1N4004 1 A 400 V General-Purpose Rectifier Diode

1N4004 is a 1 A, 400 V general-purpose rectifier diode in an axial through-hole package. It is used for general-purpose power rectification in circuits designed for its voltage, current and thermal limits.

Key specifications

Typical applications

• 50/60 Hz AC-to-DC rectification
• Low-frequency power supply repair
• Polarity protection in circuits designed for its forward-voltage drop

Selection notes

The reverse-voltage rating is a blocking limit, not a regulated output voltage. Check forward-voltage loss, surge current, ambient temperature, mounting and load waveform. Apply the manufacturer's thermal derating; do not assume the headline current is available under every mounting condition.

Frequently asked questions

What is 1N4004?

1N4004 is a general-purpose rectifier diode rated for 1 A average forward current and 400 V repetitive peak reverse voltage under its datasheet conditions.

Is 1N4004 a fast-recovery or Schottky diode?

No. It is a standard general-purpose silicon rectifier. High-frequency switching circuits may require a fast-recovery, ultrafast or Schottky device instead.

Which end of 1N4004 is the cathode?

The banded end is the cathode. The opposite end is the anode. Match the orientation to the PCB marking or schematic.

Can 1N4004 replace another diode?

Check the full part number, reverse voltage, average and surge current, recovery behaviour, package and thermal limits before substitution. Matching only the physical size is insufficient.

Buying from Anu Electronics

Sold by Anu Electronics, Chennai, India. For BOM enquiries, bulk quantities or confirmation of the supplied manufacturer's datasheet, contact info@anuelectronics.com and quote 1N4004.

Technical reference

1N4004 reference datasheet / manufacturer product information. The linked document is a specification reference; confirm the supplied manufacturer's datasheet for design qualification.

Product image is an AI-generated illustration. Actual body markings and appearance may vary.