On Tuesday 10 January 2006 17:52, Tinco Brouwer wrote: > [EMAIL PROTECTED] wrote: > > > > > What's a good diode to put across the solenoid of a 12V, 100mA relay? > > We have some boards that currently use the venerable 1N4148 for this > > purpose. Although the 1N4148 is a high-speed diode, I don't think it > > is intended for this application. I need to look for an alternative, > > preferably in a surface-mount package. Certain requirements with > > creepage and clearances are forcing me to put some components on the > > solder side of the board. > > > > Tony > > As Pieter said, the 1N4148 is often used for this purpose. > > However, the 1N4448 is as old as the 1N4148 but with a much better > forward voltage.
No offence intended, but i think that the forward voltage of the diode is not really relevant for the application as described.. A lower forward voltage will result is a slightly slower dampening of the relay coil's current, but the current will probably be 'gone' much faster than the mechanics of the relay can react anyway. > For <1V voltage drop the 1N4148 can pass 10 mA, the 1N4448 100 mA. Other > spec's are identical. > > For SMD, it depends on what case is preferred. > > Regards, Tinco Brouwer. > -- Author: p.r. faasse INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
