1N5819 Schottky Barrier Rectifier Diode

Overview

1N5819 Schottky Barrier Rectifier Diode designed for high-speed switching, low forward voltage drop, and efficient low-voltage power applications. A popular Schottky diode widely used in DC-DC converters, reverse polarity protection, battery-powered devices, solar circuits, switching power supplies, and embedded electronics.

Unlike standard silicon rectifier diodes, the 1N5819 offers significantly lower forward voltage drop and faster switching speed, making it ideal for high-efficiency power circuits and modern embedded systems.

Specifications

Parameter	Value
Model	1N5819
Diode Type	Schottky Barrier Rectifier
Package	DO-41
Maximum Reverse Voltage	40V
Average Forward Current	1A
Peak Surge Current	25A
Forward Voltage Drop	~0.45V – 0.6V
Reverse Recovery Time	Very Fast (<5ns typical)
Power Dissipation	1W
Operating Temperature	-65°C to +125°C
Mounting Type	Through-Hole

Pin Configuration

Pin	Description
Anode	Positive Terminal
Cathode	Negative Terminal (Band Side)

The band marking indicates the cathode terminal.

Features

• Low forward voltage drop — higher power efficiency
• Fast switching speed — ideal for high-frequency circuits
• Schottky barrier technology
• Low power loss
• 1A current capability
• Suitable for DC-DC converters
• Excellent reverse polarity protection
• High-speed rectification
• Low heat generation
• Widely used in embedded systems

Common Applications

• DC-DC buck converters
• Boost converters
• Solar power circuits
• Reverse polarity protection
• Battery charging systems
• SMPS power supplies
• Flyback protection
• High-frequency switching circuits
• IoT devices
• Portable electronics

1N5819 vs 1N4007

Feature	1N5819	1N4007
Diode Type	Schottky	Silicon Rectifier
Reverse Voltage	40V	1000V
Forward Voltage Drop	~0.45V	~1.1V
Switching Speed	Very Fast	Slow
Power Efficiency	High	Medium
Heat Generation	Lower	Higher
Best For	Low-voltage switching	High-voltage rectification

Wiring Example

Reverse Polarity Protection

1N5819	Circuit
Anode	Power Input
Cathode	Circuit VCC

DC-DC Converter

Diode	Connection
Anode	Switching Node
Cathode	Output Filter

Common Applications in Embedded Systems

The 1N5819 is commonly used with:

• ESP32 projects
• STM32 systems
• Arduino power circuits
• Battery-powered IoT devices
• Solar charging systems
• Portable electronics
• Smart home products

Package Includes

• 1× 1N5819 Schottky Diode

Notes

• Lower voltage drop than standard silicon diodes
• Best suited for low-voltage applications
• Not suitable for very high reverse voltage circuits
• Observe correct polarity during installation
• Cathode side marked with band
• Common SMD equivalent: SS14