Description
The 1N5399 is a high-performance general-purpose silicon rectifier. It bridges the gap between the popular 1A 1N4007 and the 3A 1N5408, offering a 1.5A current rating while maintaining a high 1000V voltage threshold.
Technical Specifications
| Parameter | Rating |
| Average Rectified Forward Current ($I_O$) | 1.5 A |
| Peak Repetitive Reverse Voltage ($V_{RRM}$) | 1000 V |
| Non-Repetitive Peak Surge Current ($I_{FSM}$) | 50 A (8.3 ms) |
| Forward Voltage Drop ($V_F$) | ~1.4 V (at 1.5A) |
| Package Type | DO-15 (Axial) |
Why choose the 1N5399?
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“Middle Ground” Capacity: If your project draws slightly more than 1A (which would push a 1N4007 to its limit) but doesn’t require the bulkiness or cost of a 3A 1N5408, the 1N5399 is the ideal, compact choice.
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Compact Footprint: It comes in a DO-15 package. While slightly larger than the 1N4007 (DO-41), it is significantly more compact than the 1N5408 (DO-201AD), making it better suited for space-constrained PCB designs.
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Robust Surge Handling: With a 50A surge rating, it provides better protection against inrush currents than the 1N4007 (30A) without taking up significantly more board space.
Important Design Considerations
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Standard Recovery: Like the other rectifier diodes in this family, it is a standard recovery diode. It is optimized for 50/60 Hz rectification and is not suitable for high-frequency switching applications.
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Thermal Considerations: Because it is smaller than the 1N5408, it relies heavily on its leads for heat dissipation. When soldering this into a circuit, do not trim the leads too short; longer leads allow for better thermal transfer to the PCB traces, keeping the junction cool.
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Polarity: The silver band on the body identifies the Cathode (-), while the side without the band is the Anode (+).
Comparison Overview
| Diode | Current (IO) | Voltage (VRRM) | Package |
| 1N4007 | 1.0 A | 1000 V | DO-41 |
| 1N5399 | 1.5 A | 1000 V | DO-15 |
| 1N5408 | 3.0 A | 1000 V | DO-201AD |
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