Diotec standard 1a axial rectifier diodes 1n400x series diotec 1 n 4004 this rectifier diode is from a range of the most popular standard 1a axial rectifier diodes and has a vrrm of 400v a fast switching time makes this device suitable for a wide range of applications such as rectification and overcurrent protection in switch mode power supplies diotec 1n4004 rectifier diode 1a 400v