Introduction
In our previous article, we introduced the operating principles, key characteristics, and selection criteria for TSS (Thyristor Surge Suppressor) devices. For details, please refer to our article: "TSS Semiconductor Surge Suppressors: Operating Principles, Key Parameters, and Selection Guide."
In practical electronic system design, selecting the appropriate protection scheme based on specific application scenarios is equally important.
This article focuses on the typical applications of TSS devices in RS485, CAN, SLIC, and industrial communication systems, analyzing how TSS helps enhance the surge immunity and long-term reliability of electronic equipment.
I. TSS Protection Thyristor for RS485 / RS422 Interfaces
1.1 Application Background
RS485 and RS422 are widely used in:
- Industrial automation;
- PLC control systems;
- Smart meters;
- Building control systems;
- Remote data acquisition systems.
Due to long communication distances and complex operating environments, communication cables are vulnerable to:
- Induced lightning strikes;
- Ground potential fluctuations;
- Surges caused by the startup and shutdown of industrial equipment.
TSS Protection Scheme: Communication Line → TSS → GND
Recommended Device: P0080SC
Typical Test:
IEC 61000-4-5 Surge
10/700μs waveform, 6KV
II. TSS Protection for CAN Bus Interfaces
Application Background
CAN bus technology is widely used in:
- Automotive electronics;
- New energy equipment;
- Industrial control systems;
- Robotics;
- Battery Management Systems (BMS).
Since CAN networks typically connect multiple nodes and operate in complex wiring environments, they are susceptible to:
- ESD (Electrostatic Discharge);
- Power supply transients;
- Surge interference.
Recommended Device: P0300SD
Typical Test:
IEC 61000-4-5 Surge
10/700μs waveform, 8 kV
III. SLIC (Subscriber Line Interface Circuit) TSS Protection Solution
Application Background
SLICs are used for telephone line interfaces. Because telephone lines connect to the external environment, they are susceptible to:
- Lightning surges;
- Power line contact;
- Induced overvoltage.
TSS Protection Solution: STP61089B
The Semiware STP61089B is a bidirectional overvoltage protection device specifically designed for:
- SLIC interfaces;
- Telephone line protection;
- Overvoltage protection for communication equipment.
Key Features:
- Bidirectional protection;
- Fast response;
- Low on-state voltage;
- Suitable for communication line protection.
IV. TSS Applications in Industrial Communication Equipment
In addition to RS-485, CAN, and SLIC, TSS devices are widely used in:
Industrial control equipment:
- PLCs;
- Industrial gateways;
- Data acquisition equipment.
Smart metering:
- Smart electricity meters;
- Water meters;
- Energy monitoring equipment.
Security equipment:
- Video surveillance;
- Access control systems;
- Remote monitoring equipment.
In practical surge protection designs, TSS devices are often used in combination with other protection components such as GDTs and TVS diodes. This multi-stage protection approach achieves higher surge withstand capability and lower residual voltage levels.
Conclusion
Semiware provides TSS, TVS, ESD protection devices, and GDT solutions to help engineers design reliable protection circuits for industrial and communication applications.
Please contact our technical team for component selection support or customized surge protection solutions.
