1N2071 diode speed
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||||||||||||||||||||
|
Posted by on July 8, 2008, 2:09 am
Please log in for more thread options an obsolete diode - Mouser doesn't carry it anymore. I looked up the datasheet for the 1N2071. It seems designed to operate at 60 Hz, but didn't find any info on the maximum speed for how quickly the diode can operate. http://www.alldatasheet.com/datasheet-pdf/pdf/102157/IRF/1N2071.html Can the diode successfully operate at up to 10 kHz? I have a sinking feeling the answer is "no". So, how quickly CAN the diodes reliably switch? 100 Hz? 400 Hz? Any ideas? Thanks, Michael | |||||||||||||||||||||||||||||||
|
Posted by John Popelish on July 8, 2008, 2:40 am
Please log in for more thread options Since the data sheet specifies no reverse recovery time, it is going to be pretty slow, probably up to several microseconds, depending on how high the forward current is just before the voltage reverses. You could set up a test and measure it under some particular condition. Often, the reverse recovery time is measured right after the diode has been conducting something like its rated forward current, with the reverse current limited to somewhere between double that current to perhaps half it and a specified rate of change of current as it swings from forward to reverse. And the time it takes for the reverse current to fall to something like 1/4 or 1/10th of the peak value is measured. It doesn't take a very complicated test setup to do this. See explanation of reverse recovery specs: http://www.microsemi.com/micnotes/302.pdf MIL-STD-750, Method 4031 for testing reverse recovery starting at page 100 of: http://snebulos.mit.edu/projects/reference/MIL-STD/MIL-STD-750D-Notice2.pdf There was a time when the test setup was shown on every fast recovery diode data sheet. -- Regards, John Popelish | |||||||||||||||||||||||||||||||
|
Posted by on July 8, 2008, 11:09 pm
Please log in for more thread options > mrdarr...@gmail.com wrote:
> > I found four 1N2071 diodes in my junk pile. Apparently the 1N2071 is
> > an obsolete diode - Mouser doesn't carry it anymore. >
> > I looked up the datasheet for the 1N2071. It seems designed to
> > operate at 60 Hz, but didn't find any info on the maximum speed for > > how quickly the diode can operate. >
> >http://www.alldatasheet.com/datasheet-pdf/pdf/102157/IRF/1N2071.html
>
> > Can the diode successfully operate at up to 10 kHz? I have a sinking
> > feeling the answer is "no". >
> > So, how quickly CAN the diodes reliably switch? 100 Hz? 400 Hz?
>
> > Any ideas?
>
specs:http://www.microsemi.com/micnotes/302.pdf
> Since the data sheet specifies no reverse recovery time, it > is going to be pretty slow, probably up to several > microseconds, depending on how high the forward current is > just before the voltage reverses. > > You could set up a test and measure it under some particular > condition. Often, the reverse recovery time is measured > right after the diode has been conducting something like its > rated forward current, with the reverse current limited to > somewhere between double that current to perhaps half it and > a specified rate of change of current as it swings from > forward to reverse. And the time it takes for the reverse > current to fall to something like 1/4 or 1/10th of the peak > value is measured. It doesn't take a very complicated test > setup to do this. > > See explanation of reverse recovery > MIL-STD-750, Method 4031 for testing reverse recovery
of:http://snebulos.mit.edu/projects/reference/MIL-STD/MIL-STD-750D-Notic...
> starting at page 100 >
> There was a time when the test setup was shown on every fast > recovery diode data sheet. > > -- > Regards, > > John Popelish Ok, thanks! Michael | |||||||||||||||||||||||||||||||
|
Posted by Eeyore on July 8, 2008, 8:48 am
Please log in for more thread options
mrdarrett@gmail.com wrote: > I found four 1N2071 diodes in my junk pile. Apparently the 1N2071 is
> an obsolete diode - Mouser doesn't carry it anymore. > > I looked up the datasheet for the 1N2071. It seems designed to > operate at 60 Hz, but didn't find any info on the maximum speed for > how quickly the diode can operate. > > http://www.alldatasheet.com/datasheet-pdf/pdf/102157/IRF/1N2071.html > > Can the diode successfully operate at up to 10 kHz? I have a sinking > feeling the answer is "no". > > So, how quickly CAN the diodes reliably switch? 100 Hz? 400 Hz? Any diode designed for AC line power switching is probably good for 400Hz but don't bet on anything much above that. What fun I've had with Chinese outfits fitting 1N4004s where I'd specified UF4004s ! I imagine the remedy is not to use a part with the number 4004 in it lest they try and get clever and specify a BYxx something or other. Graham | |||||||||||||||||||||||||||||||
|
Posted by Michael Black on July 8, 2008, 11:25 am
Please log in for more thread options On Mon, 7 Jul 2008, mrdarrett@gmail.com wrote:
> I found four 1N2071 diodes in my junk pile. Apparently the 1N2071 is
> an obsolete diode - Mouser doesn't carry it anymore. > > I looked up the datasheet for the 1N2071. It seems designed to > operate at 60 Hz, but didn't find any info on the maximum speed for > how quickly the diode can operate. > > http://www.alldatasheet.com/datasheet-pdf/pdf/102157/IRF/1N2071.html > > Can the diode successfully operate at up to 10 kHz? I have a sinking > feeling the answer is "no". > > So, how quickly CAN the diodes reliably switch? 100 Hz? 400 Hz? > What are you trying to do? You say "switch" which implies some sort of logic or switching supply, but it's not completely obvious. What you need a diode for helps to determine what will be suitable. Since you're pulling things out of the junkbox, why not find a junk computer, open up the power supply, and use the schottky power diodes on the secondary for this project? They are readily available, and since they are in switching supplies, they will be good at higher frequencies. Michael > Any ideas?
> > Thanks, > > Michael > | |||||||||||||||||||||||||||||||
| Similar Threads | Posted |
| 1N2071 diode speed | July 8, 2008, 2:09 am |
| How to make speed of DC motor match speed of another? | June 11, 2006, 5:18 pm |
| Re: Tired of Rod Speed? Read the Rod Speed FAQ... | November 22, 2008, 11:54 am |
| Speed | March 10, 2006, 6:47 am |
| speed controller | January 28, 2006, 4:28 am |
| Speed control | May 28, 2006, 2:21 pm |
| Calculate speed when skiing? | October 3, 2004, 1:56 pm |
| Thermaltake rotation's speed fan | January 29, 2005, 4:11 pm |
| 10 bits high speed ADC | March 20, 2005, 8:59 pm |
| Please Help!!!! LM2907 Speed Switch | October 28, 2005, 6:02 am |
| most appropriate high speed interface | January 11, 2006, 4:12 pm |
| DC motor speed controller necessary? | August 16, 2006, 1:29 am |
| Calculate the speed of an object | September 19, 2006, 7:22 pm |
| relay switching speed | August 22, 2008, 1:46 pm |
| DC motor speed control | August 26, 2008, 3:25 am |
> an obsolete diode - Mouser doesn't carry it anymore.
>
> I looked up the datasheet for the 1N2071. It seems designed to
> operate at 60 Hz, but didn't find any info on the maximum speed for
> how quickly the diode can operate.
>
> http://www.alldatasheet.com/datasheet-pdf/pdf/102157/IRF/1N2071.html
>
> Can the diode successfully operate at up to 10 kHz? I have a sinking
> feeling the answer is "no".
>
> So, how quickly CAN the diodes reliably switch? 100 Hz? 400 Hz?
>
> Any ideas?