I am looking a replacement of this diode BAV99W Datasheet.I have a confusion about Average Rectified Forward Current,Forward Rectified Output current and Forward Continuous Current ratings.What is a difference between all this terms,because in this datasheet I got Forward continuous current ratings but there is no Average Rectified Forward Current or Forward Rectified Output current ratings.

While I found this diode 1N4007 Datasheet it have Average Rectified Forward Current rating and this one BAV99W Datasheet have both Forward continuous current and Average Rectified Output current ratings.

up vote 1 down vote accepted

Average current rating is less than the continuous rating because the diode forward voltage changes with current, and dissipation is higher at higher current, so for a presumed sinusoidal waveform the dissipation will be higher than for the same average DC current.

So if you are passing DC through the diode, you use the continuous rating. If you are using it as a rectifier you use the average rating.

Note that those BAV99 ratings are given at an ambient temperature of 25°C so for any practical application you're going to be limited to much less than those ratings. You have to dig into the mounting, the junction-to-ambient thermal resistance and consider the heating from both diodes if applicable.

The 1N400x is rated 1A average at Ta = 75°C so it may be a practically useful rating, depending in the application.

There are other major differences- while both could be used for mains frequency rectifier applications, the 1N400x is far more rugged, but very, very slow, causing more hash (EMI) and making it useless for higher frequency applications.

  • But for 1N400x there is not Forward continuous current rating given – ARYA1992 Sep 14 at 16:02
  • It's at least the average, so you can use that number. If you need more than 1A DC you can use 1N540x. – Spehro Pefhany Sep 14 at 16:58

Your Answer

 

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.