TJA1101B
TJA1101B is a high-performance automotive Ethernet PHY compliant to IEEE 100BASE-T1 with ASIL-A safety rating.
Product Overview
Description
The TJA1101B is a high-performance, single-port automotive Ethernet PHY compliant to IEEE 100BASE-T1.
It provides 100Mbps Ethernet connectivity over single unshielded twisted pair (UTP) cable up to 15 meters.
Designed according to ISO26262, it meets ASIL-A requirements to ease the design of safe vehicles.
Product Series
TJA
Primary Application
Automotive ADAS systems
Key Features
- IEEE 100BASE-T1 compliant for automotive Ethernet
- 100Mbps over single UTP cable up to 15m
- ASIL-A functional safety rating
- AEC-Q100 Grade 1 qualified
- OPEN Alliance TC-10 sleep/wake over data line
- No external filter or ESD protection needed on MDI
- Cable polarity detection and auto-correction
- Real-time signal quality indicator
- Small 6x6mm HVQFN package
Specifications
| Standard | IEEE 100BASE-T1 compliant |
|---|---|
| Data Rate | 100 Mbps |
| Cable | Single unshielded twisted pair (UTP) |
| Cable Length | Up to 15m |
| Safety | ISO26262 ASIL-A |
| Temperature | -40°C to +125°C (AEC-Q100 Grade 1) |
| ESD Protection | ±8kV IEC61000-4-2, IEC62228-5 Class IV |
| Package | HVQFN36 (6mm x 6mm) |
| Wake/Sleep | OPEN Alliance TC-10 compliant |
| Supply | Single 3.3V |
Applications
Automotive ADAS systems
Automotive and EV electronics
In-vehicle infotainment
Automotive and EV electronics
Surround view cameras
Electronic system design
Front view cameras
Electronic system design
V2X communications
Communication and interface
Automotive Ethernet networks
Automotive and EV electronics
FAE Expert Insights
"The TJA1101B is the go-to Ethernet PHY for automotive applications. The integration is excellent - no external filters or ESD protection needed on the MDI pins saves significant BOM cost and board space. The ASIL-A rating is essential for modern automotive designs. I've used this in ADAS camera modules where the small 6x6mm package is critical. The TC-10 wake/sleep capability eliminates dedicated wake lines, reducing cable harness cost and weight. The signal quality indicator helps diagnose installation issues in the field."
Automotive Ethernet PHY with ASIL-A safety rating
— David Chen, BeiLuo
Frequently Asked Questions
What is 100BASE-T1 and why is it important for automotive?
100BASE-T1 is the IEEE standard for 100Mbps Ethernet over a single unshielded twisted pair cable. It's designed specifically for automotive use, offering lower cost and weight compared to traditional Ethernet cabling. It enables high-speed data communication for ADAS, infotainment, and diagnostics while meeting automotive EMC requirements.
Use 100BASE-T1 for all automotive Ethernet applications. It's the industry standard.
What are the advantages of TJA1101B over standard Ethernet PHYs?
TJA1101B is specifically designed for automotive: ASIL-A safety rating, AEC-Q100 qualification, no external filters/ESD protection needed, cable polarity auto-correction, and TC-10 wake/sleep support. Standard Ethernet PHYs lack these automotive-specific features and qualifications.
Always use automotive-qualified PHYs like TJA1101B for vehicle applications.
How does TC-10 wake/sleep work?
TC-10 is the OPEN Alliance standard for sleep and wake-up signaling over the Ethernet data line. This eliminates the need for dedicated wake-up wires, reducing cable harness cost and weight. The TJA1101B can wake the system when Ethernet activity is detected, even when the main processor is in sleep mode.
Enable TC-10 to eliminate dedicated wake lines and reduce wiring cost.
What is the signal quality indicator used for?
The real-time signal quality indicator provides continuous monitoring of link quality. This helps diagnose installation issues, cable degradation, and connection problems. It's particularly useful during production testing and field diagnostics.
Monitor signal quality indicator for diagnostics and production testing.
Can TJA1101B be used in industrial applications?
While designed for automotive, TJA1101B can be used in industrial applications requiring robust Ethernet communication. The wide temperature range (-40°C to +125°C) and excellent EMC performance make it suitable for harsh industrial environments.
Consider TJA1101B for industrial applications requiring automotive-grade reliability.