1N5819 Schottky Diode: Specifications, Features, Equivalent

2026-03-01

The 1N5819 is one of the most widely used low-power Schottky rectifier diodes. Known for its low forward voltage drop and extremely fast switching speed, it is ideal for high-efficiency power circuits, DC-DC converters, and protection applications.

This guide covers the 1N 5819 diode’s specifications, features, equivalents, applications, testing methods, and comparisons.

1. What is the 1N5819 Schottky Diode?

2. 1N5819 Diode Specifications

3. Schottky 1N5819 Key Features

4. Common Applications of the 1N5819

5. 1N5819 Diode Equivalent and Replacement

6. 1N5819 Pinout and CAD Model

7. How to Test a IN5819 Diode

8. 1N5819 vs 1N4007

9. Frequently Asked Questions [FAQ]

1N5819

What is the 1N5819 Schottky Diode?

The 1N5819 is a low-drop power Schottky rectifier diode rated at 40V reverse voltage and 1A forward current. It uses a Schottky barrier junction instead of a traditional PN junction, allowing it to operate with a much lower forward voltage drop and faster switching speed.

Because of these characteristics, the diode design for efficient operation in low-voltage and high-frequency circuits. Commonly use in low-voltage power supplies, high-frequency inverters, freewheeling (flyback) protection in inductive circuits, reverse polarity protection, and small battery chargers.

Its low power loss and rapid switching performance make it a reliable choice for energy-efficient electronic designs.

1N5819 Diode Specifications

Electrical Specifications

Parameter	Specification
Diode Type	Schottky Barrier Rectifier
Maximum Repetitive Reverse Voltage (VRRM)	40 V
RMS Reverse Voltage (VRMS)	28 V
DC Blocking Voltage	40 V
Average Forward Rectified Current (IF(AV))	1 A
Peak Repetitive Forward Current	1 A
Peak Surge Forward Current (IFSM, 8.3ms half sine)	25 – 30 A
Forward Voltage (VF @ 1A)	0.45 V (typical)
Forward Voltage (VF @ 0.5A)	0.35 V (typical)
Reverse Leakage Current (IR @ 40V)	0.5 - 1 mA (typical, 25°C)
Reverse Leakage Current (High Temp)	Higher at elevated temperatures
Junction Temperature (TJ)	−65°C to +150°C
Typical Thermal Resistance (RθJA, DO-41)	~75 °C/W
Typical Thermal Resistance (RθJL)	~25 °C/W
Reverse Recovery Time	Practically zero (Schottky type)
Capacitance (Typical)	~110 pF
Avalanche Capability	Specified
Package Types	DO-41, DO-15, DO-214AC
Mounting Type	Through-hole / Surface Mount
Polarity Marking	Cathode indicated by band

Packaging Options

The IN5819 Schottky diode is available in both through-hole and surface-mount packages to suit different assembly methods and circuit designs.

IN5819 DO-41 dimensions

Axial DO-41 is the most common through-hole package. It features a cylindrical body with axial leads, making it suitable for general-purpose PCB mounting, prototyping, and power applications requiring good heat dissipation.

Axial DO-15 is a slightly larger through-hole package that offers improved thermal handling and mechanical strength, making it suitable for applications where require higher surge currents or better heat management.

SS14 1N5819 SMA

SMD SS14 (DO-214AC) is the surface-mount version of the 1N5819. Design for automated PCB assembly and compact electronic devices, offering space savings and compatibility with modern high-density circuit layouts.

These packaging options allow designers to select the most appropriate form factor based on power requirements, board space, and manufacturing methods.

Manufacturer Details

Produced by major semiconductor manufacturers including:

Vishay

Microsemi

Diodes Inc.

Onsemi

Panjit

STMicroelectronics

Schottky 1N5819 Key Features

The 1N5819 has small conduction losses, which improve overall energy efficiency and reduce wasted power in circuits.

It exhibits negligible switching losses, allowing it to operate efficiently in high-frequency applications without generating excessive heat.

The diode provides extremely fast switching speed, ensuring rapid response in power regulation and protection circuits.

Its low forward voltage drop minimizes energy loss and reduces heat generation during operation.

Additionally, the IN5819 has a specified avalanche capability, providing reliability under transient voltage conditions.

These combined characteristics make the 1N 5819 a reliable and efficient choice for rectification and protection in electronic circuits.

Common Applications of the 1N5819

The diode widely use in circuits that require efficient low-voltage operation and fast switching. Commonly apply in low-voltage, high-frequency inverters, where its fast response and low forward voltage drop improve efficiency.

Also use for freewheeling (flyback) protection in inductive circuits, preventing voltage spikes and protecting other components.

The diode provides reverse polarity protection, ensuring that sensitive electronics are not damaged if the power supply connections are reversed.

Additionally, the IN5819 is suitable for small battery chargers, helping regulate current flow and minimize energy loss.

These applications highlight the diode’s versatility and efficiency in power management and protection circuits.

1N5819 Diode Equivalent and Replacement

If the 1N5819 is unavailable, several Schottky diodes can serve as replacements.

Alternative Diodes to the 1N5819

Model	VRRM (V)	IF(AV) (A)	Package	Manufacturer
SS14	40	1	DO-214AC	Generic
1N5820	20	3	DO-201AD	onsemi
MBRS130	30	1	DO-214AA	onsemi
SR160	60	1	DO-41 / SMA	Generic
1N5819RLG	40	1	DO-41	onsemi
1N5819-E3/54	40	1	DO-41	Vishay
1N5819-TP	40	1	DO-41	MCC
MR817	40	1	DO-41	onsemi
SB140L	40	1	DO-41	Panjit

Tip: Always verify voltage, current, and package compatibility before substituting.

