Bridge Rectifier Question

sam9 · 15th October 2004, 09:59 PM

When selecting a 25A or 35A bridge rectifier there is the option of various Peak Reverse Voltage ratings. Beyond a minimum sufficient rating (400V or 600V), is there any disadvantage other than price for selecting a still higher rating? I.e., if there is no difference in price why not just use the version with a 1000V PRV rating?

Stocker · 15th October 2004, 10:11 PM

The answer IS price, for most commercial kit. If you plan to move 100,000 units, a dollar or three is a big lump of cash.

jneutron · 15th October 2004, 10:57 PM

Diodes are manufactured in mass quantities. They will be designed to make some ele specs. Speed, leakage, voltage reverse, voltage forward.

Once they are manufactured and passivated, they are tested and sorted by how they perform..in your example, the 1Kv devices may actually have been the same diffusion run as the 200 volters.

Since they can command a premium price for the higher volt devices, they do so..

For the most part, you will find that the higher voltage devices probably have the same forward spec, just higher reverse capability.

Most applications will not suffer as a result of the higher voltage devices, unless the bvr of the diode is used to protect a delicate transistor from reverse transients.

Cheers, John

sam9 · 16th October 2004, 02:03 AM

Confirms what I suspected.

15th October 2004, 09:59 PM	#1
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Bridge Rectifier Question When selecting a 25A or 35A bridge rectifier there is the option of various Peak Reverse Voltage ratings. Beyond a minimum sufficient rating (400V or 600V), is there any disadvantage other than price for selecting a still higher rating? I.e., if there is no difference in price why not just use the version with a 1000V PRV rating?

15th October 2004, 10:11 PM	#2
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	The answer IS price, for most commercial kit. If you plan to move 100,000 units, a dollar or three is a big lump of cash. __________________ Jesus loves you.

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15th October 2004, 10:57 PM	#3
jneutron diyAudio Member Join Date: Jan 2004 Location: away	Diodes are manufactured in mass quantities. They will be designed to make some ele specs. Speed, leakage, voltage reverse, voltage forward. Once they are manufactured and passivated, they are tested and sorted by how they perform..in your example, the 1Kv devices may actually have been the same diffusion run as the 200 volters. Since they can command a premium price for the higher volt devices, they do so.. For the most part, you will find that the higher voltage devices probably have the same forward spec, just higher reverse capability. Most applications will not suffer as a result of the higher voltage devices, unless the bvr of the diode is used to protect a delicate transistor from reverse transients. Cheers, John

16th October 2004, 02:03 AM	#4
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Confirms what I suspected.

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