1N5819 Schottky Diode 40V 1A (5-Pack)
1N5819 Schottky Diode 40V 1A (5-Pack)
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1N5819 Schottky Diode — 40V / 1A, DO-41 Package (5-Pack)
The 1N5819 is a high-speed Schottky barrier rectifier diode rated at 40V reverse voltage and 1A continuous forward current, with an exceptionally low forward voltage drop of just 0.34V @ 0.1A. Its metal-to-silicon junction construction gives it significantly lower Vf and faster switching than standard PN-junction diodes, making it ideal for low-voltage power circuits, motor drivers, and high-frequency rectification.
Key Specifications
| Parameter | Value |
|---|---|
| Peak Reverse Voltage (Vᴿ) | 40V |
| Forward Current (Iᶠ) | 1A continuous |
| Peak Surge Current (Iᶠₛₘ) | 25A (8.3ms) |
| Forward Voltage Drop (Vᶠ @ 0.1A) | 0.34V |
| Switching Speed | >2MHz |
| Package | DO-41 (axial leads) |
| Polarity | Silver band = cathode |
| Manufacturer | Fairchild / ON Semiconductor |
Why Use a Schottky Diode?
- Low forward voltage drop (0.3–0.4V) — vs. 0.6–0.7V for standard silicon diodes; reduces power loss in rectifier circuits
- Fast switching (>2MHz) — suitable for high-frequency switching power supplies and inverters
- Reverse polarity protection — low Vf minimizes heat in battery and power supply protection circuits
- Flyback suppression — used as freewheeling diodes across motor driver outputs and relay coils
Typical Applications
- Reverse polarity protection in battery-powered circuits
- Freewheeling diode for motor driver ICs (L298N, DRV8833, etc.)
- Low-voltage rectifier in switching power supplies
- High-frequency inverter and DC-DC converter circuits
- Solar panel blocking diode
- OR-ing diodes for redundant power supplies
Frequently Asked Questions
Q: What is the difference between 1N5819 and 1N4001?
The 1N4001 is a standard PN-junction rectifier with ~0.7V forward drop and slow recovery. The 1N5819 is a Schottky diode with ~0.34V forward drop and >2MHz switching speed — use the 1N5819 where low voltage drop or fast switching is required.
Q: Can I use the 1N5819 for reverse polarity protection?
Yes. Its low 0.34V forward drop makes it one of the best choices for series reverse polarity protection in low-voltage circuits, minimizing power loss compared to standard diodes.
Package Contents
- 5× 1N5819 Schottky Diode (DO-41, 40V/1A)
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