1N5819 Pinout and CAD Model

Pin Configuration

1N5819 Pinout

The 1N 5819 is a two-terminal diode:

Anode — Current enters

Cathode — Current exits (marked with a stripe)

CAD Models

1N5819 circuit

1N5819 CAD Models

How to Test a IN5819 Diode

You can test the diode using a digital multimeter:

Steps

1. Set the multimeter to diode test mode.

2. Place the red probe on the anode and black probe on the cathode.

3. A healthy diode shows approximately 0.15V – 0.45V.

4. Reverse the probes — the reading should show open loop.

Signs of Failure

Reads 0V both directions → shorted diode

Reads open both directions → open diode

1N5819 vs 1N4007

Feature	1N5819	1N4007
Diode Type	Schottky Rectifier	Standard Rectifier
Maximum Reverse Voltage (VRRM)	40 V	1000 V
Average Forward Current (IF(AV))	1 A	1 A
Peak Surge Current (IFSM)	25 – 30 A	30 A
Forward Voltage Drop (VF)	~0.3 - 0.45 V	~0.7 - 1 V
Reverse Recovery Time	Practically zero	~30 µs (slow)
Reverse Leakage Current (IR)	Low, but higher than standard at high temp	Low
Junction Temperature (TJ)	-65°C~+150°C	-65°C~+150°C
Package Options	DO-41, DO-15, SMA	DO-41, SMA
Switching Frequency	High	Low
Efficiency	High (low power loss)	Moderate
Typical Applications	SMPS, DC-DC converters, inverters, battery chargers	AC mains rectification, power supplies, general-purpose rectification
Advantages	Low forward voltage, fast switching	High voltage rating, robust
Limitations	Lower voltage rating, higher leakage at high temperature	Slower switching, higher forward voltage drop

The 1N5819 is a Schottky diode available in DO-41, DO-15, and SMA packages. Designed for low-voltage, high-efficiency applications, with a maximum reverse voltage of 40V, forward current of 1A, low forward voltage drop (~0.3V), and extremely fast switching speed.

The 1N4007 is a standard rectifier diode also available in DO-41 and SMA packages. Designed for general-purpose AC and DC rectification, with a much higher maximum reverse voltage of 1000V, forward current of 1A, higher forward voltage drop (~0.7–1V), and slower switching speed.

Summary:
Use 1N 5819 for high-efficiency, fast switching circuits.
Use 1N4007 for high-voltage rectification.

1N5819 Diode Datasheet PDF

These PDF datasheets include detailed information like ratings, forward voltage curves, thermal limits, and pin configurations.

Frequently Asked Questions [FAQ]

What happens if I exceed the maximum reverse voltage of 40V?

Exceeding 40V can cause avalanche breakdown in the diode, leading to overheating, permanent damage, or failure. Continuous overvoltage reduces reliability and may destroy the diode, so always operate below the specified maximum reverse voltage.

What are good surface-mount alternatives to the 1N5819?

Common surface-mount alternatives include the SS14, MBRS130, and SMA-package Schottky diodes. They offer similar voltage and current ratings, low forward voltage drop, and fast switching speed, making them suitable replacements in compact or automated PCB designs.

Can I use 1N5819 in AC applications?

Yes, can use for low-voltage AC rectification, such as in small power supplies. It is not suitable for high-voltage AC mains applications because its 40V maximum reverse voltage limitation.

What is the maximum current the 1N5819 can handle safely?

The 1N 5819 is rated for 1A average forward current continuously. It can handle short surge currents up to approximately 25-30A. Operating above 1A continuously requires proper thermal management to prevent overheating and failure.

How can I tell if my 1N5819 is damaged?

A damaged 1N 5819 show shorted or open readings with a multimeter in diode test mode. Visible cracks, burn marks, or overheating signs on the diode body also indicate failure. Functional tests in the circuit can confirm abnormal behavior.

Can I use multiple 1N5819 diodes in parallel for higher current?

Yes, can multiple diodes connect in parallel to increase current capacity. However, uneven current sharing may occur because slight forward voltage differences. Using a single higher-current Schottky diode is generally more reliable.

What is the difference between 1N5819 and 1N4148?

The 1N 5819 is a power Schottky diode with low forward voltage drop and fast switching, suitable for rectification and protection. The 1N4148 is a small-signal switching diode, designed for low-current, high-speed signal applications.

What is the use of 1N5819 diode?

The diode use for efficient rectification in low-voltage circuits, reverse polarity protection, freewheeling in inductive loads, and switching power supplies. Its low forward voltage and fast switching improve efficiency and protect electronic components.

What is equivalent to 1N5819?

Equivalents include SS14, MBRS130, SR160, 1N5819RLG, 1N5819-E3/54, MR817, SB140L, and other Schottky diodes with similar voltage, current ratings, low forward voltage drop, and fast switching capabilities.

Conclusion

The 1N5819 Schottky diode is a high-efficiency, fast-switching rectifier designed for modern low-voltage electronics. Its low forward voltage, minimal power loss, and rapid switching performance make it a preferred solution for power supplies, converters, and protection circuits.

Whether you are designing battery-powered devices, DC-DC converters, or protective circuits, the IN5819 provides a reliable and efficient solution.

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