GLASS PASSIVATED JUNCTION TRANSIENT VOLTAGE SUPPRESSOR VOLTAGE - 5.0 TO 180 Volts 5000Watts Peak Pulse Power # Technical Documentation: 5KP28A TVS Diode
*Manufacturer: GS*
## 1. Application Scenarios
### Typical Use Cases
The 5KP28A is a 5kW transient voltage suppression (TVS) diode designed for robust overvoltage protection in demanding electronic systems. Primary applications include:
Power Supply Protection
- AC/DC power supply input stages
- Switching power supply output protection
- DC power bus transient suppression
- Battery charging systems
Interface Protection
- RS-232/422/485 communication lines
- Industrial Ethernet ports
- Automotive CAN bus systems
- Telecom line cards and base stations
Industrial Control Systems
- PLC I/O module protection
- Motor drive circuits
- Sensor interface protection
- Relay and solenoid coil suppression
### Industry Applications
Automotive Electronics
- ECU protection against load dump transients
- 12V/24V automotive bus systems
- Electric vehicle power distribution
- Charging station interface protection
Telecommunications
- Central office equipment
- DSL modems and routers
- PBX system protection
- Wireless base station power supplies
Industrial Automation
- Factory automation controllers
- Motor drive units
- Process control instrumentation
- Robotics control systems
Consumer Electronics
- High-end audio/video equipment
- Gaming console power supplies
- Home automation systems
- Smart appliance controllers
### Practical Advantages and Limitations
Advantages:
- High Power Handling : 5000W peak pulse power capability
- Fast Response Time : Typically <1.0 ps response to transients
- Low Clamping Voltage : Effective protection for sensitive components
- Bidirectional Operation : Suitable for AC and bidirectional DC circuits
- Robust Construction : Axial lead package for easy mounting and heat dissipation
Limitations:
- Parasitic Capacitance : ~1500pF typical, limiting high-frequency signal applications
- Physical Size : Axial package requires adequate PCB space
- Voltage Derating : Requires careful consideration for high-temperature environments
- Cost Consideration : Higher cost compared to lower-power TVS devices
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Incorrect Voltage Rating Selection
- Problem : Selecting TVS with standoff voltage too close to operating voltage
- Solution : Maintain 10-20% margin above maximum operating voltage (28V standoff for ≤25V systems)
Pitfall 2: Inadequate Power Rating
- Problem : Underestimating transient energy in the system
- Solution : Calculate worst-case transient energy and ensure 5KP rating exceeds requirements
Pitfall 3: Poor Placement
- Problem : TVS placed too far from protected component
- Solution : Position within 1-2 cm of protected interface with minimal trace inductance
Pitfall 4: Thermal Management
- Problem : Overheating during repeated transients
- Solution : Provide adequate copper area for heat dissipation, consider thermal vias
### Compatibility Issues with Other Components
With Microcontrollers and ICs
- Ensure clamping voltage (38.5V max) doesn't exceed protected IC maximum ratings
- Consider combined protection with series resistors for current limiting
With Power Supplies
- Coordinate with input fuses and circuit breakers
- Ensure TVS doesn't interfere with power supply soft-start circuits
With Communication Interfaces
- Parasitic capacitance may affect high-speed data lines (>10MHz)
- For sensitive analog circuits, consider lower capacitance TVS alternatives
With Other Protection Devices
- Coordinate varistor and TVS response characteristics
- Ensure proper sequencing with crowbar circuits
### PCB Layout Recommendations
Placement Strategy
- Position as close as possible to protected connector or component
- Minimize lead length to reduce
