Overview
While there is an abundance of mature ESD protection solutions on the market for low-voltage communication interfaces (such as 3.3V, 5V, 12V, 24V, and 36V), protecting interfaces with signal voltages of 60V or higher presents a unique challenge: how to ensure high voltage tolerance while minimizing the impact on signal integrity.
To address the protection needs of high-voltage communication interfaces, Semiware has introduced the SE3D65B60A—a high-voltage, low-capacitance ESD protection diode designed to provide reliable electrostatic discharge (ESD) and transient overvoltage protection for 60V communication signal lines.
1. Why Is 60V Communication Line ESD Protection Challenging?
The Challenge: Balancing High Voltage Tolerance and Low Capacitance
Most ESD protection devices are designed for applications ranging from 1.8V to 36V (or up to 48V), such as low-voltage communication interfaces, USB, and HDMI.
However, when the interface operating voltage reaches 60V, standard low-voltage ESD devices fail to meet the necessary voltage tolerance requirements.
While traditional high-power TVS diodes (such as the SMAJ60CA or SMBJ60CA) can withstand high voltages and surge energy, their junction capacitance often approaches 1nF; using such components on signal lines would severely compromise signal quality. This creates a significant design challenge for high-voltage communication systems.
2. SE3D65B60A: High-Voltage, Low-Capacitance ESD Protection Solution
The SE3D65B60A is an ESD protection diode specifically designed for high-voltage communication interfaces. Housed in a compact SOD-323 package, it achieves an optimal balance between high voltage tolerance, a small footprint, and low capacitance at a 60V operating voltage.
In industrial environments, communication interfaces are susceptible to transient high-voltage surges caused by factors such as miswiring, cable faults, connector anomalies, or equipment maintenance operations.
For instance, RS-485 interfaces deployed in the field may encounter transient voltage events exceeding 70V. Upon exceeding the breakdown voltage, the SE3D65B60A rapidly enters a protection state; by dissipating transient energy, it clamps the interface voltage within a safe range, thereby reducing the risk of damage to downstream communication chips.
3. SE3D65B60A Key Parameters
| Feature | Specification |
| Working Voltage (VRWM) | 60V |
| Package | SOD-323 |
| Peak Pulse Power | 650W |
| ESD Protection | IEC 61000-4-2 ±15kV Contact, ±20kV Air |
| Surge Current | 7A (8/20μs) |
| Clamping Voltage | 78V @ IPP=1A (8/20μs) |
| Clamping Voltage | 90V @ IPP=7A (8/20μs) |
| Junction Capacitance | Typ12pF |
4. Analysis of SE3D65B60A Advantages
4.1 Compact SOD-323 Package
Compared to traditional SMA or SMB packaged TVS devices, the SOD-323 package occupies less PCB space. It is suitable for compact industrial controllers, communication modules, and space-constrained electronic designs.
4.2 Low Capacitance for Signal Integrity
With a typical junction capacitance of only 12pF, it causes minimal interference with communication signals, making it ideal for data interfaces requiring stable signal transmission.
4.3 Reliable ESD and Surge Protection
- ±20kV air discharge, ±15kV contact discharge
- 650W peak pulse power capability
- 7A surge current
5. SE3D65B60A Application Areas
The SE3D65B60A is suitable for high-voltage communication protection applications, including:
Industrial Communication:
- RS-485 protection
- CAN bus protection
- PLC systems
- Industrial controllers
Smart Infrastructure:
- Smart meters
- Building automation systems
- Security control equipment
Automotive Electronics:
- In-vehicle communication modules
- Automotive control system interfaces
Conclusion
As industrial communication systems evolve toward higher voltage levels and more demanding application environments, traditional protection devices often struggle to balance voltage withstand capability with signal integrity. The SE3D65B60A high-voltage, low-capacitance ESD protection diode effectively addresses this challenge.
Please contact us to obtain SE3D65B60A samples or to receive technical support for high-voltage communication protection designs.
📩 https://en.semiware.com/contact/
🔗 Related Products
SOD-323 48V ESD Diode:
