What is 1N5819? – 1A, 40V, Diode, Schottky Barrier Rectifier

What is 1N5819?

This is a Schottky diode that is commonly used in electronic circuits. It has a low forward voltage drop and a fast switching speed, making it useful for applications such as voltage regulation, rectification, and power supply protection. The diode is rated for a maximum voltage of 40V and a maximum current of 1A.

Function : 40V, 1.0 Ampere Schottky Barrier Rectifier, Diode

Package: DO-41 type

Manufacturer: Fairchild Semiconductor



Advantages Vs Disadvantages


1. Low forward voltage drop reduces power dissipation and improves efficiency in voltage regulation and rectification circuits.
2. Fast switching speed makes it useful in applications that require rapid switching, such as power supply protection circuits.
3. High surge current capability allows the diode to handle short-term overloads without damage.
4. Low reverse leakage current minimizes power losses and improves circuit performance.


1. Low maximum rated voltage and current limit the diode’s usefulness in high-power applications.
2. The low forward voltage drop can cause the diode to conduct even with low forward bias voltages, which can be a problem in some circuits.
3. The high switching speed can cause ringing and other unwanted effects in some circuits, which may require additional circuit design measures to mitigate.


This is Schottky Barrier Rectifier.

1. 1.0 ampere operation at TA = 90°C with no thermal runaway.
2. For use in low voltage, high frequency inverters free wheeling, and polarity protection applications.

Absolute Maximum Ratings and Characteristics


Absolute Maximum Ratings (Ta = 25°C)

1. Maximum Repetitive Reverse Voltage: Vrrm = 40V

2. Average Rectified Forward Current: IF(AV) = 1A

3. Power Dissipation : 1.25 W

5. Operating Junction: Tj = -65 to +150 °C

6. Storage temperature: Tstg = -65 to +150 °C


1N5819 Datasheet

1N5819 pdf



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MOC3021 Datasheet – Optoisolator Triac Driver – Fairchild

The MOC3021 Series consists of gallium arsenide infrared emitting diodes, optically coupled to a silicon bilateral switch. To order devices that are tested and marked per VDE 0884 requirements, the suffix ”V” must be included at end of part number. VDE 0884 is a test option. They are designed for applications requiring isolated triac triggering.

Part Number: MOC3021


Package: DIP 6 Pin

Manufacturer: Fairchild Semiconductor

Fairchild Semiconductor Corporation, a semiconductor manufacturing company, was acquired by ON Semiconductor Corporation on September 18, 2016.


MOC3021 Optocoupler


This is an optocoupler that consists of an LED and a photo-triac device. It is designed for use in isolation applications to control AC loads using DC signals. It has a high isolation voltage and low coupling capacitance, which makes it suitable for use in high voltage and noise-sensitive environments.



MOC3021 datasheet


1. Optocoupler with an LED and a photo-triac device

2. Designed for use in isolation applications to control AC loads using DC signals

3. High isolation voltage and low coupling capacitance

4. Available in a 6-pin DIP and SMD packages

5. Provides isolation between input and output circuits, which enhances safety and reduces noise interference

6. Can control AC loads using low voltage DC signals, which simplifies circuit design

7. Low coupling capacitance reduces the risk of false triggering

8. Easy to use and widely available

Recommended for 115/240 Vac(rms) Applications:

1. Solenoid/Valve Controls
2. Static ac Power Switch
3. Lamp Ballasts
4. Solid State Relays
5. Interfacing Microprocessors to 115 Vac Peripherals
6. Incandescent Lamp Dimmers
7. Motor Controls

Q/A 1.

How does this IC is provide isolation between input and output circuits?

This IC uses an optocoupler design, which consists of an LED and a photo-triac device. The LED is driven by a low voltage DC signal, and when it turns on, it activates the photo-triac, which in turn switches on an AC load. The input and output circuits are physically separated by the optocoupler, which provides electrical isolation between them.


MOC3021 Datasheet PDF Download

MOC3021 pdf


Other data sheets are available within the file: MOC3021-M, MOC3022, MOC3023, MOC3023-M