GDR400A12
1200V 400A high-power diode rectifier module with 0.9V VF, ideal for large welding and plating power supplies.
Product Overview
Description
1200V 400A high-power diode rectifier module with 0.9V forward voltage. Ultra-high surge current capability for reliable operation.
62mm high-power package with excellent thermal performance. Low thermal resistance for ultra-high current applications.
In stock for large welding and plating applications. FAE support for thermal design and system optimization.
Product Series
1200V Diode
Primary Application
Key Features
- Low forward voltage drop: 0.9V at IF = 400A
- Ultra-high surge current capability: 4000A for 10ms
- Low reverse leakage: 15mA at VR = 1200V
- 62mm package with RthJC = 0.25K/W
- Fast reverse recovery: trr = 250ns typical
- High reliability for industrial applications
Specifications
| Voltage | 1200V |
|---|---|
| Current | 400A |
| Vf | 0.9V |
| Irrm | 15mA |
| Package | 62mm |
| Stock | In Stock |
| Slug | gdr400a12 |
Applications
Large welding machines
Industrial application for
High-current plating power supplies
Industrial application for
DC motor drives
Industrial application for
Industrial battery chargers
Industrial application for
Induction heating
Industrial application for
FAE Expert Insights
"GDR400A12 is Starpower's ultra-high current diode rectifier module, delivering exceptional performance for demanding applications like large welding machines and high-current plating power supplies. The 400A rating and 62mm package provide the current handling and thermal performance needed for these demanding applications. Customers appreciate the module's reliability and competitive performance compared to international brands."
Excellent for ultra-high current rectification
— Senior FAE, BeiLuo
Frequently Asked Questions
What is the forward voltage drop of GDR400A12?
GDR400A12 has a low forward voltage drop of 0.9V typical at rated current (IF = 400A) and 25°C junction temperature. The forward voltage has a positive temperature coefficient, increasing to approximately 0.8V at 125°C. This low VF minimizes conduction losses, improving overall rectifier efficiency. For a 400A rectifier, the conduction loss is 360W per diode at rated current. The low VF is achieved through advanced chip design and optimization of the conducting area. Starpower provides detailed forward characteristics curves in the datasheet.
Contact our FAE team for forward voltage analysis and efficiency calculations.
What is the thermal resistance of GDR400A12?
GDR400A12 in 62mm package has the following thermal characteristics: (1) Junction-to-case thermal resistance RthJC = 0.25K/W. (2) Maximum junction temperature Tj(max) = 150°C. (3) Recommended operating junction temperature Tj(op) = -40°C to +125°C. For continuous operation at 400A with 0.9V VF, the conduction loss is 360W, requiring a heatsink with thermal resistance of approximately 0.15K/W or better to maintain junction temperature below 125°C at 40°C ambient. Liquid cooling or high-performance forced air cooling is typically required for continuous operation at full current.
Contact our FAE team for thermal simulation and cooling system design.
Can GDR400A12 be used for large welding machine applications?
Yes, GDR400A12 is ideal for large welding machine applications. Its characteristics make it perfect for this demanding application: (1) 1200V rating provides adequate margin for 380-480VAC input rectification. (2) 400A current rating supports large welding power supplies up to 150-200kW. (3) Low VF of 0.9V minimizes conduction losses and heating. (4) Ultra-high surge current capability (4000A) withstands inrush currents during arc starting. (5) Fast reverse recovery (250ns) reduces switching losses in high-frequency welding. (6) Rugged 62mm package withstands vibration and thermal cycling in welding environments.
Contact our FAE team for large welding power supply design support and rectifier configuration.
What is the reverse recovery time of GDR400A12?
GDR400A12 has a fast reverse recovery time of 250ns typical at IF = 400A and di/dt = 400A/μs. The reverse recovery charge Qrr is approximately 100μC. Fast reverse recovery is important for high-frequency rectification and reduces switching losses in applications with rapid current commutation. The soft recovery characteristics minimize voltage overshoot and EMI. For standard 50/60Hz rectification, reverse recovery is not critical, but for high-frequency applications such as inverter welding, fast recovery reduces losses and improves efficiency.
Contact our FAE team for reverse recovery characteristics data and high-frequency rectification design.
How does GDR400A12 compare to GDR200A12?
GDR400A12 and GDR200A12 serve different current requirements: (1) GDR400A12 (400A, 62mm) is designed for ultra-high current applications requiring maximum current handling. (2) GDR200A12 (200A, 34mm) is for medium-to-high current applications. GDR400A12 has slightly higher VF (0.9V vs 0.85V) due to higher current density. The 62mm package has better thermal performance (0.25K/W vs 0.45K/W) but requires more sophisticated cooling. Selection depends on current requirements and cooling capabilities. For currents above 300A, GDR400A12 is the recommended choice.
Contact our FAE team for rectifier module selection based on your current and thermal requirements.
What is the surge current capability of GDR400A12?
GDR400A12 has ultra-high surge current capability for reliable operation under overload conditions: (1) Non-repetitive surge current IFSM = 4000A for 10ms half-sine wave. (2) Repetitive surge current capability depends on duty cycle and cooling. (3) I²t rating = 80,000 A²s for fuse coordination. This ultra-high surge capability ensures the module can withstand inrush currents during startup, capacitor charging, and fault conditions. For applications with frequent high-current transients, proper heatsinking and thermal management are essential to prevent junction temperature from exceeding limits during surge events.
Contact our FAE team for surge current analysis and protection coordination.