1N4148: Overview,Specifications,Main uses,Features,application fields,working principle and alternative models


1N4148 Diode Overview:

The 1N4148 is a popular general-purpose switching diode commonly used in various electronic circuits. It is a small signal diode that is widely available and has a broad range of applications.


  • Type: Small signal diode
  • Package: DO-35 (Glass Axial)
  • Reverse Voltage: 100V
  • Forward Current: 300mA
  • Forward Voltage Drop: ~0.7V
  • Reverse Recovery Time: ~4ns
  • Power Dissipation: 500mW
  • DataSheet

    1N4148 PDF

Main Uses:

1N4148 diodes are used in a wide range of applications, including:

  • Signal rectification
  • High-speed switching
  • Clipping and clamping circuits
  • Protection circuits
  • Voltage/current regulation circuits


  • Fast switching speed
  • Small form factor
  • Low forward voltage drop
  • High voltage capability
  • Low reverse leakage current

Application Fields:

The 1N4148 diode finds applications in various fields, including:

  • Consumer electronics
  • Power supplies
  • Communication systems
  • Automotive electronics
  • Industrial electronics
  • Lighting systems

Working Principle:

The 1N4148 diode operates based on the principle of unidirectional current flow. When forward biased, it conducts current with a low forward voltage drop. When reverse biased, it blocks current flow until the reverse breakdown voltage is reached.

Alternative Models:

  • 1N4448: This is an alternative with similar characteristics but with slightly different specifications.
  • 1N914: The 1N914 is another alternative that is electrically equivalent to the 1N4148.

These diodes are interchangeable in many applications, but it's essential to check their specific datasheets for detailed specifications before substitution.


Always refer to the datasheet of the specific diode model you are working with for precise details on performance, characteristics, and limitations.