Diode R30440 Datasheet PDF learn more.
Functions: 400V, 800A, Silicon Power Rectifier.
Package information: TO-5 type
Manufacturer: Microsemi Corporation
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Description
R30440 is a silicon power rectifier diode from Microsemi’s standard catalog, designed for high-current applications with a peak reverse voltage of 400V and rugged glass-to-metal construction. It features a glass passivated die, high surge capability up to 800A, and excellent long-term reliability under demanding electrical conditions. This rectifier is typically used in industrial power supplies, battery charging systems, and heavy-duty rectification circuits.
Features
- Peak reverse voltage rating of 400V
- High surge current capability up to 800A
- Glass passivated die for enhanced reliability
- Hermetic glass-to-metal seal construction
- Available in standard JEDEC types (1N1188, 1N1188A)
- Supports reverse polarity versions (R-series)
- Wide voltage range family up to 1200V
Specifications
Absolute Maximum Ratings (Tc = 25 °C)
| Parameter | Symbol | Value | Unit |
| Peak Repetitive Reverse Voltage | VRRM | 400 | V |
| Average Forward Current | IF(AV) | 40 | A |
| Peak Surge Current (8.3ms) | IFSM | 800 | A |
| Forward Voltage Drop | VF | ~1.2 | V |
| Operating Junction Temperature | TJ | -65 to +175 | °C |
Design Notes
- Ensure proper heat sinking due to high forward current operation
- Use adequate spacing for high-voltage isolation in PCB layout
- Consider parallel or series configurations for higher current or voltage requirements
- Verify surge conditions in the application to avoid exceeding IFSM
- Use snubber circuits if switching transients are significant
Typical Circuit Usage
- Single-phase and three-phase rectifier bridges
- Battery charger rectification stages
- Industrial DC power supply front-end rectifiers
- Welding equipment power stages
- Motor drive DC bus rectification
How to Choose This Part
- Select VRRM with sufficient margin above peak system voltage
- Confirm average forward current rating matches load requirements
- Check surge current capability against inrush conditions
- Evaluate thermal design and cooling requirements
- Consider higher voltage variants for additional safety margin
Applications
- Industrial power conversion systems
- High-current DC supplies
- Battery charging systems
- Renewable energy inverters
- Heavy-duty rectification circuits
Alternative / Equivalent Products
- 1N1188 / 1N1188A
- Vishay VS-40HF40
- STMicroelectronics STTH4004
- ON Semiconductor RHRP4040
- IXYS DSSK40-0045B
[ … ]
R30440 PDF File
