Post by thread:[PICLIST] Low Current Voltage Regulator -- where t

I'm looking for a 5 volt regulator that draws very little current when there is no load. Mouser Electronics has a Seiko part (S-81250SGY) in a TO-92 package that looks like it would be just about perfect (1.2 uA and only ~60 cents) but they won't have any available until at least the end of April. Does anyone know of either an alternative source for this part or an alternative part that is actually shipping? (I'm looking for a thru-hole part.) Thanks! John Hansen -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

Check the distributors / reps that carry Seiko. Also, Telcom (or is it Telecom??) makes some comparable regulators, though I believe the current draw on the Seiko is the lowest. Did you try using Partminer to search for stock? Scott F. Touchton 1550 Engineering Manager JDS Uniphase John Hansen <hansen@FREDON To: spam_OUTPICLISTTakeThisOuTMITVMA.MIT.EDU IA.EDU> cc: Sent by: pic Subject: Low Current Voltage Regulator -- where to get them? microcontrolle r discussion list <PICLIST@MITVM A.MIT.EDU> 01/04/02 11:07 AM Please respond to pic microcontrolle r discussion list I'm looking for a 5 volt regulator that draws very little current when there is no load. Mouser Electronics has a Seiko part (S-81250SGY) in a TO-92 package that looks like it would be just about perfect (1.2 uA and only ~60 cents) but they won't have any available until at least the end of April. Does anyone know of either an alternative source for this part or an alternative part that is actually shipping? (I'm looking for a thru-hole part.) Thanks! John Hansen -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

John Hansen wrote: > > I'm looking for a 5 volt regulator that draws very little current when > there is no load. Mouser Electronics has a Seiko part (S-81250SGY) in a > TO-92 package that looks like it would be just about perfect (1.2 uA and > only ~60 cents) but they won't have any available until at least the end of > April. Does anyone know of either an alternative source for this part or > an alternative part that is actually shipping? (I'm looking for a > thru-hole part.) If you are willing to build it discrete (couple of transistors, inductor) it might be possible to adapt this 2-transistor SMPS regulator, it will give better efficiency when running and should be adaptable to very low power "standby" when there is no load. The circuit is already designed to have everything off when there is no load, with the exception of one resistor and zener which is used as a voltage reference. Changing this part of the circuit slightly will give standby under 2uA. Of course if you don't need efficiency when running it may not be worth the complexity of even a simple SMPS regulator. -Roman Here's the 2-tran SMPS 5v regulator: http://centauri.ezy.net.au/~fastvid/smps.htm -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

(sorry! fixed topic tag) John Hansen wrote: > > I'm looking for a 5 volt regulator that draws very little current when > there is no load. Mouser Electronics has a Seiko part (S-81250SGY) in a > TO-92 package that looks like it would be just about perfect (1.2 uA and > only ~60 cents) but they won't have any available until at least the end of > April. Does anyone know of either an alternative source for this part or > an alternative part that is actually shipping? (I'm looking for a > thru-hole part.) If you are willing to build it discrete (couple of transistors, inductor) it might be possible to adapt this 2-transistor SMPS regulator, it will give better efficiency when running and should be adaptable to very low power "standby" when there is no load. The circuit is already designed to have everything off when there is no load, with the exception of one resistor and zener which is used as a voltage reference. Changing this part of the circuit slightly will give standby under 2uA. Of course if you don't need efficiency when running it may not be worth the complexity of even a simple SMPS regulator. -Roman Here's the 2-tran SMPS 5v regulator: http://centauri.ezy.net.au/~fastvid/smps.htm -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

John Hansen wrote: > > I'm looking for a 5 volt regulator that draws very little current when > there is no load. Mouser Electronics has a Seiko part (S-81250SGY) in a > TO-92 package that looks like it would be just about perfect (1.2 uA and > only ~60 cents) but they won't have any available until at least the end of > April. Does anyone know of either an alternative source for this part or > an alternative part that is actually shipping? (I'm looking for a > thru-hole part.) Microchip bought Telcom Semi - I have used the TC-55 series low drop-out regulators with good results. Check the Microchip web site and get samples from the same folks who give you PIC samples. dwayne Dwayne Reid <.....dwaynerKILLspam.....planet.eon.net> Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 17 years of Engineering Innovation (1984 - 2001) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: To leave the PICList EraseMEpiclist-unsubscribe-requestspam_OUTTakeThisOuTmitvma.mit.edu