive test reports?
Yes (AEC-Q100 qualification data). - Does it require special ESD handling?
Standard ESD precautions (HBM ±8 kV).
Purchasing & Support
- Where can I buy samples?
Authorized distributors like TG Microchip. - What’s the minimum order quantity?
Typically 1+ for samples, 490+ for bulk. - How long is the lead time?
Usually 6-8 weeks (check distributor stock). - Is there free technical support?
Yes, via Microchip’s support portal. - Where are the datasheets and application notes?
On Microchip’s product page.
Datasheet
LAN8670C2-E/LMX Microchip Technology datasheet
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