1N5819 Schottky Diode 40V 1A (5-Pack)

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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