Post by thread:[ot] Need low power comparator in SOT-23-5 package

Hi All: Just ran into a snafu with one of our pic based loggers--had specified a National LMC7225IM micro-power comparator (open drain output) in a SOT-23-5 package, and all my normal vendors are saying buy a reel of 1000 and wait 8-12 weeks. I need TWENTY as soon as I can get them--or a pin for pin equivalent--or another solution to drop into the existing hardware for low battery detection. I had tried a Telcom TC54VN (a three pin 2.7 volt voltage detector), but the input impedance is way too low--I need to run 100uA though the input divider just to keep the thing from oscillating--and this almost triples my overall power draw for the whole logger. Key requirements are: really low power, SOT-23-5 compatible or easily kludgeable in the available space--and no re-design of the PCB's. Input is 6 to 15 volts DC, with the desired trip point at 6.1 volts. Open drain output is not mandatory. Anyone have any ideas? Thanks Kelly William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems <spam_OUTborsumTakeThisOuTdascor.com> & <http://www.dascor.com>San Diego, California, USA

At 21:18 15/10/99 -0700, you wrote: {Quote hidden}>Hi All: > >Just ran into a snafu with one of our pic based loggers--had specified a >National LMC7225IM micro-power comparator (open drain output) in a SOT-23-5 >package, and all my normal vendors are saying buy a reel of 1000 and wait >8-12 weeks. I need TWENTY as soon as I can get them--or a pin for pin >equivalent--or another solution to drop into the existing hardware for low >battery detection. > >I had tried a Telcom TC54VN (a three pin 2.7 volt voltage detector), but >the input impedance is way too low--I need to run 100uA though the input >divider just to keep the thing from oscillating--and this almost triples my >overall power draw for the whole logger. > >Key requirements are: really low power, SOT-23-5 compatible or easily >kludgeable in the available space--and no re-design of the PCB's. Input is >6 to 15 volts DC, with the desired trip point at 6.1 volts. Open drain >output is not mandatory. > >Anyone have any ideas? > >Thanks >Kelly > > > >William K. Borsum, P.E. -- OEM Dataloggers and Instrumentation Systems ><.....borsumKILLspam@spam@dascor.com> & <http://www.dascor.com>San Diego, California, USA > > Low power comps eh, Well both you and Andy can take a look at the Sieko ones SOT 23 package. Nominaly used for reset control, but are just a comp nothing else (Needs a Cap for reset control) Simple and CHEAP! Dennis