Axial Lead Rectifiers # 1N5820RLG Schottky Barrier Rectifier Technical Documentation
Manufacturer : ON Semiconductor
## 1. Application Scenarios
### Typical Use Cases
The 1N5820RLG is a 3.0A Schottky barrier rectifier primarily employed in applications requiring low forward voltage drop and fast switching capabilities. Common implementations include:
Power Supply Circuits
- Switch-mode power supply (SMPS) output rectification
- DC-DC converter circuits
- Freewheeling diodes in buck/boost converters
- Reverse polarity protection circuits
High-Frequency Applications
- RF detector circuits
- High-speed switching power supplies (up to several MHz)
- Snubber circuits for reducing voltage spikes
- Clamping diodes in high-speed digital circuits
Industrial Systems
- Motor drive circuits
- Battery charging systems
- Solar power systems
- Uninterruptible power supplies (UPS)
### Industry Applications
Consumer Electronics
- Power adapters and chargers
- LCD/LED television power supplies
- Computer peripheral power circuits
- Gaming console power systems
Automotive Electronics
- Alternator rectification systems
- Power window controllers
- LED lighting drivers
- Infotainment system power supplies
Renewable Energy
- Solar panel bypass diodes
- Wind turbine rectifier circuits
- Battery management systems
Industrial Equipment
- PLC power supplies
- Motor controllers
- Welding equipment
- Test and measurement instruments
### Practical Advantages and Limitations
Advantages:
- Low Forward Voltage : Typically 0.85V at 3A, reducing power losses
- Fast Recovery Time : <10ns switching speed enables high-frequency operation
- High Efficiency : Lower power dissipation compared to standard PN junction diodes
- Temperature Performance : Maintains good characteristics up to 125°C junction temperature
- Surge Current Capability : Withstands 80A non-repetitive surge current
Limitations:
- Higher Reverse Leakage : Typically 1.0mA at 25°C, increasing with temperature
- Voltage Rating : Maximum 20V PRV limits high-voltage applications
- Thermal Considerations : Requires proper heat sinking at maximum current ratings
- Cost : Generally more expensive than standard rectifiers for equivalent current ratings
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Thermal Management Issues
- Pitfall : Overheating due to inadequate heat dissipation
- Solution : Implement proper PCB copper area (≥2cm²) and consider heatsinking for continuous 3A operation
Voltage Spikes and Transients
- Pitfall : Failure due to voltage exceeding 20V PRV
- Solution : Incorporate TVS diodes or RC snubber circuits for voltage spike protection
Reverse Recovery Concerns
- Pitfall : Ringing and oscillations in high-frequency circuits
- Solution : Use proper layout techniques and consider adding small ferrite beads
Current Sharing in Parallel Configurations
- Pitfall : Unequal current distribution when paralleling diodes
- Solution : Include small balancing resistors or use matched devices
### Compatibility Issues with Other Components
MOSFET Integration
- Compatible with most power MOSFETs in synchronous rectifier applications
- Ensure gate drive timing accommodates diode reverse recovery characteristics
Capacitor Selection
- Works well with ceramic, electrolytic, and film capacitors
- Consider ESR requirements for smoothing capacitor selection
Inductor Compatibility
- No significant compatibility issues with standard power inductors
- Ensure inductor current rating exceeds diode surge capability
Controller IC Integration
- Compatible with most PWM controllers (UC384x, TL494, etc.)
- Verify controller frequency limits match diode capabilities
### PCB Layout Recommendations
Power Path Routing
- Use wide
