Chip Varistors / Ceramic Transient Voltage Suppressors

Tech Notes

Product Overview[Marvell-Recommended] Chip Varistors for Automotive Ethernet Communication(100BASE-T1, 1000BASE-T1)

[Marvell-Recommended] Chip Varistors for Automotive Ethernet Communication, Compliant with the Open Alliance StandardMeasures to achieve the practical implementation of autonomous driving for automobiles are proceeding across the world. In order to reach that goal, the number of devices such as cameras and sensors installed in each automobile is increasing, with greater demands for their ability to quickly and accurately process information obtained from the areas around vehicle bodies.
Automotive Ethernet communication is an effective method of fulfilling these requirements, and the products in TDK's AVRH series of chip varistors have been designated as components recommended for use with Marvell ICs to function as ESD protective devices, essential components which can reliably support Marvell's Ethernet communications technology.

Marvell-Recommended ESD Protection Devices and Recommended Circuit Diagram

TDK's AVRH10C101KT4R7FA8 chip varistor has been designated as an ESD protection device recommended for the Marvell 88Q1010, which implements the Ethernet physical layer portion of the 100BASE-T1 standard.
Additionally, TDK's AVRH10C101KT1R1NE8 chip varistor has been designated as an ESD protection device recommended for the Marvell 88Q2110/88Q2112, which implements the Ethernet physical layer portion of the 1000BASE-T1 standard.
As shown by the recommended circuit diagram in Figure 1, it is preferable for these chip varistors to be installed in close proximity to connectors which are likely to generate static electricity/ESD.

Figure 1: Marvell-Recommended ESD Protection Devices and Recommended Circuit Diagram
Marvell-Recommended ESD Protection Devices and Recommended Circuit Diagram
Marvell-Recommended ESD Protection Devices and Recommended Circuit Diagram

Advantages of TDK's Chip Varistors over TVS Diodes

Countermeasures against static electricity and ESD which uses TVS diodes have the potential to cause communication errors when the immunity test is applied.
However, TDK's chip varistors have taken BCI tests and RF immunity into full consideration, and succesfully achieved high varistor voltage characteristics to prevent communication errors.

Figure 2: Advantages of TDK's Chip Varistors over TVS Diodes
Advantages of TDK's Chip Varistors over TVS Diodes
Advantages of TDK's Chip Varistors over TVS Diodes

Product Overview and Features of Chip Varistors for Automotive Ethernet Communication

- Recommended by Marvell
- Compliant with the AEC-Q200 automotive standard

Figure 3: Product Overview and Features of Chip Varistors for Automotive Ethernet Communication
Product Overview and Features of Chip Varistors for Automotive Ethernet Communication