1N5819 Schottky Diode 1A 40V – Fast Switching for Power Supplies
1N5819 Schottky Diode – 1A 40V Fast Rectifier
The 1N5819 is a Schottky barrier rectifier diode with an average forward current of 1A and a peak repetitive reverse voltage of 40V. It is widely used for reverse polarity protection, DC-DC converters, and low-voltage rectification thanks to its low forward voltage drop and fast switching speed. Its high efficiency makes it a go-to component for power-sensitive applications.
Key Specifications
| Specification | Value |
|---|---|
| Peak Repetitive Reverse Voltage (VRRM) | 40V |
| Average Forward Current (IF(AV)) | 1A |
| Forward Voltage Drop (VF) at 1A | 0.6V typical |
| Reverse Leakage Current (IR) at 25°C | 1mA max |
| Junction Capacitance | 110pF |
| Package | DO-41 axial lead |
What You Can Build With This
- Reverse polarity protection circuit for battery-powered devices
- Step-down buck converter for 5V or 3.3V supplies
- Bypass diode for solar panels to prevent reverse current
- Flyback diode for relays and inductive loads
Compatibility
The 1N5819 works with all common microcontrollers and boards operating at 3.3V or 5V logic, such as Arduino Uno, ESP32, and Raspberry Pi. It pairs well with voltage regulators like the LM7805 or MP1584 in DC-DC converter designs and is often used alongside MOSFETs for efficient power switching.
Wiring Notes
For reverse polarity protection, connect the anode to positive input and cathode to the load. The low forward voltage drop ensures minimal power loss compared to standard silicon diodes. Always ensure current stays below 1A and add a heat sink if operating near the limit.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, the 1N5819 works with 5V Arduino boards. Use it for reverse polarity protection by placing it in series with the power input; the low forward voltage drop minimizes power loss.
Can I use this for a 12V circuit?
The 1N5819 is rated for up to 40V, so it is suitable for 12V circuits. Ensure the current does not exceed 1A average forward current.
What is the difference between 1N5819 and 1N4007?
The 1N5819 is a Schottky diode with a lower forward voltage drop (around 0.6V at 1A) and faster switching, while the 1N4007 is a standard silicon rectifier with a higher drop (~1V) and slower recovery. Choose the 1N5819 for efficiency in low-voltage applications.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items