Blog  /  1n4003 Diode : Quick Guide to its Features and More!

1n4003 Diode : Quick Guide to its Features and More!

A diode is a virtual electronic device usually found in circuits. It only permits the current to flow in one way. By doing this, diodes act as current flow regulators. There are very many types of diodes, each with different specifications. In this article, we cover the 1n4003 Diode in further detail. We discuss its characteristics, pin configuration, and also its application.


  • 1n4003 Diode Pinout


Like all diodes, the 1n4003 has two pins. These pins are the anode and the cathode. Distinguishingly, the positive side of the Diode is the anode, while the negative side is the cathode.

Additionally, on the Diode's body, you'll find a silver band mark that represents the side of the cathode terminal.


a diode representation logo with a cathode band

(a diode representation logo with a cathode band.)


  • What is the 1n4003 Diode?


1N4003 belongs to the 1n400x family of rectifier diodes. We use this series of one-ampere diodes as general-purpose usage diodes and current regulators in AC adapters for household appliances. Also, you can use these series of diodes in electronic devices for current rectification, voltage boosting, and voltage breakdowns.

However, the 1n4003 Diode cannot switch applications since it is relatively low.

Furthermore, the former has higher current ratings when comparing the rectifier diodes to the signal diodes.

Additionally, it has a greater typical junction capacitance.

Importantly, for a 1N4003 Diode, 1A is its maximum current carrying capacity. However, it is built to tolerate a voltage surge of up to 30A. Therefore, you use it in electronic circuits that can handle a power supply of less than 1A. Further, it has a negligible reverse current of 5uA. With these properties, the 1n4003 Diode can hold out a  reverse voltage surge peak that goes out to 200V.


an electronic computer motherboard with electronic components

(an electronic computer motherboard with electronic components. )


  • Features of the 1n4003 Diode.


The essential technical specifications of the 1n4003 rectifier diode are listed below;

  • It is an axial-lead rectifier made diode type available in DO-41 & SMD packages package type.
  • Secondly, the Diode has a maximum peak repetitive reverse voltage of 200v.
  • Moreover, these axial-lead diodes have a reverse current of 5uA with a maximum forward voltage = 1.0 Amp.
  • Also, it has a non-repetitive max fwd current of 30A and a 100v maximum RMS voltage.
  • Additionally, it has max storage and operating temperature of around -55 degrees to 175 degrees centigrade.
  • Lastly, the Diode offers a continuous current with a max power dissipation of 3W.


a photo of a vector diode symbol

(a photo of a vector diode symbol.)


  • in4003 Equivalent Diodes.


Diodes in the 1n400x series can supplement and complement the 1n4003 diode. Notable alternative diode examples the 1n4002, 1n4004, 1n4005, 1n4006, and 1n4007.

On the other hand, we can substitute the IN4003 Diode with the 1n5408, 1n4733A, 1N4148, 1N5822, and the Zener diodes.


Zener diodes shown in a picture

(Zener diodes shown in a picture.)


  • How to use the in4003 Diode?


The 1n4003 rectifier diode is a very common power diode. Its primary function is reverse voltage protection, especially in DC input circuits. Also, you can find this Diode in many power applications such as DC converters components.


  • Application of in4003 Diode.


Listed below are some of the advantages and power applications of the 1n4003 axial-leaded devices.

  • Firstly, it has a low forward voltage drop. Therefore, it can prevent a reverse polarity problem.
  • Secondly, it has a high forward surge current capability essential for half-wave and full-wave rectifiers.
  • In addition, it has a low reverse leakage hence perfect for current flow regulators since it offers reverse voltage protection.
  • Also, the Diode has a low-cost construction making it a joint protection device.
  • Lastly, the Diode has a high soldering temperature guaranteed, making it easy to use.


Vector diode symbols

(Vector diode symbols)




The 1n4003 rectifier diode is a reliable electronic component for your circuits. Moreover, it has a lot of different applications that can be useful for hobbyists and enthusiasts alike.

Happy building! We hope this article provides you with helpful information about this Diode. We've discussed some of its essential aspects. But, if you want to know more, feel free to reach out with any questions and concerns.